{"id":6290,"date":"2025-12-21T18:05:29","date_gmt":"2025-12-22T02:05:29","guid":{"rendered":"https:\/\/3waycatalyst.com\/?p=6290"},"modified":"2025-12-21T18:05:44","modified_gmt":"2025-12-22T02:05:44","slug":"three-way-catalytic-converter-vs-doc","status":"publish","type":"post","link":"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-vs-doc\/","title":{"rendered":"Trostruki kataliti\u010dki konverter u odnosu na DOC: 7 savjeta za vrhunske performanse"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"introduction\">Uvod<\/h2>\n\n\n\n<p>Moderna kontrola industrijskih emisija oslanja se na sofisticirani hemijski in\u017eenjering. Globalni napor za neutralnost ugljika pokre\u0107e evoluciju sistema za naknadnu obradu ispu\u0161nih plinova. Dvije tehnologije predvode ovu oblast: katalizator oksidacije dizela (DOC) i\u00a0<a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\"><strong>trosmjerni katalizator<\/strong>\u00a0(TWC)<\/a>Svaki od njih ima posebnu ulogu zasnovanu na hemiji sagorijevanja motora. DOC tradicionalno dominira sektorom dizela. Me\u0111utim,<a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">\u00a0<strong>trosmjerni katalizator<\/strong><\/a>\u00a0ostaje standard za benzinske motore.<\/p>\n\n\n\n<p>Nedavne promjene u sastavu goriva, poput porasta upotrebe biodizela B100, dovode u pitanje ove tradicionalne granice. In\u017eenjeri sada ponovo procjenjuju kako ovi katalizatori funkcioni\u0161u u ekstremnim uslovima. Biogoriva visoke koncentracije mijenjaju temperaturu izduvnih gasova i hemijski sastav. Ovaj \u010dlanak pru\u017ea iscrpnu komparaciju DOC-a i <a href=\"http:\/\/Noted that, you are an experienced SEOer in three way catalytic converter, I need you to rewrite my article with different words but in same maning in 2500 words to 7500 words, And here are my detailed requirements as below:  1. The title of the rewrite article should be same or similar to my article strictly, and the title should be in 60 letters.  2. You should add extra 1 or 2 paragraph with the subtitle into the rewrite article which can make the new article more readable.  3. Please add a table or sheet or two to your article to compare data or list types, but this is not necessary.  4. The rewrite article must be in the style of scientific and technological explanatory writing or argumentative writing, using more short sentences and avoiding the appearance of overly long sentence.  5. The rewite article should use active voice instead of passive voice for declarative sentences!  6. The rewrite article,should focus on those kewwords.three way catalytic converter  7. l need the introduction at the beginning of the rewite aricle, the concluion at the end.And give me the seo-friendly meta description after you finish the new article.  8. I need you list some outer links which l can insert to the rewrite article.  My article:  TWC vs DOC: Oxidation Performance Comparison  The main difference in oxidation performance is that a Diesel Oxidation Catalyst (DOC) excels at oxidizing HC, CO, and PM organic fraction in lean diesel exhaust, while a Three-Way Catalyst (TWC) handles near-stoichiometric conditions to reduce NOx, CO, and HC simultaneously, making it superior for gasoline engines but less effective for methane in diesel; however, with increased catalyst volume\/PGM loading, even TWCs can significantly boost low-temperature DOC performance for challenging fuels like B100.  Diesel Oxidation Catalyst (DOC) Performance Strengths: Highly effective at high temperatures for oxidizing CO, Hydrocarbons (HC), and diesel particulate matter (PM) organic fraction (OF) in lean exhaust, reducing odor. Weaknesses: Poor methane (CH4) conversion (often <30%) and no NOx reduction capability; requires higher temperatures to light-off. Best For: Diesel engines, reducing PM and HC\/CO, especially with higher sulfur or renewable fuels (HVO, B100), where it can be optimized.  Three-Way Catalyst (TWC) Performance Strengths: Simultaneously oxidizes CO\/HC and reduces NOx under stoichiometric (near-stoichiometric) conditions, crucial for gasoline engines. Weaknesses: Requires precise air-fuel ratios (stoichiometric); struggles with lean-burn conditions typical of diesel, especially with methane. Application: Dominant for gasoline engines but can be adapted for diesel by increasing catalyst volume or PGM loading, significantly improving low-temp HC\/CO oxidation and performance with alternative fuels like B100.  Key Comparison Points Fuel Type: DOC for diesel (lean), TWC for gasoline (stoichiometric). Pollutants: DOC targets HC, CO, PM; TWC targets HC, CO, &amp; NOx. Methane: DOC is very poor; TWC needs specific conditions (like lean-rich cycling) to handle it better but still struggles with high CH4. Optimization: For challenging diesel applications (e.g., high % biofuel), adding a TWC or increasing PGM\/volume of a DOC greatly improves low-temperature oxidation and overall efficiency.  In essence, a DOC is a simpler oxidation catalyst for diesel, while a TWC offers more complex, multi-pollutant control but requires specific operating conditions, though it can be enhanced to significantly boost diesel oxidation performance where needed.   Do not perform any procedure until you read this information and you understand this information. The Caterpillar catalytic converter is designed to convert carbon monoxide, hydrocarbons, and aldehydes into carbon dioxide and water. The equations in Table 1 are the unbalanced chemical reactions. Substrate \u2013 typically a grid or honeycomb structure that directs exhaust flow and provides a surface area for a catalyst to be supported. Conversion efficiency - The ratio of a system's emission output that is compared to the system's emission input Catalyst - A catalyst is a substance that accelerates a chemical reaction without being affected by the reaction. The Cat Retrofit TWC (three-way converter) and OC (Oxidation Catalyst) are designed for spark-ignited engines, gas engines. The DOC (Diesel Oxidation Catalyst) is designed for compression ignition or diesel engines. They all feature a high-performance, durable catalyst formulation. The catalyst is supported on a ceramic honeycomb substrate and housed within a stainless steel enclosure. This proprietary catalyst technology is available in either stand-alone converter or converter\/muffler combination. Overview The catalysts can be built into standard units, with end housings to transition to the exhaust pipe, or built inside a replacement muffler system. It is easily installed in the exhaust system by using standard clamps. In general, clamped units are shipped assembled. If a unit is to be unclamped for any reason, reinstall as shown in the exploded view above. Tighten bolts to 200 in-lbs. Care must be used in handling the graphite gaskets. These gaskets are extremely fragile. Any deformation or cracking renders the gasket unusable and it must be replaced. Contact your Cat Dealer for replacement gaskets. If a stock muffler is to be used in conjunction with the Cat TWC, the Cat TWC must be installed in front (engine side) of the muffler  Prior study with biodiesel and its blends with ultra-low sulfur diesel (ULSD) and renewable diesel (RD) showed that a commercial diesel oxidation catalyst (DOC) is unable to effectively oxidize neat biodiesel (B100) or high-level biodiesel blends injected into the exhaust of a diesel engine at challenging conditions of low temperature, high exhaust flow rate and high dosing rate. In steady-state performance tests, the performance of blends up to B50 in ULSD or RD was nearly equivalent to ULSD at the lowest exhaust flow rate or for exhaust temperature over 340 degrees C for medium and high flows. ULSD blends above 50 vol% biodiesel exhibited reduced thermal efficiency and DOC outlet temperature with increasing dosing rate and required exhaust temperatures over 400 degrees C to achieve similar performance as ULSD. For RD blends at higher flow rates and temperatures below 300 degrees C even B10 blends showed some loss in performance at the highest dosing rates. Data showed an increase in lightoff temperature with an increase in biodiesel concentration in both the ULSD and RD blends. Here we conducted a limited study with higher catalyst volume and increased platinum group metal (PGM) loading to see if these factors would improve DOC performance with B100. ULSD, RD and B100 were run on steady-state performance test with the same DOC used previously. To assess the impact of PGM loading and catalyst volume we also used a three-way catalyst (TWC) for comparison to the DOC. The TWC consisted of two bricks and the test was run with one and both bricks to assess the impact of catalyst volume. The data showed that the single brick of TWC was marginally better than the DOC with better light off performance for B100 at low temperatures and exhaust flow rates. The entire TWC (two bricks) was significantly better than the DOC showing marginally better performance at low temperature and exhaust flow rate and significantly improved performance at low temperature and medium flow rate. The additional catalyst volume and higher overall catalyst loading produced better oxidation of B100 even at the most challenging conditions - with increased catalyst volume (increased residence time) have the largest effect. Original languageAmerican English Number of pages10 StatePublished - 2025 EventWCX SAE World Congress Experience - Detroit, Michigan Duration: 8 Apr 2025 \u2192 10 Apr 2025 Conference ConferenceWCX SAE World Congress Experience CityDetroit, Michigan Period8\/04\/25 \u2192 10\/04\/25 NLR Publication Number NREL\/CP-2A00-95780 Keywords biodieselcatalystsdiesel \/ compression ignition enginesemissions measurementthree-way catalysts\">TWC<\/a> performanse. Analiziramo efikasnost oksidacije, temperature ga\u0161enja i utjecaj optere\u0107enja plemenitim metalima. Ovaj vodi\u010d slu\u017ei kao tehni\u010dka referentna vrijednost za SEO profesionalce i in\u017eenjere za emisije.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"the-core-chemistry-of-the-three-way-catalytic-converter\">Osnovna hemija trostrukog kataliti\u010dkog konvertora<\/h2>\n\n\n\n<p>The<a href=\"http:\/\/Noted that, you are an experienced SEOer in three way catalytic converter, I need you to rewrite my article with different words but in same maning in 2500 words to 7500 words, And here are my detailed requirements as below:  1. The title of the rewrite article should be same or similar to my article strictly, and the title should be in 60 letters.  2. You should add extra 1 or 2 paragraph with the subtitle into the rewrite article which can make the new article more readable.  3. Please add a table or sheet or two to your article to compare data or list types, but this is not necessary.  4. The rewrite article must be in the style of scientific and technological explanatory writing or argumentative writing, using more short sentences and avoiding the appearance of overly long sentence.  5. The rewite article should use active voice instead of passive voice for declarative sentences!  6. The rewrite article,should focus on those kewwords.three way catalytic converter  7. l need the introduction at the beginning of the rewite aricle, the concluion at the end.And give me the seo-friendly meta description after you finish the new article.  8. I need you list some outer links which l can insert to the rewrite article.  My article:  TWC vs DOC: Oxidation Performance Comparison  The main difference in oxidation performance is that a Diesel Oxidation Catalyst (DOC) excels at oxidizing HC, CO, and PM organic fraction in lean diesel exhaust, while a Three-Way Catalyst (TWC) handles near-stoichiometric conditions to reduce NOx, CO, and HC simultaneously, making it superior for gasoline engines but less effective for methane in diesel; however, with increased catalyst volume\/PGM loading, even TWCs can significantly boost low-temperature DOC performance for challenging fuels like B100.  Diesel Oxidation Catalyst (DOC) Performance Strengths: Highly effective at high temperatures for oxidizing CO, Hydrocarbons (HC), and diesel particulate matter (PM) organic fraction (OF) in lean exhaust, reducing odor. Weaknesses: Poor methane (CH4) conversion (often <30%) and no NOx reduction capability; requires higher temperatures to light-off. Best For: Diesel engines, reducing PM and HC\/CO, especially with higher sulfur or renewable fuels (HVO, B100), where it can be optimized.  Three-Way Catalyst (TWC) Performance Strengths: Simultaneously oxidizes CO\/HC and reduces NOx under stoichiometric (near-stoichiometric) conditions, crucial for gasoline engines. Weaknesses: Requires precise air-fuel ratios (stoichiometric); struggles with lean-burn conditions typical of diesel, especially with methane. Application: Dominant for gasoline engines but can be adapted for diesel by increasing catalyst volume or PGM loading, significantly improving low-temp HC\/CO oxidation and performance with alternative fuels like B100.  Key Comparison Points Fuel Type: DOC for diesel (lean), TWC for gasoline (stoichiometric). Pollutants: DOC targets HC, CO, PM; TWC targets HC, CO, &amp; NOx. Methane: DOC is very poor; TWC needs specific conditions (like lean-rich cycling) to handle it better but still struggles with high CH4. Optimization: For challenging diesel applications (e.g., high % biofuel), adding a TWC or increasing PGM\/volume of a DOC greatly improves low-temperature oxidation and overall efficiency.  In essence, a DOC is a simpler oxidation catalyst for diesel, while a TWC offers more complex, multi-pollutant control but requires specific operating conditions, though it can be enhanced to significantly boost diesel oxidation performance where needed.   Do not perform any procedure until you read this information and you understand this information. The Caterpillar catalytic converter is designed to convert carbon monoxide, hydrocarbons, and aldehydes into carbon dioxide and water. The equations in Table 1 are the unbalanced chemical reactions. Substrate \u2013 typically a grid or honeycomb structure that directs exhaust flow and provides a surface area for a catalyst to be supported. Conversion efficiency - The ratio of a system's emission output that is compared to the system's emission input Catalyst - A catalyst is a substance that accelerates a chemical reaction without being affected by the reaction. The Cat Retrofit TWC (three-way converter) and OC (Oxidation Catalyst) are designed for spark-ignited engines, gas engines. The DOC (Diesel Oxidation Catalyst) is designed for compression ignition or diesel engines. They all feature a high-performance, durable catalyst formulation. The catalyst is supported on a ceramic honeycomb substrate and housed within a stainless steel enclosure. This proprietary catalyst technology is available in either stand-alone converter or converter\/muffler combination. Overview The catalysts can be built into standard units, with end housings to transition to the exhaust pipe, or built inside a replacement muffler system. It is easily installed in the exhaust system by using standard clamps. In general, clamped units are shipped assembled. If a unit is to be unclamped for any reason, reinstall as shown in the exploded view above. Tighten bolts to 200 in-lbs. Care must be used in handling the graphite gaskets. These gaskets are extremely fragile. Any deformation or cracking renders the gasket unusable and it must be replaced. Contact your Cat Dealer for replacement gaskets. If a stock muffler is to be used in conjunction with the Cat TWC, the Cat TWC must be installed in front (engine side) of the muffler  Prior study with biodiesel and its blends with ultra-low sulfur diesel (ULSD) and renewable diesel (RD) showed that a commercial diesel oxidation catalyst (DOC) is unable to effectively oxidize neat biodiesel (B100) or high-level biodiesel blends injected into the exhaust of a diesel engine at challenging conditions of low temperature, high exhaust flow rate and high dosing rate. In steady-state performance tests, the performance of blends up to B50 in ULSD or RD was nearly equivalent to ULSD at the lowest exhaust flow rate or for exhaust temperature over 340 degrees C for medium and high flows. ULSD blends above 50 vol% biodiesel exhibited reduced thermal efficiency and DOC outlet temperature with increasing dosing rate and required exhaust temperatures over 400 degrees C to achieve similar performance as ULSD. For RD blends at higher flow rates and temperatures below 300 degrees C even B10 blends showed some loss in performance at the highest dosing rates. Data showed an increase in lightoff temperature with an increase in biodiesel concentration in both the ULSD and RD blends. Here we conducted a limited study with higher catalyst volume and increased platinum group metal (PGM) loading to see if these factors would improve DOC performance with B100. ULSD, RD and B100 were run on steady-state performance test with the same DOC used previously. To assess the impact of PGM loading and catalyst volume we also used a three-way catalyst (TWC) for comparison to the DOC. The TWC consisted of two bricks and the test was run with one and both bricks to assess the impact of catalyst volume. The data showed that the single brick of TWC was marginally better than the DOC with better light off performance for B100 at low temperatures and exhaust flow rates. The entire TWC (two bricks) was significantly better than the DOC showing marginally better performance at low temperature and exhaust flow rate and significantly improved performance at low temperature and medium flow rate. The additional catalyst volume and higher overall catalyst loading produced better oxidation of B100 even at the most challenging conditions - with increased catalyst volume (increased residence time) have the largest effect. Original languageAmerican English Number of pages10 StatePublished - 2025 EventWCX SAE World Congress Experience - Detroit, Michigan Duration: 8 Apr 2025 \u2192 10 Apr 2025 Conference ConferenceWCX SAE World Congress Experience CityDetroit, Michigan Period8\/04\/25 \u2192 10\/04\/25 NLR Publication Number NREL\/CP-2A00-95780 Keywords biodieselcatalystsdiesel \/ compression ignition enginesemissions measurementthree-way catalysts\">\u00a0<strong>trosmjerni katalizator<\/strong><\/a>\u00a0vr\u0161i slo\u017eeno balansiranje. Istovremeno upravlja tri primarna zaga\u0111iva\u010da. To uklju\u010duje du\u0161ikove okside (NOx), uglji\u010dni monoksid (CO) i nesagorjele ugljikovodike (HC). Ure\u0111aj najefikasnije radi u stehiometrijskoj ta\u010dki. To je precizan odnos zraka i goriva gdje dolazi do potpunog sagorijevanja.<\/p>\n\n\n\n<p>Unutar\u00a0<strong><a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">trosmjerni katalizator<\/a><\/strong>, odvijaju se specifi\u010dne hemijske reakcije. Redukcija NOx u du\u0161ik i kisik doga\u0111a se na povr\u0161ini rodija. Istovremeno, platina ili paladij poti\u010du oksidaciju CO i HC. Ova priroda dvostrukog djelovanja \u010dini\u00a0<a href=\"http:\/\/Noted that, you are an experienced SEOer in three way catalytic converter, I need you to rewrite my article with different words but in same maning in 2500 words to 7500 words, And here are my detailed requirements as below:  1. The title of the rewrite article should be same or similar to my article strictly, and the title should be in 60 letters.  2. You should add extra 1 or 2 paragraph with the subtitle into the rewrite article which can make the new article more readable.  3. Please add a table or sheet or two to your article to compare data or list types, but this is not necessary.  4. The rewrite article must be in the style of scientific and technological explanatory writing or argumentative writing, using more short sentences and avoiding the appearance of overly long sentence.  5. The rewite article should use active voice instead of passive voice for declarative sentences!  6. The rewrite article,should focus on those kewwords.three way catalytic converter  7. l need the introduction at the beginning of the rewite aricle, the concluion at the end.And give me the seo-friendly meta description after you finish the new article.  8. I need you list some outer links which l can insert to the rewrite article.  My article:  TWC vs DOC: Oxidation Performance Comparison  The main difference in oxidation performance is that a Diesel Oxidation Catalyst (DOC) excels at oxidizing HC, CO, and PM organic fraction in lean diesel exhaust, while a Three-Way Catalyst (TWC) handles near-stoichiometric conditions to reduce NOx, CO, and HC simultaneously, making it superior for gasoline engines but less effective for methane in diesel; however, with increased catalyst volume\/PGM loading, even TWCs can significantly boost low-temperature DOC performance for challenging fuels like B100.  Diesel Oxidation Catalyst (DOC) Performance Strengths: Highly effective at high temperatures for oxidizing CO, Hydrocarbons (HC), and diesel particulate matter (PM) organic fraction (OF) in lean exhaust, reducing odor. Weaknesses: Poor methane (CH4) conversion (often <30%) and no NOx reduction capability; requires higher temperatures to light-off. Best For: Diesel engines, reducing PM and HC\/CO, especially with higher sulfur or renewable fuels (HVO, B100), where it can be optimized.  Three-Way Catalyst (TWC) Performance Strengths: Simultaneously oxidizes CO\/HC and reduces NOx under stoichiometric (near-stoichiometric) conditions, crucial for gasoline engines. Weaknesses: Requires precise air-fuel ratios (stoichiometric); struggles with lean-burn conditions typical of diesel, especially with methane. Application: Dominant for gasoline engines but can be adapted for diesel by increasing catalyst volume or PGM loading, significantly improving low-temp HC\/CO oxidation and performance with alternative fuels like B100.  Key Comparison Points Fuel Type: DOC for diesel (lean), TWC for gasoline (stoichiometric). Pollutants: DOC targets HC, CO, PM; TWC targets HC, CO, &amp; NOx. Methane: DOC is very poor; TWC needs specific conditions (like lean-rich cycling) to handle it better but still struggles with high CH4. Optimization: For challenging diesel applications (e.g., high % biofuel), adding a TWC or increasing PGM\/volume of a DOC greatly improves low-temperature oxidation and overall efficiency.  In essence, a DOC is a simpler oxidation catalyst for diesel, while a TWC offers more complex, multi-pollutant control but requires specific operating conditions, though it can be enhanced to significantly boost diesel oxidation performance where needed.   Do not perform any procedure until you read this information and you understand this information. The Caterpillar catalytic converter is designed to convert carbon monoxide, hydrocarbons, and aldehydes into carbon dioxide and water. The equations in Table 1 are the unbalanced chemical reactions. Substrate \u2013 typically a grid or honeycomb structure that directs exhaust flow and provides a surface area for a catalyst to be supported. Conversion efficiency - The ratio of a system's emission output that is compared to the system's emission input Catalyst - A catalyst is a substance that accelerates a chemical reaction without being affected by the reaction. The Cat Retrofit TWC (three-way converter) and OC (Oxidation Catalyst) are designed for spark-ignited engines, gas engines. The DOC (Diesel Oxidation Catalyst) is designed for compression ignition or diesel engines. They all feature a high-performance, durable catalyst formulation. The catalyst is supported on a ceramic honeycomb substrate and housed within a stainless steel enclosure. This proprietary catalyst technology is available in either stand-alone converter or converter\/muffler combination. Overview The catalysts can be built into standard units, with end housings to transition to the exhaust pipe, or built inside a replacement muffler system. It is easily installed in the exhaust system by using standard clamps. In general, clamped units are shipped assembled. If a unit is to be unclamped for any reason, reinstall as shown in the exploded view above. Tighten bolts to 200 in-lbs. Care must be used in handling the graphite gaskets. These gaskets are extremely fragile. Any deformation or cracking renders the gasket unusable and it must be replaced. Contact your Cat Dealer for replacement gaskets. If a stock muffler is to be used in conjunction with the Cat TWC, the Cat TWC must be installed in front (engine side) of the muffler  Prior study with biodiesel and its blends with ultra-low sulfur diesel (ULSD) and renewable diesel (RD) showed that a commercial diesel oxidation catalyst (DOC) is unable to effectively oxidize neat biodiesel (B100) or high-level biodiesel blends injected into the exhaust of a diesel engine at challenging conditions of low temperature, high exhaust flow rate and high dosing rate. In steady-state performance tests, the performance of blends up to B50 in ULSD or RD was nearly equivalent to ULSD at the lowest exhaust flow rate or for exhaust temperature over 340 degrees C for medium and high flows. ULSD blends above 50 vol% biodiesel exhibited reduced thermal efficiency and DOC outlet temperature with increasing dosing rate and required exhaust temperatures over 400 degrees C to achieve similar performance as ULSD. For RD blends at higher flow rates and temperatures below 300 degrees C even B10 blends showed some loss in performance at the highest dosing rates. Data showed an increase in lightoff temperature with an increase in biodiesel concentration in both the ULSD and RD blends. Here we conducted a limited study with higher catalyst volume and increased platinum group metal (PGM) loading to see if these factors would improve DOC performance with B100. ULSD, RD and B100 were run on steady-state performance test with the same DOC used previously. To assess the impact of PGM loading and catalyst volume we also used a three-way catalyst (TWC) for comparison to the DOC. The TWC consisted of two bricks and the test was run with one and both bricks to assess the impact of catalyst volume. The data showed that the single brick of TWC was marginally better than the DOC with better light off performance for B100 at low temperatures and exhaust flow rates. The entire TWC (two bricks) was significantly better than the DOC showing marginally better performance at low temperature and exhaust flow rate and significantly improved performance at low temperature and medium flow rate. The additional catalyst volume and higher overall catalyst loading produced better oxidation of B100 even at the most challenging conditions - with increased catalyst volume (increased residence time) have the largest effect. Original languageAmerican English Number of pages10 StatePublished - 2025 EventWCX SAE World Congress Experience - Detroit, Michigan Duration: 8 Apr 2025 \u2192 10 Apr 2025 Conference ConferenceWCX SAE World Congress Experience CityDetroit, Michigan Period8\/04\/25 \u2192 10\/04\/25 NLR Publication Number NREL\/CP-2A00-95780 Keywords biodieselcatalystsdiesel \/ compression ignition enginesemissions measurementthree-way catalysts\"><strong>trosmjerni katalizator<\/strong>\u00a0<\/a>svestran alat. Me\u0111utim, zahtijeva uzak radni prozor. Ako koncentracija kisika fluktuira, efikasnost konverzije zna\u010dajno opada.<\/p>\n\n\n\n<p>U modernim primjenama, in\u017eenjeri koriste senzor kisika kako bi odr\u017eali ovu ravnote\u017eu. Ovaj senzor pru\u017ea povratnu informaciju upravlja\u010dkoj jedinici motora (ECU). ECU zatim pode\u0161ava ubrizgavanje goriva u realnom vremenu. Ovo osigurava...\u00a0<strong><a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">trosmjerni katalizator<\/a><\/strong>\u00a0ostaje unutar svoje zone vrhunskih performansi. Bez ove precizne kontrole, TWC ne mo\u017ee efikasno smanjiti NOx.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/3waycatalyst.com\/bs\/the-crucial-role-of-oxygen-sensors-in-catalytic-converter-performance\/\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"635\" src=\"https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/08\/The-Crucial-Role-of-Oxygen-Sensors-in-Catalytic-Converter-Performance-01.jpg\" alt=\"Klju\u010dna uloga senzora kisika u performansama kataliti\u010dkog konvertora\" class=\"wp-image-3378\" title=\"\" srcset=\"https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/08\/The-Crucial-Role-of-Oxygen-Sensors-in-Catalytic-Converter-Performance-01.jpg 1024w, https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/08\/The-Crucial-Role-of-Oxygen-Sensors-in-Catalytic-Converter-Performance-01-300x186.jpg 300w, https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/08\/The-Crucial-Role-of-Oxygen-Sensors-in-Catalytic-Converter-Performance-01-768x476.jpg 768w, https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/08\/The-Crucial-Role-of-Oxygen-Sensors-in-Catalytic-Converter-Performance-01-18x12.jpg 18w, https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/08\/The-Crucial-Role-of-Oxygen-Sensors-in-Catalytic-Converter-Performance-01-600x372.jpg 600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/3waycatalyst.com\/bs\/the-crucial-role-of-oxygen-sensors-in-catalytic-converter-performance\/\">Klju\u010dna uloga senzora kisika u performansama kataliti\u010dkog konvertora<\/a><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"the-specialized-function-of-diesel-oxidation-catalysts\">Specijalizirana funkcija katalizatora oksidacije dizela<\/h2>\n\n\n\n<p>Dizel motori rade druga\u010dije od benzinskih motora. Koriste proces sagorijevanja siroma\u0161ne smjese. To zna\u010di da ispu\u0161ni plinovi uvijek sadr\u017ee vi\u0161ak kisika. Zbog ovog okru\u017eenja s visokim udjelom kisika, DOC ne mo\u017ee izvoditi reakcije redukcije. Fokusira se isklju\u010divo na oksidaciju.<\/p>\n\n\n\n<p>DOC se isti\u010de u uklanjanju organske frakcije \u010destica (PM). Tako\u0111er pretvara uglji\u010dni monoksid i plinovite ugljikovodike u vodu i uglji\u010dni dioksid. U mnogim dizelskim sistemima, DOC djeluje kao prva faza lanca naknadne obrade. Priprema ispu\u0161ne plinove za sljede\u0107e komponente poput filtera dizelskih \u010destica (DPF).<\/p>\n\n\n\n<p>Me\u0111utim, DOC ima fizi\u010dka ograni\u010denja. Pokazuje slabe performanse kada se radi s metanom (CH4). U mnogim testovima, stope konverzije metana ostaju ispod 30%. Nadalje, DOC-u je potrebna zna\u010dajna toplina za pokretanje reakcije. Ova temperatura &#034;ga\u0161enja&#034; je kriti\u010dna metrika za emisije pri hladnom startu. Ako se motor previ\u0161e ohladi, DOC ostaje neaktivan, omogu\u0107avaju\u0107i ispu\u0161tanje sirovih zaga\u0111iva\u010da.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"the-impact-of-precious-metal-loading-on-catalyst-longevity\">Utjecaj punjenja plemenitim metalima na vijek trajanja katalizatora<\/h2>\n\n\n\n<p>Sadr\u017eaj plemenitih metala odre\u0111uje vijek trajanja i efikasnost katalizatora. Ovi metali pripadaju platinastoj grupi (PGM). Proizvo\u0111a\u010di koriste platinu, paladij i rodij u razli\u010ditim koncentracijama. Za<a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">\u00a0<strong>trosmjerni katalizator<\/strong><\/a>, odnos ovih metala je klju\u010dan.<\/p>\n\n\n\n<p>Ve\u0107e punjenje PGM-om sni\u017eava temperaturu ga\u0161enja. To omogu\u0107ava katalizatoru da po\u010dne raditi ranije nakon pokretanja motora. Tako\u0111er pove\u0107ava broj aktivnih mjesta na podlozi. Vi\u0161e aktivnih mjesta zna\u010di da katalizator mo\u017ee podnijeti ve\u0107u koli\u010dinu ispu\u0161nih plinova. U kontekstu...\u00a0<strong><a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">trosmjerni katalizator<\/a><\/strong>, pove\u0107anje koli\u010dine PGM-a direktno pobolj\u0161ava oksidaciju slo\u017eenih ugljikovodika.<\/p>\n\n\n\n<p>Dugotrajnost tako\u0111er ovisi o stabilnosti premaza. Premaz dr\u017ei PGM na mjestu. Vremenom, visoke temperature mogu uzrokovati &#034;sinteriranje&#034; ili zgrudnjavanje metalnih \u010destica. To smanjuje efektivnu povr\u0161inu. Napredno<a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\"> TWC <\/a>Dizajni koriste stabilizatore poput cerija i cirkonija. Ovi materijali sprje\u010davaju sinteriranje i pobolj\u0161avaju kapacitet skladi\u0161tenja kisika. To osigurava<a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">\u00a0<strong>trosmjerni katalizator<\/strong>\u00a0<\/a>odr\u017eava visoku efikasnost konverzije preko 100.000 milja.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/3waycatalyst.com\/bs\/platinum-palladium-rhodium-why-these-precious-metals-are-crucial-for-catalytic-converters\/\"><img decoding=\"async\" width=\"1024\" height=\"635\" src=\"https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/08\/Why-Are-Precious-Metals-Like-Platinum-Palladium-and-Rhodium-Vital-for-Catalytic-Converters.jpg\" alt=\"Platina, paladij, rodij: Za\u0161to su ovi plemeniti metali klju\u010dni za kataliti\u010dke konvertore\" class=\"wp-image-3352\" title=\"\" srcset=\"https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/08\/Why-Are-Precious-Metals-Like-Platinum-Palladium-and-Rhodium-Vital-for-Catalytic-Converters.jpg 1024w, https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/08\/Why-Are-Precious-Metals-Like-Platinum-Palladium-and-Rhodium-Vital-for-Catalytic-Converters-300x186.jpg 300w, https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/08\/Why-Are-Precious-Metals-Like-Platinum-Palladium-and-Rhodium-Vital-for-Catalytic-Converters-768x476.jpg 768w, https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/08\/Why-Are-Precious-Metals-Like-Platinum-Palladium-and-Rhodium-Vital-for-Catalytic-Converters-18x12.jpg 18w, https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/08\/Why-Are-Precious-Metals-Like-Platinum-Palladium-and-Rhodium-Vital-for-Catalytic-Converters-600x372.jpg 600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/3waycatalyst.com\/bs\/platinum-palladium-rhodium-why-these-precious-metals-are-crucial-for-catalytic-converters\/\">Platina, paladij, rodij: Za\u0161to su ovi plemeniti metali klju\u010dni za kataliti\u010dke konvertore<\/a><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"thermal-management-strategies-in-modern-exhaust-systems\">Strategije termi\u010dkog upravljanja u modernim ispu\u0161nim sistemima<\/h2>\n\n\n\n<p>Kontrola temperature je najva\u017eniji faktor u performansama katalizatora. Svaki\u00a0<a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\"><strong>trosmjerni katalizator<\/strong>\u00a0<\/a>ima optimalni termalni prozor. Ispod 250\u00b0C, katalizator je obi\u010dno neaktivan. Iznad 800\u00b0C, unutra\u0161nje strukture mogu pretrpjeti trajna termi\u010dka o\u0161te\u0107enja.<\/p>\n\n\n\n<p>In\u017eenjeri koriste nekoliko strategija za upravljanje ovom toplinom. Prvo, postavljaju katalizator blizu ispu\u0161nog kolektora. Ovaj &#034;bliski povezani&#034; polo\u017eaj hvata maksimalnu toplinu iz komore za sagorijevanje. Drugo, koriste izolirane ispu\u0161ne cijevi. To sprje\u010dava gubitak topline prije nego \u0161to plin do\u0111e do...<a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">\u00a0<strong>trosmjerni katalizator<\/strong><\/a>.<\/p>\n\n\n\n<p>Aktivno termalno upravljanje je tako\u0111er uobi\u010dajeno. Neki sistemi koriste ubrizgavanje goriva u kasnom ciklusu. Ovo \u0161alje malu koli\u010dinu nesagorjelog goriva u ispu\u0161ne plinove. Kada ovo gorivo do\u0111e u kontakt s katalizatorom, ono sagorijeva i podi\u017ee temperaturu. Ova tehnika je posebno korisna za regeneraciju dizel filtera ili bu\u0111enje prehlade. <a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">TWC<\/a>Efikasno upravljanje temperaturom osigurava<a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">\u00a0<strong>trosmjerni katalizator<\/strong><\/a>\u00a0ostaje efikasan u svim uslovima vo\u017enje, od gradskog praznog hoda do vo\u017enje autoputem.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"detailed-performance-comparison-matrix\">Detaljna matrica pore\u0111enja performansi<\/h2>\n\n\n\n<p>Sljede\u0107a tabela sumira operativne razlike izme\u0111u standardnog DOC-a i <a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">TWC<\/a> jedinice. Ovi podaci odra\u017eavaju nalaze iz studije Svjetskog kongresa SAE iz 2025. godine.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th>Metrika performansi<\/th><th>Oksidacijski katalizator dizela (DOC)<\/th><th>Trosmjerni kataliti\u010dki pretvara\u010d (TWC)<\/th><\/tr><\/thead><tbody><tr><td><strong>Vrsta sagorijevanja<\/strong><\/td><td>Sagorijevanje siroma\u0161ne smjese (kompresija)<\/td><td>Stehiometrijski (Spark)<\/td><\/tr><tr><td><strong>NOx konverzija<\/strong><\/td><td>Zanemarivo<\/td><td>Vrlo visoko (&gt;95%)<\/td><\/tr><tr><td><strong>Oksidacija CO<\/strong><\/td><td>Visoko (na &gt;300\u00b0C)<\/td><td>Superiorni (po stehiometriji)<\/td><\/tr><tr><td><strong>Kontrola ugljikovodika<\/strong><\/td><td>Odli\u010dno za dizel HC<\/td><td>Odli\u010dno za benzinske HC<\/td><\/tr><tr><td><strong>Efikasnost metana<\/strong><\/td><td>Poor (&lt;30%)<\/td><td>Umjereno (varira ovisno o PGM-u)<\/td><\/tr><tr><td><strong>Prilagodljivost biodizela (B100)<\/strong><\/td><td>Ograni\u010deno na niskim temperaturama<\/td><td>Visoko (sa pove\u0107anom ja\u010dinom zvuka)<\/td><\/tr><tr><td><strong>Materijal podloge<\/strong><\/td><td>Kerami\u010dko\/metalno sa\u0107e<\/td><td>Keramika visoke gusto\u0107e<\/td><\/tr><tr><td><strong>Osjetljivost na kisik<\/strong><\/td><td>Nisko (uspijeva u O2)<\/td><td>Visoko (Zahtijeva ravnote\u017eu)<\/td><\/tr><tr><td><strong>Tipi\u010dna primjena<\/strong><\/td><td>Te\u0161ki kamioni\/traktori<\/td><td>Putni\u010dka vozila\/benzinski motori<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"challenging-fuels-the-biodiesel-b100-case-study\">Izazovna goriva: Studija slu\u010daja biodizela (B100)<\/h2>\n\n\n\n<p>Prelazak na obnovljiva goriva poput biodizela B100 uvodi nove varijable. Biodizel ima vi\u0161u ta\u010dku klju\u010danja od dizela sa ultra niskim sadr\u017eajem sumpora (ULSD). Tako\u0111er sadr\u017ei vi\u0161e kisika u svojoj molekularnoj strukturi. Nedavne studije pokazuju da standardni DOC ima pote\u0161ko\u0107a sa B100 u uslovima visokog protoka i niske temperature.<\/p>\n\n\n\n<p>Na temperaturama ispod 340\u00b0C, izlazna temperatura DOC-a \u010desto pada pri kori\u0161tenju B100. To ukazuje na neuspjeh u odr\u017eavanju egzotermne oksidacijske reakcije. Kako se koncentracija biodizela pove\u0107ava, raste i temperatura ga\u0161enja. To stvara &#034;jaz u performansama&#034; tokom najkriti\u010dnijih faza rada motora.<\/p>\n\n\n\n<p>The\u00a0<strong><a href=\"http:\/\/Noted that, you are an experienced SEOer in three way catalytic converter, I need you to rewrite my article with different words but in same maning in 2500 words to 7500 words, And here are my detailed requirements as below:  1. The title of the rewrite article should be same or similar to my article strictly, and the title should be in 60 letters.  2. You should add extra 1 or 2 paragraph with the subtitle into the rewrite article which can make the new article more readable.  3. Please add a table or sheet or two to your article to compare data or list types, but this is not necessary.  4. The rewrite article must be in the style of scientific and technological explanatory writing or argumentative writing, using more short sentences and avoiding the appearance of overly long sentence.  5. The rewite article should use active voice instead of passive voice for declarative sentences!  6. The rewrite article,should focus on those kewwords.three way catalytic converter  7. l need the introduction at the beginning of the rewite aricle, the concluion at the end.And give me the seo-friendly meta description after you finish the new article.  8. I need you list some outer links which l can insert to the rewrite article.  My article:  TWC vs DOC: Oxidation Performance Comparison  The main difference in oxidation performance is that a Diesel Oxidation Catalyst (DOC) excels at oxidizing HC, CO, and PM organic fraction in lean diesel exhaust, while a Three-Way Catalyst (TWC) handles near-stoichiometric conditions to reduce NOx, CO, and HC simultaneously, making it superior for gasoline engines but less effective for methane in diesel; however, with increased catalyst volume\/PGM loading, even TWCs can significantly boost low-temperature DOC performance for challenging fuels like B100.  Diesel Oxidation Catalyst (DOC) Performance Strengths: Highly effective at high temperatures for oxidizing CO, Hydrocarbons (HC), and diesel particulate matter (PM) organic fraction (OF) in lean exhaust, reducing odor. Weaknesses: Poor methane (CH4) conversion (often <30%) and no NOx reduction capability; requires higher temperatures to light-off. Best For: Diesel engines, reducing PM and HC\/CO, especially with higher sulfur or renewable fuels (HVO, B100), where it can be optimized.  Three-Way Catalyst (TWC) Performance Strengths: Simultaneously oxidizes CO\/HC and reduces NOx under stoichiometric (near-stoichiometric) conditions, crucial for gasoline engines. Weaknesses: Requires precise air-fuel ratios (stoichiometric); struggles with lean-burn conditions typical of diesel, especially with methane. Application: Dominant for gasoline engines but can be adapted for diesel by increasing catalyst volume or PGM loading, significantly improving low-temp HC\/CO oxidation and performance with alternative fuels like B100.  Key Comparison Points Fuel Type: DOC for diesel (lean), TWC for gasoline (stoichiometric). Pollutants: DOC targets HC, CO, PM; TWC targets HC, CO, &amp; NOx. Methane: DOC is very poor; TWC needs specific conditions (like lean-rich cycling) to handle it better but still struggles with high CH4. Optimization: For challenging diesel applications (e.g., high % biofuel), adding a TWC or increasing PGM\/volume of a DOC greatly improves low-temperature oxidation and overall efficiency.  In essence, a DOC is a simpler oxidation catalyst for diesel, while a TWC offers more complex, multi-pollutant control but requires specific operating conditions, though it can be enhanced to significantly boost diesel oxidation performance where needed.   Do not perform any procedure until you read this information and you understand this information. The Caterpillar catalytic converter is designed to convert carbon monoxide, hydrocarbons, and aldehydes into carbon dioxide and water. The equations in Table 1 are the unbalanced chemical reactions. Substrate \u2013 typically a grid or honeycomb structure that directs exhaust flow and provides a surface area for a catalyst to be supported. Conversion efficiency - The ratio of a system's emission output that is compared to the system's emission input Catalyst - A catalyst is a substance that accelerates a chemical reaction without being affected by the reaction. The Cat Retrofit TWC (three-way converter) and OC (Oxidation Catalyst) are designed for spark-ignited engines, gas engines. The DOC (Diesel Oxidation Catalyst) is designed for compression ignition or diesel engines. They all feature a high-performance, durable catalyst formulation. The catalyst is supported on a ceramic honeycomb substrate and housed within a stainless steel enclosure. This proprietary catalyst technology is available in either stand-alone converter or converter\/muffler combination. Overview The catalysts can be built into standard units, with end housings to transition to the exhaust pipe, or built inside a replacement muffler system. It is easily installed in the exhaust system by using standard clamps. In general, clamped units are shipped assembled. If a unit is to be unclamped for any reason, reinstall as shown in the exploded view above. Tighten bolts to 200 in-lbs. Care must be used in handling the graphite gaskets. These gaskets are extremely fragile. Any deformation or cracking renders the gasket unusable and it must be replaced. Contact your Cat Dealer for replacement gaskets. If a stock muffler is to be used in conjunction with the Cat TWC, the Cat TWC must be installed in front (engine side) of the muffler  Prior study with biodiesel and its blends with ultra-low sulfur diesel (ULSD) and renewable diesel (RD) showed that a commercial diesel oxidation catalyst (DOC) is unable to effectively oxidize neat biodiesel (B100) or high-level biodiesel blends injected into the exhaust of a diesel engine at challenging conditions of low temperature, high exhaust flow rate and high dosing rate. In steady-state performance tests, the performance of blends up to B50 in ULSD or RD was nearly equivalent to ULSD at the lowest exhaust flow rate or for exhaust temperature over 340 degrees C for medium and high flows. ULSD blends above 50 vol% biodiesel exhibited reduced thermal efficiency and DOC outlet temperature with increasing dosing rate and required exhaust temperatures over 400 degrees C to achieve similar performance as ULSD. For RD blends at higher flow rates and temperatures below 300 degrees C even B10 blends showed some loss in performance at the highest dosing rates. Data showed an increase in lightoff temperature with an increase in biodiesel concentration in both the ULSD and RD blends. Here we conducted a limited study with higher catalyst volume and increased platinum group metal (PGM) loading to see if these factors would improve DOC performance with B100. ULSD, RD and B100 were run on steady-state performance test with the same DOC used previously. To assess the impact of PGM loading and catalyst volume we also used a three-way catalyst (TWC) for comparison to the DOC. The TWC consisted of two bricks and the test was run with one and both bricks to assess the impact of catalyst volume. The data showed that the single brick of TWC was marginally better than the DOC with better light off performance for B100 at low temperatures and exhaust flow rates. The entire TWC (two bricks) was significantly better than the DOC showing marginally better performance at low temperature and exhaust flow rate and significantly improved performance at low temperature and medium flow rate. The additional catalyst volume and higher overall catalyst loading produced better oxidation of B100 even at the most challenging conditions - with increased catalyst volume (increased residence time) have the largest effect. Original languageAmerican English Number of pages10 StatePublished - 2025 EventWCX SAE World Congress Experience - Detroit, Michigan Duration: 8 Apr 2025 \u2192 10 Apr 2025 Conference ConferenceWCX SAE World Congress Experience CityDetroit, Michigan Period8\/04\/25 \u2192 10\/04\/25 NLR Publication Number NREL\/CP-2A00-95780 Keywords biodieselcatalystsdiesel \/ compression ignition enginesemissions measurementthree-way catalysts\">trosmjerni katalizator<\/a><\/strong>\u00a0nudi iznena\u0111uju\u0107e rje\u0161enje. Istra\u017eiva\u010di su testirali <a href=\"http:\/\/Noted that, you are an experienced SEOer in three way catalytic converter, I need you to rewrite my article with different words but in same maning in 2500 words to 7500 words, And here are my detailed requirements as below:  1. The title of the rewrite article should be same or similar to my article strictly, and the title should be in 60 letters.  2. You should add extra 1 or 2 paragraph with the subtitle into the rewrite article which can make the new article more readable.  3. Please add a table or sheet or two to your article to compare data or list types, but this is not necessary.  4. The rewrite article must be in the style of scientific and technological explanatory writing or argumentative writing, using more short sentences and avoiding the appearance of overly long sentence.  5. The rewite article should use active voice instead of passive voice for declarative sentences!  6. The rewrite article,should focus on those kewwords.three way catalytic converter  7. l need the introduction at the beginning of the rewite aricle, the concluion at the end.And give me the seo-friendly meta description after you finish the new article.  8. I need you list some outer links which l can insert to the rewrite article.  My article:  TWC vs DOC: Oxidation Performance Comparison  The main difference in oxidation performance is that a Diesel Oxidation Catalyst (DOC) excels at oxidizing HC, CO, and PM organic fraction in lean diesel exhaust, while a Three-Way Catalyst (TWC) handles near-stoichiometric conditions to reduce NOx, CO, and HC simultaneously, making it superior for gasoline engines but less effective for methane in diesel; however, with increased catalyst volume\/PGM loading, even TWCs can significantly boost low-temperature DOC performance for challenging fuels like B100.  Diesel Oxidation Catalyst (DOC) Performance Strengths: Highly effective at high temperatures for oxidizing CO, Hydrocarbons (HC), and diesel particulate matter (PM) organic fraction (OF) in lean exhaust, reducing odor. Weaknesses: Poor methane (CH4) conversion (often <30%) and no NOx reduction capability; requires higher temperatures to light-off. Best For: Diesel engines, reducing PM and HC\/CO, especially with higher sulfur or renewable fuels (HVO, B100), where it can be optimized.  Three-Way Catalyst (TWC) Performance Strengths: Simultaneously oxidizes CO\/HC and reduces NOx under stoichiometric (near-stoichiometric) conditions, crucial for gasoline engines. Weaknesses: Requires precise air-fuel ratios (stoichiometric); struggles with lean-burn conditions typical of diesel, especially with methane. Application: Dominant for gasoline engines but can be adapted for diesel by increasing catalyst volume or PGM loading, significantly improving low-temp HC\/CO oxidation and performance with alternative fuels like B100.  Key Comparison Points Fuel Type: DOC for diesel (lean), TWC for gasoline (stoichiometric). Pollutants: DOC targets HC, CO, PM; TWC targets HC, CO, &amp; NOx. Methane: DOC is very poor; TWC needs specific conditions (like lean-rich cycling) to handle it better but still struggles with high CH4. Optimization: For challenging diesel applications (e.g., high % biofuel), adding a TWC or increasing PGM\/volume of a DOC greatly improves low-temperature oxidation and overall efficiency.  In essence, a DOC is a simpler oxidation catalyst for diesel, while a TWC offers more complex, multi-pollutant control but requires specific operating conditions, though it can be enhanced to significantly boost diesel oxidation performance where needed.   Do not perform any procedure until you read this information and you understand this information. The Caterpillar catalytic converter is designed to convert carbon monoxide, hydrocarbons, and aldehydes into carbon dioxide and water. The equations in Table 1 are the unbalanced chemical reactions. Substrate \u2013 typically a grid or honeycomb structure that directs exhaust flow and provides a surface area for a catalyst to be supported. Conversion efficiency - The ratio of a system's emission output that is compared to the system's emission input Catalyst - A catalyst is a substance that accelerates a chemical reaction without being affected by the reaction. The Cat Retrofit TWC (three-way converter) and OC (Oxidation Catalyst) are designed for spark-ignited engines, gas engines. The DOC (Diesel Oxidation Catalyst) is designed for compression ignition or diesel engines. They all feature a high-performance, durable catalyst formulation. The catalyst is supported on a ceramic honeycomb substrate and housed within a stainless steel enclosure. This proprietary catalyst technology is available in either stand-alone converter or converter\/muffler combination. Overview The catalysts can be built into standard units, with end housings to transition to the exhaust pipe, or built inside a replacement muffler system. It is easily installed in the exhaust system by using standard clamps. In general, clamped units are shipped assembled. If a unit is to be unclamped for any reason, reinstall as shown in the exploded view above. Tighten bolts to 200 in-lbs. Care must be used in handling the graphite gaskets. These gaskets are extremely fragile. Any deformation or cracking renders the gasket unusable and it must be replaced. Contact your Cat Dealer for replacement gaskets. If a stock muffler is to be used in conjunction with the Cat TWC, the Cat TWC must be installed in front (engine side) of the muffler  Prior study with biodiesel and its blends with ultra-low sulfur diesel (ULSD) and renewable diesel (RD) showed that a commercial diesel oxidation catalyst (DOC) is unable to effectively oxidize neat biodiesel (B100) or high-level biodiesel blends injected into the exhaust of a diesel engine at challenging conditions of low temperature, high exhaust flow rate and high dosing rate. In steady-state performance tests, the performance of blends up to B50 in ULSD or RD was nearly equivalent to ULSD at the lowest exhaust flow rate or for exhaust temperature over 340 degrees C for medium and high flows. ULSD blends above 50 vol% biodiesel exhibited reduced thermal efficiency and DOC outlet temperature with increasing dosing rate and required exhaust temperatures over 400 degrees C to achieve similar performance as ULSD. For RD blends at higher flow rates and temperatures below 300 degrees C even B10 blends showed some loss in performance at the highest dosing rates. Data showed an increase in lightoff temperature with an increase in biodiesel concentration in both the ULSD and RD blends. Here we conducted a limited study with higher catalyst volume and increased platinum group metal (PGM) loading to see if these factors would improve DOC performance with B100. ULSD, RD and B100 were run on steady-state performance test with the same DOC used previously. To assess the impact of PGM loading and catalyst volume we also used a three-way catalyst (TWC) for comparison to the DOC. The TWC consisted of two bricks and the test was run with one and both bricks to assess the impact of catalyst volume. The data showed that the single brick of TWC was marginally better than the DOC with better light off performance for B100 at low temperatures and exhaust flow rates. The entire TWC (two bricks) was significantly better than the DOC showing marginally better performance at low temperature and exhaust flow rate and significantly improved performance at low temperature and medium flow rate. The additional catalyst volume and higher overall catalyst loading produced better oxidation of B100 even at the most challenging conditions - with increased catalyst volume (increased residence time) have the largest effect. Original languageAmerican English Number of pages10 StatePublished - 2025 EventWCX SAE World Congress Experience - Detroit, Michigan Duration: 8 Apr 2025 \u2192 10 Apr 2025 Conference ConferenceWCX SAE World Congress Experience CityDetroit, Michigan Period8\/04\/25 \u2192 10\/04\/25 NLR Publication Number NREL\/CP-2A00-95780 Keywords biodieselcatalystsdiesel \/ compression ignition enginesemissions measurementthree-way catalysts\">TWC<\/a> jedinice na dizel motorima koji koriste B100. Otkrili su da je jedan <a href=\"http:\/\/Noted that, you are an experienced SEOer in three way catalytic converter, I need you to rewrite my article with different words but in same maning in 2500 words to 7500 words, And here are my detailed requirements as below:  1. The title of the rewrite article should be same or similar to my article strictly, and the title should be in 60 letters.  2. You should add extra 1 or 2 paragraph with the subtitle into the rewrite article which can make the new article more readable.  3. Please add a table or sheet or two to your article to compare data or list types, but this is not necessary.  4. The rewrite article must be in the style of scientific and technological explanatory writing or argumentative writing, using more short sentences and avoiding the appearance of overly long sentence.  5. The rewite article should use active voice instead of passive voice for declarative sentences!  6. The rewrite article,should focus on those kewwords.three way catalytic converter  7. l need the introduction at the beginning of the rewite aricle, the concluion at the end.And give me the seo-friendly meta description after you finish the new article.  8. I need you list some outer links which l can insert to the rewrite article.  My article:  TWC vs DOC: Oxidation Performance Comparison  The main difference in oxidation performance is that a Diesel Oxidation Catalyst (DOC) excels at oxidizing HC, CO, and PM organic fraction in lean diesel exhaust, while a Three-Way Catalyst (TWC) handles near-stoichiometric conditions to reduce NOx, CO, and HC simultaneously, making it superior for gasoline engines but less effective for methane in diesel; however, with increased catalyst volume\/PGM loading, even TWCs can significantly boost low-temperature DOC performance for challenging fuels like B100.  Diesel Oxidation Catalyst (DOC) Performance Strengths: Highly effective at high temperatures for oxidizing CO, Hydrocarbons (HC), and diesel particulate matter (PM) organic fraction (OF) in lean exhaust, reducing odor. Weaknesses: Poor methane (CH4) conversion (often <30%) and no NOx reduction capability; requires higher temperatures to light-off. Best For: Diesel engines, reducing PM and HC\/CO, especially with higher sulfur or renewable fuels (HVO, B100), where it can be optimized.  Three-Way Catalyst (TWC) Performance Strengths: Simultaneously oxidizes CO\/HC and reduces NOx under stoichiometric (near-stoichiometric) conditions, crucial for gasoline engines. Weaknesses: Requires precise air-fuel ratios (stoichiometric); struggles with lean-burn conditions typical of diesel, especially with methane. Application: Dominant for gasoline engines but can be adapted for diesel by increasing catalyst volume or PGM loading, significantly improving low-temp HC\/CO oxidation and performance with alternative fuels like B100.  Key Comparison Points Fuel Type: DOC for diesel (lean), TWC for gasoline (stoichiometric). Pollutants: DOC targets HC, CO, PM; TWC targets HC, CO, &amp; NOx. Methane: DOC is very poor; TWC needs specific conditions (like lean-rich cycling) to handle it better but still struggles with high CH4. Optimization: For challenging diesel applications (e.g., high % biofuel), adding a TWC or increasing PGM\/volume of a DOC greatly improves low-temperature oxidation and overall efficiency.  In essence, a DOC is a simpler oxidation catalyst for diesel, while a TWC offers more complex, multi-pollutant control but requires specific operating conditions, though it can be enhanced to significantly boost diesel oxidation performance where needed.   Do not perform any procedure until you read this information and you understand this information. The Caterpillar catalytic converter is designed to convert carbon monoxide, hydrocarbons, and aldehydes into carbon dioxide and water. The equations in Table 1 are the unbalanced chemical reactions. Substrate \u2013 typically a grid or honeycomb structure that directs exhaust flow and provides a surface area for a catalyst to be supported. Conversion efficiency - The ratio of a system's emission output that is compared to the system's emission input Catalyst - A catalyst is a substance that accelerates a chemical reaction without being affected by the reaction. The Cat Retrofit TWC (three-way converter) and OC (Oxidation Catalyst) are designed for spark-ignited engines, gas engines. The DOC (Diesel Oxidation Catalyst) is designed for compression ignition or diesel engines. They all feature a high-performance, durable catalyst formulation. The catalyst is supported on a ceramic honeycomb substrate and housed within a stainless steel enclosure. This proprietary catalyst technology is available in either stand-alone converter or converter\/muffler combination. Overview The catalysts can be built into standard units, with end housings to transition to the exhaust pipe, or built inside a replacement muffler system. It is easily installed in the exhaust system by using standard clamps. In general, clamped units are shipped assembled. If a unit is to be unclamped for any reason, reinstall as shown in the exploded view above. Tighten bolts to 200 in-lbs. Care must be used in handling the graphite gaskets. These gaskets are extremely fragile. Any deformation or cracking renders the gasket unusable and it must be replaced. Contact your Cat Dealer for replacement gaskets. If a stock muffler is to be used in conjunction with the Cat TWC, the Cat TWC must be installed in front (engine side) of the muffler  Prior study with biodiesel and its blends with ultra-low sulfur diesel (ULSD) and renewable diesel (RD) showed that a commercial diesel oxidation catalyst (DOC) is unable to effectively oxidize neat biodiesel (B100) or high-level biodiesel blends injected into the exhaust of a diesel engine at challenging conditions of low temperature, high exhaust flow rate and high dosing rate. In steady-state performance tests, the performance of blends up to B50 in ULSD or RD was nearly equivalent to ULSD at the lowest exhaust flow rate or for exhaust temperature over 340 degrees C for medium and high flows. ULSD blends above 50 vol% biodiesel exhibited reduced thermal efficiency and DOC outlet temperature with increasing dosing rate and required exhaust temperatures over 400 degrees C to achieve similar performance as ULSD. For RD blends at higher flow rates and temperatures below 300 degrees C even B10 blends showed some loss in performance at the highest dosing rates. Data showed an increase in lightoff temperature with an increase in biodiesel concentration in both the ULSD and RD blends. Here we conducted a limited study with higher catalyst volume and increased platinum group metal (PGM) loading to see if these factors would improve DOC performance with B100. ULSD, RD and B100 were run on steady-state performance test with the same DOC used previously. To assess the impact of PGM loading and catalyst volume we also used a three-way catalyst (TWC) for comparison to the DOC. The TWC consisted of two bricks and the test was run with one and both bricks to assess the impact of catalyst volume. The data showed that the single brick of TWC was marginally better than the DOC with better light off performance for B100 at low temperatures and exhaust flow rates. The entire TWC (two bricks) was significantly better than the DOC showing marginally better performance at low temperature and exhaust flow rate and significantly improved performance at low temperature and medium flow rate. The additional catalyst volume and higher overall catalyst loading produced better oxidation of B100 even at the most challenging conditions - with increased catalyst volume (increased residence time) have the largest effect. Original languageAmerican English Number of pages10 StatePublished - 2025 EventWCX SAE World Congress Experience - Detroit, Michigan Duration: 8 Apr 2025 \u2192 10 Apr 2025 Conference ConferenceWCX SAE World Congress Experience CityDetroit, Michigan Period8\/04\/25 \u2192 10\/04\/25 NLR Publication Number NREL\/CP-2A00-95780 Keywords biodieselcatalystsdiesel \/ compression ignition enginesemissions measurementthree-way catalysts\">TWC <\/a>Cigla je nadma\u0161ila standardni DOC. Kada su koristili dva<a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\"> TWC<\/a> cigle - efektivno udvostru\u010duju\u0107i volumen katalizatora - rezultati su se drasti\u010dno pobolj\u0161ali. Pove\u0107ano vrijeme zadr\u017eavanja omogu\u0107ava<a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">\u00a0<strong>trosmjerni katalizator<\/strong><\/a>\u00a0da potpuno oksidiraju te\u0161ke molekule u biodizelu. To dokazuje da velika koli\u010dina <a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">TWC<\/a> sistemi mogu rije\u0161iti probleme performansi povezane s modernim obnovljivim gorivima.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"mechanical-design-and-installation-guidelines\">Smjernice za mehani\u010dki dizajn i instalaciju<\/h2>\n\n\n\n<p>Caterpillar i drugi veliki proizvo\u0111a\u010di nagla\u0161avaju strukturni integritet.\u00a0<strong><a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">trosmjerni katalizator<\/a><\/strong>\u00a0moraju izdr\u017eati intenzivne vibracije i termalne udare. Ve\u0107ina jedinica ima ku\u0107i\u0161te od nehr\u0111aju\u0107eg \u010delika. Ovo ku\u0107i\u0161te \u0161titi krhku kerami\u010dku sa\u0107astu podlogu.<\/p>\n\n\n\n<p>Proces instalacije slijedi stroge protokole. Ako koristite standardni prigu\u0161iva\u010d, morate instalirati\u00a0<strong><a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">trosmjerni katalizator<\/a><\/strong>\u00a0uzvodno od prigu\u0161iva\u010da. Ovaj polo\u017eaj osigurava da katalizator prima najtoplije mogu\u0107e ispu\u0161ne plinove. Instalateri koriste standardne stezaljke za ve\u0107inu jedinica. Me\u0111utim, moraju biti izuzetno oprezni s grafitnim brtvama. Ove brtve su vrlo krhke. Bilo kakva pukotina ili deformacija dovest \u0107e do curenja.<\/p>\n\n\n\n<p>Tehni\u010dari moraju zategnuti sve vijke za monta\u017eu na ta\u010dno 200 in-lbs. Ovaj specifi\u010dni obrtni moment spre\u010dava pomicanje jedinice, a istovremeno omogu\u0107ava termi\u010dko \u0161irenje. Pravilno poravnanje smanjuje mehani\u010dko naprezanje podloge. Dobro instalirana...\u00a0<a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\"><strong>trosmjerni katalizator<\/strong>\u00a0<\/a>pru\u017ea pouzdanu uslugu godinama uz minimalno odr\u017eavanje.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"conversion-efficiency-and-substrate-science\">Efikasnost konverzije i nauka o supstratima<\/h2>\n\n\n\n<p>Efikasnost konverzije je odnos uklonjenih zaga\u0111iva\u010da i unesenih zaga\u0111iva\u010da. Visokou\u010dinkoviti\u00a0<strong><a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">trosmjerni katalizator<\/a><\/strong>\u00a0\u010desto posti\u017ee 98% efikasnosti za CO i HC. Dizajn podloge ovdje igra klju\u010dnu ulogu.<\/p>\n\n\n\n<p>Sa\u0107asta struktura maksimizira povr\u0161inu. Tipi\u010dne podloge imaju 400 do 600 \u0107elija po kvadratnom in\u010du (CPSI). Ve\u0107a gusto\u0107a \u0107elija osigurava ve\u0107u povr\u0161inu za premaz katalizatora. Me\u0111utim, tako\u0111er pove\u0107ava povratni pritisak. In\u017eenjeri moraju uravnote\u017eiti potrebu za povr\u0161inom s potrebom za &#034;disanjem&#034; motora.<\/p>\n\n\n\n<p>&#034;Vrijeme zadr\u017eavanja&#034; je trajanje tokom kojeg ispu\u0161ni plin ostaje unutar katalizatora. Du\u017ee vrijeme zadr\u017eavanja op\u0107enito dovodi do bolje konverzije. Zbog toga pove\u0107anje volumena\u00a0<strong><a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">trosmjerni katalizator<\/a><\/strong>\u00a0poma\u017ee s te\u0161kim gorivima poput B100. Dodavanjem druge cigle udvostru\u010dujete vrijeme koje plin provodi u kontaktu s aktivnim metalima. To osigurava potpunu oksidaciju \u010dak i na ni\u017eim temperaturama.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-7-powerful-ways-substrate-and-coating-boost-performance\/\"><img decoding=\"async\" width=\"1024\" height=\"635\" src=\"https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/11\/Substrate-vs.-Catalyst-Coating-Which-Component-Drives-Three-Way-Catalytic-Converter-Efficiency.jpg\" alt=\"Supstrat u odnosu na premaz katalizatora - koja komponenta uti\u010de na efikasnost trostrukog kataliti\u010dkog konvertora?\" class=\"wp-image-5863\" title=\"\" srcset=\"https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/11\/Substrate-vs.-Catalyst-Coating-Which-Component-Drives-Three-Way-Catalytic-Converter-Efficiency.jpg 1024w, https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/11\/Substrate-vs.-Catalyst-Coating-Which-Component-Drives-Three-Way-Catalytic-Converter-Efficiency-300x186.jpg 300w, https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/11\/Substrate-vs.-Catalyst-Coating-Which-Component-Drives-Three-Way-Catalytic-Converter-Efficiency-768x476.jpg 768w, https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/11\/Substrate-vs.-Catalyst-Coating-Which-Component-Drives-Three-Way-Catalytic-Converter-Efficiency-18x12.jpg 18w, https:\/\/3waycatalyst.com\/wp-content\/uploads\/2025\/11\/Substrate-vs.-Catalyst-Coating-Which-Component-Drives-Three-Way-Catalytic-Converter-Efficiency-600x372.jpg 600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-7-powerful-ways-substrate-and-coating-boost-performance\/\">Supstrat u odnosu na premaz katalizatora - koja komponenta uti\u010de na efikasnost trostrukog kataliti\u010dkog konvertora?<\/a><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"conclusion\">Zaklju\u010dak<\/h2>\n\n\n\n<p>Izbor izme\u0111u DOC-a i\u00a0<strong><a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">trosmjerni katalizator<\/a><\/strong>\u00a0zavisi od specifi\u010dnih ciljeva sistema za emisiju. DOC ostaje isplativ i pouzdan izbor za standardne primjene dizel motora sa siroma\u0161nom smjesom. Dobro se nosi sa organskim dijelom \u010destica i smanjuje miris dizela.<\/p>\n\n\n\n<p>Me\u0111utim,\u00a0<strong><a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">trosmjerni katalizator<\/a><\/strong>\u00a0nudi vrhunsku kontrolu vi\u0161e zaga\u0111iva\u010da. To je jedina tehnologija koja obra\u0111uje NOx, CO i HC u jednoj jedinici. Nadalje, nedavna istra\u017eivanja dokazuju da <a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">TWC<\/a>prilagodljivost. Pove\u0107anjem volumena katalizatora i punjenja PGM-om,<a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\"> TWC<\/a> prevazilazi ograni\u010denja DOC-a u primjeni biodizela. Za potrebe visokih performansi i upotrebu goriva B100,\u00a0<strong><a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">trosmjerni katalizator<\/a><\/strong>\u00a0pru\u017ea robusnije i efikasnije rje\u0161enje. Kako se globalni standardi budu poo\u0161travali, industrija \u0107e vjerovatno vidjeti \u0161iru primjenu <a href=\"https:\/\/3waycatalyst.com\/bs\/three-way-catalytic-converter-twc\/\">TWC<\/a> tehnologija za razli\u010dite tipove motora.<\/p>","protected":false},"excerpt":{"rendered":"<p>Uporedite efikasnost DOC-a i trosmjernog kataliti\u010dkog konvertora. Otkrijte kako TWC pobolj\u0161ava smanjenje i oksidaciju NOx za B100 biodizel u okru\u017eenjima niskih temperatura.<\/p>","protected":false},"author":1,"featured_media":6293,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"googlesitekit_rrm_CAowgdPcCw:productID":"","footnotes":""},"categories":[98],"tags":[1550,1555,1549,479,102,1552,99,1557],"class_list":["post-6290","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guide","tag-b100-biodiesel-oxidation","tag-ceramic-honeycomb-substrate","tag-diesel-oxidation-catalyst-doc","tag-light-off-temperature","tag-nox-reduction","tag-stoichiometric-vs-lean-burn","tag-three-way-catalytic-converter-2","tag-three-way-catalytic-converter-performance"],"_links":{"self":[{"href":"https:\/\/3waycatalyst.com\/bs\/wp-json\/wp\/v2\/posts\/6290","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/3waycatalyst.com\/bs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/3waycatalyst.com\/bs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/3waycatalyst.com\/bs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/3waycatalyst.com\/bs\/wp-json\/wp\/v2\/comments?post=6290"}],"version-history":[{"count":0,"href":"https:\/\/3waycatalyst.com\/bs\/wp-json\/wp\/v2\/posts\/6290\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/3waycatalyst.com\/bs\/wp-json\/wp\/v2\/media\/6293"}],"wp:attachment":[{"href":"https:\/\/3waycatalyst.com\/bs\/wp-json\/wp\/v2\/media?parent=6290"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/3waycatalyst.com\/bs\/wp-json\/wp\/v2\/categories?post=6290"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/3waycatalyst.com\/bs\/wp-json\/wp\/v2\/tags?post=6290"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}