{"title":"DOC (Diesel Oxidation Catalyst) Converters","description":"\u003cp\u003e\u003cspan\u003eExplore our high-performance \u003c\/span\u003e\u003cstrong\u003eDOC (Diesel Oxidation Catalyst) converters\u003c\/strong\u003e\u003cspan\u003e designed to reduce harmful emissions from diesel vehicles. Our durable and efficient catalytic converters help meet environmental regulations while optimizing engine performance. Browse our selection of premium \u003c\/span\u003e\u003cstrong\u003eDOC catalytic converters\u003c\/strong\u003e\u003cspan\u003e for various diesel applications, ensuring cleaner exhaust and compliance with emission standards.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"doc-ceramic-catalyst-for-diesel-vehicles","title":"Diesel Oxidation Catalyst DOC Ceramic\/Cordierite Catalyst for Diesel Vehicles – High-Efficiency Ceramic Catalyst Exhaust Emissions Reduction","description":"\u003cp\u003e\u003cstrong\u003eName analysis\u003c\/strong\u003e\u003cbr\u003eCeramic DOC: refers to a diesel oxidation catalyst (DOC) that uses cordierite (2MgO·2Al₂O₃·5SiO₂) as a carrier material.\u003cbr\u003eCordierite: A ceramic material with a low expansion coefficient, it has excellent thermal stability and low cost characteristics and is currently the most commonly used carrier material for diesel vehicle DOC.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCharacteristics\u003c\/strong\u003e\u003cbr\u003e(1) Material characteristics\u003cbr\u003eHigh temperature resistance: It can withstand continuous high temperatures of 800~1000°C and withstand 1200°C for a short time (but long-term high temperatures may cause sintering failure).\u003cbr\u003eLow thermal expansion coefficient: The thermal expansion coefficient is low (~1×10⁻⁶\/°C), and the thermal shock resistance is good, avoiding cracking due to sudden temperature changes.\u003cbr\u003ePorous structure: The surface is coated with γ-alumina (γ-Al₂O₃) to increase the specific surface area and load precious metal catalysts such as platinum (Pt) and palladium (Pd).\u003c\/p\u003e\n\u003cp\u003e(2) Structural characteristics\u003cbr\u003eHoneycomb carrier: usually adopts a honeycomb structure of 400-600 CPSI (pores per square inch) to balance airflow distribution and back pressure\u003cbr\u003eLightweight: low density (about 2.0 g\/cm³), lighter than metal DOC.\u003c\/p\u003e\n\u003cp\u003e(3) Environmental adaptability\u003cbr\u003eChemical corrosion resistance: good tolerance to diesel sulfur content (under low sulfur fuel conditions), but long-term exposure to high sulfur environment may cause poisoning.\u003cbr\u003eModerate mechanical strength: more brittle than metal DOC, need to avoid severe vibration or impact.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003cbr\u003e(1) Core function (oxidation reaction)\u003cbr\u003eCO oxidation: carbon monoxide (CO) → carbon dioxide (CO₂).\u003cbr\u003eHC oxidation: unburned hydrocarbons (HC) → water (H₂O) + CO₂.\u003cbr\u003eSOF conversion: soluble organic matter (SOF, part of particulate matter PM) → reduction of PM emissions.\u003cbr\u003eNO oxidation: partial nitrogen monoxide (NO) → nitrogen dioxide (NO₂), assisting DPF passive regeneration (NO₂ + soot → CO₂ + N₂).\u003c\/p\u003e\n\u003cp\u003e(2) Auxiliary functions\u003cbr\u003eReducing exhaust odor: oxidizing sulfur and nitrogen compounds to reduce the pungent odor unique to diesel vehicles.\u003cbr\u003eProtecting downstream systems: reducing the impact of unburned HC on the SCR catalyst.\u003c\/p\u003e\n\u003cstyle\u003e\ntable {\n  border-collapse: collapse;\n  width: 100%;\n  max-width: 800px;\n  margin: 20px auto;\n  font-family: Arial, sans-serif;\n}\n\nth, td {\n  border: 1px solid #dddddd;\n  text-align: left;\n  padding: 12px;\n}\n\nth {\n  background-color: #f2f2f2;\n  font-weight: bold;\n}\n\ntr:nth-child(even) {\n  background-color: #f9f9f9;\n}\n\u003c\/style\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAdvantage\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow cost\u003c\/td\u003e\n\u003ctd\u003eCordierite material and manufacturing process are mature, with prices significantly lower than metal DOC and silicon carbide 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which is different from the traditional ceramic carrier (such as cordierite).\u003cbr\u003eDOC: Diesel Oxidation Catalyst, which reduces harmful pollutants in exhaust gas through oxidation reaction.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCharacteristics\u003c\/strong\u003e\u003cbr\u003eMaterial characteristics:\u003cbr\u003eMetal substrate: usually adopts high temperature resistant alloy (such as iron chromium aluminum fiber), with high mechanical strength and impact resistance.\u003cbr\u003eCoating: The surface is coated with active catalytic materials (such as platinum, palladium and other precious metals) to promote oxidation reaction.\u003cbr\u003eStructural characteristics:\u003cbr\u003eHigh porosity design: The metal carrier can be made into a thinner wall and denser honeycomb structure to reduce back pressure.\u003cbr\u003eQuick ignition: Metal has good thermal conductivity and can quickly reach the temperature required for catalytic reaction.\u003cbr\u003eEnvironmental adaptability:\u003cbr\u003eHigh temperature resistance (up to 1000°C or more), better thermal shock resistance than ceramic carrier.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFunctions\u003c\/strong\u003e\u003cbr\u003eCore functions: Convert harmful components in exhaust gas through catalytic oxidation reactions:\u003cbr\u003eHydrocarbons (HC) → Oxidized to H₂O and CO₂.\u003cbr\u003eCarbon monoxide (CO) → Oxidized to CO₂.\u003cbr\u003eParticulate matter (PM): Some soluble organic matter (SOF) is oxidized to reduce PM emissions.\u003cbr\u003eNO: A small amount of NO is oxidized to NO₂ (to provide support for subsequent SCR or DPF regeneration).\u003cbr\u003eAuxiliary functions:\u003cbr\u003eProvide NO₂ to DPF (diesel particulate filter) to promote passive regeneration (NO₂ oxidizes soot particles).\u003cbr\u003eReduce exhaust odor (oxidized sulfides, etc.).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdvantages\u003c\/strong\u003e\u003cbr\u003ePerformance advantages:\u003cbr\u003eHigh efficiency and low temperature activity: Metal has fast thermal conductivity and ignites faster during cold start (especially in short-distance driving in cities).\u003cbr\u003eLow back pressure: The flow channel design of the metal carrier is more flexible, reducing engine power loss.\u003cbr\u003eLong life: Resistant to mechanical vibration and thermal shock, suitable for harsh working conditions (such as construction machinery and commercial vehicles).\u003c\/p\u003e\n\u003cp\u003eApplication advantages:\u003cbr\u003eCompact design: The metal carrier can be made into a special-shaped structure to adapt to vehicles with limited space.\u003cbr\u003eStrong compatibility: It can be integrated with post-treatment systems such as SCR and DPF.\u003cbr\u003eMaintenance advantages:\u003cbr\u003eNot easy to break, strong resistance to sulfur poisoning (depending on the catalyst formula).\u003c\/p\u003e","brand":"SVIPCAT","offers":[{"title":"293x100mm \/ 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withstand high temperatures above 1000°C for a long time, and instantaneous temperature resistance can reach 1400°C (better than cordierite ceramics).\u003cbr\u003eHigh thermal conductivity: The thermal conductivity is more than 5 times that of cordierite, and the heat distribution is uniform, reducing the risk of local overheating.\u003cbr\u003eChemical inertness: Resistant to acid and alkali corrosion, and resistant to common poisons in exhaust gas such as sulfur and phosphorus.\u003c\/p\u003e\n\u003cp\u003eStructural characteristics:\u003cbr\u003ePorous structure: The surface of the carrier is coated with a high specific surface area alumina coating, loaded with precious metal catalysts such as platinum (Pt) and palladium (Pd).\u003cbr\u003eLow thermal expansion coefficient: not easy to crack at high temperature, excellent thermal shock resistance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003cbr\u003eCore function:\u003cbr\u003eOxidation of 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catalysis:\u003cbr\u003eHigh thermal conductivity enables the catalyst to quickly reach the operating temperature, improving the conversion efficiency during the cold start phase.\u003cbr\u003eSystem compatibility:\u003cbr\u003eCan be integrated with post-treatment systems such as DPF and SCR, especially suitable for DPF systems that require high-temperature regeneration.\u003cbr\u003eEnvironmental protection:\u003cbr\u003eReduce the risk of precious metal leakage due to carrier failure (silicon carbide carrier is more stable).\u003c\/p\u003e","brand":"SVIPCAT","offers":[{"title":"144*100mm \/ 10g\/cft.Pt","offer_id":51704087576922,"sku":null,"price":56.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/5164\/3226\/files\/doc-silicon-carbide-diesel-catalyst.jpg?v=1753336090"},{"product_id":"universal-diesel-doc-catalytic-280mm","title":"Universal DOC Ceramic Honeycomb Catalyst Diesel Vehicle Catalytic Converter Total Length 280mm","description":"\u003cp\u003e\u003cstrong\u003eName analysis\u003c\/strong\u003e\u003cbr\u003eCeramic DOC: refers to a diesel oxidation catalyst (DOC) that uses cordierite (2MgO·2Al₂O₃·5SiO₂) as a carrier material.\u003cbr\u003eCordierite: A ceramic material with a low expansion coefficient, it has excellent thermal stability and low cost characteristics and is currently the most commonly used carrier material for diesel vehicle DOC.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCharacteristics\u003c\/strong\u003e\u003cbr\u003e(1) Material characteristics\u003cbr\u003eHigh temperature resistance: It can withstand continuous high temperatures of 800~1000°C and withstand 1200°C for a short time (but long-term high temperatures may cause sintering failure).\u003cbr\u003eLow thermal expansion coefficient: The thermal expansion coefficient is low (~1×10⁻⁶\/°C), and the thermal shock resistance is good, avoiding cracking due to sudden temperature changes.\u003cbr\u003ePorous structure: The surface is coated with γ-alumina (γ-Al₂O₃) to increase the specific surface area and load precious metal catalysts such as platinum (Pt) and palladium (Pd).\u003c\/p\u003e\n\u003cp\u003e(2) Structural characteristics\u003cbr\u003eHoneycomb carrier: usually adopts a honeycomb structure of 400-600 CPSI (pores per square inch) to balance airflow distribution and back pressure\u003cbr\u003eLightweight: low density (about 2.0 g\/cm³), lighter than metal DOC.\u003c\/p\u003e\n\u003cp\u003e(3) Environmental adaptability\u003cbr\u003eChemical corrosion resistance: good tolerance to diesel sulfur content (under low sulfur fuel conditions), but long-term exposure to high sulfur environment may cause poisoning.\u003cbr\u003eModerate mechanical strength: more brittle than metal DOC, need to avoid severe vibration or impact.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003cbr\u003e(1) Core function (oxidation reaction)\u003cbr\u003eCO oxidation: carbon monoxide (CO) → carbon dioxide (CO₂).\u003cbr\u003eHC oxidation: unburned hydrocarbons (HC) → water (H₂O) + CO₂.\u003cbr\u003eSOF conversion: soluble organic matter (SOF, part of particulate matter PM) → reduction of PM emissions.\u003cbr\u003eNO oxidation: partial nitrogen monoxide (NO) → nitrogen dioxide (NO₂), assisting DPF passive regeneration (NO₂ + soot → CO₂ + N₂).\u003c\/p\u003e\n\u003cp\u003e(2) Auxiliary functions\u003cbr\u003eReducing exhaust odor: oxidizing sulfur and nitrogen compounds to reduce the pungent odor unique to diesel vehicles.\u003cbr\u003eProtecting downstream systems: reducing the impact of unburned HC on the SCR catalyst.\u003c\/p\u003e\n\u003cstyle\u003e\ntable {\n  border-collapse: collapse;\n  width: 100%;\n  max-width: 800px;\n  margin: 20px auto;\n  font-family: Arial, sans-serif;\n}\n\nth, td {\n  border: 1px solid #dddddd;\n  text-align: left;\n  padding: 12px;\n}\n\nth {\n  background-color: #f2f2f2;\n  font-weight: bold;\n}\n\ntr:nth-child(even) {\n  background-color: #f9f9f9;\n}\n\u003c\/style\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAdvantage\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow cost\u003c\/td\u003e\n\u003ctd\u003eCordierite material and manufacturing process are mature, with prices significantly lower than metal DOC and silicon carbide DOC.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLightweight\u003c\/td\u003e\n\u003ctd\u003eLighter than metal DOC, suitable for passenger cars and light commercial vehicles.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow backpressure\u003c\/td\u003e\n\u003ctd\u003eHoneycomb structure optimizes airflow, reducing engine power loss.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFast light-off\u003c\/td\u003e\n\u003ctd\u003eCatalyst coating can reach operating temperature quickly during cold start (though not as fast as metal 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DOC.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCharacteristics\u003c\/strong\u003e\u003cbr\u003e(1) Material characteristics\u003cbr\u003eHigh temperature resistance: It can withstand continuous high temperatures of 800~1000°C and withstand 1200°C for a short time (but long-term high temperatures may cause sintering failure).\u003cbr\u003eLow thermal expansion coefficient: The thermal expansion coefficient is low (~1×10⁻⁶\/°C), and the thermal shock resistance is good, avoiding cracking due to sudden temperature changes.\u003cbr\u003ePorous structure: The surface is coated with γ-alumina (γ-Al₂O₃) to increase the specific surface area and load precious metal catalysts such as platinum (Pt) and palladium (Pd).\u003c\/p\u003e\n\u003cp\u003e(2) Structural characteristics\u003cbr\u003eHoneycomb carrier: usually adopts a honeycomb structure of 400-600 CPSI (pores per square inch) to balance airflow distribution and back pressure\u003cbr\u003eLightweight: low density (about 2.0 g\/cm³), lighter than metal DOC.\u003c\/p\u003e\n\u003cp\u003e(3) Environmental adaptability\u003cbr\u003eChemical corrosion resistance: good tolerance to diesel sulfur content (under low sulfur fuel conditions), but long-term exposure to high sulfur environment may cause poisoning.\u003cbr\u003eModerate mechanical strength: more brittle than metal DOC, need to avoid severe vibration or impact.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003cbr\u003e(1) Core function (oxidation reaction)\u003cbr\u003eCO oxidation: carbon monoxide (CO) → carbon dioxide (CO₂).\u003cbr\u003eHC oxidation: unburned hydrocarbons (HC) → water (H₂O) + CO₂.\u003cbr\u003eSOF conversion: soluble organic matter (SOF, part of particulate matter PM) → reduction of PM emissions.\u003cbr\u003eNO oxidation: partial nitrogen monoxide (NO) → nitrogen dioxide (NO₂), assisting DPF passive regeneration (NO₂ + soot → CO₂ + N₂).\u003c\/p\u003e\n\u003cp\u003e(2) Auxiliary functions\u003cbr\u003eReducing exhaust odor: oxidizing sulfur and nitrogen compounds to reduce the pungent odor unique to diesel vehicles.\u003cbr\u003eProtecting downstream systems: reducing the impact of unburned HC on the SCR catalyst.\u003c\/p\u003e\n\u003cstyle\u003e\ntable {\n  border-collapse: collapse;\n  width: 100%;\n  max-width: 800px;\n  margin: 20px auto;\n  font-family: Arial, sans-serif;\n}\n\nth, td {\n  border: 1px solid #dddddd;\n  text-align: left;\n  padding: 12px;\n}\n\nth {\n  background-color: #f2f2f2;\n  font-weight: bold;\n}\n\ntr:nth-child(even) {\n  background-color: #f9f9f9;\n}\n\u003c\/style\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAdvantage\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow cost\u003c\/td\u003e\n\u003ctd\u003eCordierite material and manufacturing process are mature, with prices significantly lower than metal DOC and silicon carbide 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platinum (Pt) and palladium (Pd).\u003c\/p\u003e\n\u003cp\u003e(2) Structural characteristics\u003cbr\u003eHoneycomb carrier: usually adopts a honeycomb structure of 400-600 CPSI (pores per square inch) to balance airflow distribution and back pressure\u003cbr\u003eLightweight: low density (about 2.0 g\/cm³), lighter than metal DOC.\u003c\/p\u003e\n\u003cp\u003e(3) Environmental adaptability\u003cbr\u003eChemical corrosion resistance: good tolerance to diesel sulfur content (under low sulfur fuel conditions), but long-term exposure to high sulfur environment may cause poisoning.\u003cbr\u003eModerate mechanical strength: more brittle than metal DOC, need to avoid severe vibration or impact.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003cbr\u003e(1) Core function (oxidation reaction)\u003cbr\u003eCO oxidation: carbon monoxide (CO) → carbon dioxide (CO₂).\u003cbr\u003eHC oxidation: unburned hydrocarbons (HC) → water (H₂O) + CO₂.\u003cbr\u003eSOF conversion: soluble organic matter (SOF, part of particulate matter PM) → reduction of PM emissions.\u003cbr\u003eNO oxidation: partial nitrogen monoxide (NO) → nitrogen dioxide (NO₂), assisting DPF passive regeneration (NO₂ + soot → CO₂ + N₂).\u003c\/p\u003e\n\u003cp\u003e(2) Auxiliary functions\u003cbr\u003eReducing exhaust odor: oxidizing sulfur and nitrogen compounds to reduce the pungent odor unique to diesel vehicles.\u003cbr\u003eProtecting downstream systems: reducing the impact of unburned HC on the SCR catalyst.\u003c\/p\u003e\n\u003cstyle\u003e\ntable {\n  border-collapse: collapse;\n  width: 100%;\n  max-width: 800px;\n  margin: 20px auto;\n  font-family: Arial, sans-serif;\n}\n\nth, td {\n  border: 1px solid #dddddd;\n  text-align: left;\n  padding: 12px;\n}\n\nth {\n  background-color: #f2f2f2;\n  font-weight: bold;\n}\n\ntr:nth-child(even) {\n  background-color: #f9f9f9;\n}\n\u003c\/style\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAdvantage\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow cost\u003c\/td\u003e\n\u003ctd\u003eCordierite material and manufacturing process are mature, with prices significantly lower than metal DOC and silicon carbide DOC.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLightweight\u003c\/td\u003e\n\u003ctd\u003eLighter than metal DOC, suitable for passenger cars and light commercial vehicles.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow backpressure\u003c\/td\u003e\n\u003ctd\u003eHoneycomb structure optimizes airflow, reducing engine power loss.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFast light-off\u003c\/td\u003e\n\u003ctd\u003eCatalyst coating can reach operating temperature quickly during cold start (though not as fast as metal DOC).\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWide applicability\u003c\/td\u003e\n\u003ctd\u003eComplies with mainstream emission standards like Euro 5\/6, suitable for most diesel vehicles.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"SVIPCAT","offers":[{"title":"140 x 110mm \/ 10g\/cft.Pt","offer_id":51812940710234,"sku":null,"price":41.0,"currency_code":"GBP","in_stock":true},{"title":"140 x 110mm \/ 20g\/cft.Pt","offer_id":51812940743002,"sku":null,"price":58.0,"currency_code":"GBP","in_stock":true},{"title":"154 x 80mm \/ 10g\/cft.Pt","offer_id":51812940775770,"sku":null,"price":39.0,"currency_code":"GBP","in_stock":true},{"title":"154 x 80mm \/ 20g\/cft.Pt","offer_id":51812940808538,"sku":null,"price":54.0,"currency_code":"GBP","in_stock":true},{"title":"154 x 110mm \/ 10g\/cft.Pt","offer_id":51812940841306,"sku":null,"price":50.0,"currency_code":"GBP","in_stock":true},{"title":"154 x 110mm \/ 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low expansion coefficient, it has excellent thermal stability and low cost characteristics and is currently the most commonly used carrier material for diesel vehicle DOC.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCharacteristics\u003c\/strong\u003e\u003cbr\u003e(1) Material characteristics\u003cbr\u003eHigh temperature resistance: It can withstand continuous high temperatures of 800~1000°C and withstand 1200°C for a short time (but long-term high temperatures may cause sintering failure).\u003cbr\u003eLow thermal expansion coefficient: The thermal expansion coefficient is low (~1×10⁻⁶\/°C), and the thermal shock resistance is good, avoiding cracking due to sudden temperature changes.\u003cbr\u003ePorous structure: The surface is coated with γ-alumina (γ-Al₂O₃) to increase the specific surface area and load precious metal catalysts such as platinum (Pt) and palladium (Pd).\u003c\/p\u003e\n\u003cp\u003e(2) Structural characteristics\u003cbr\u003eHoneycomb carrier: usually adopts a honeycomb structure of 400-600 CPSI (pores per square inch) to balance airflow distribution and back pressure\u003cbr\u003eLightweight: low density (about 2.0 g\/cm³), lighter than metal DOC.\u003c\/p\u003e\n\u003cp\u003e(3) Environmental adaptability\u003cbr\u003eChemical corrosion resistance: good tolerance to diesel sulfur content (under low sulfur fuel conditions), but long-term exposure to high sulfur environment may cause poisoning.\u003cbr\u003eModerate mechanical strength: more brittle than metal DOC, need to avoid severe vibration or impact.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003cbr\u003e(1) Core function (oxidation reaction)\u003cbr\u003eCO oxidation: carbon monoxide (CO) → carbon dioxide (CO₂).\u003cbr\u003eHC oxidation: unburned hydrocarbons (HC) → water (H₂O) + CO₂.\u003cbr\u003eSOF conversion: soluble organic matter (SOF, part of particulate matter PM) → reduction of PM emissions.\u003cbr\u003eNO oxidation: partial nitrogen monoxide (NO) → nitrogen dioxide (NO₂), assisting DPF passive regeneration (NO₂ + soot → CO₂ + N₂).\u003c\/p\u003e\n\u003cp\u003e(2) Auxiliary functions\u003cbr\u003eReducing exhaust odor: oxidizing sulfur and nitrogen compounds to reduce the pungent odor unique to diesel vehicles.\u003cbr\u003eProtecting downstream systems: reducing the impact of unburned HC on the SCR catalyst.\u003c\/p\u003e\n\u003cstyle\u003e\ntable {\n  border-collapse: collapse;\n  width: 100%;\n  max-width: 800px;\n  margin: 20px auto;\n  font-family: Arial, sans-serif;\n}\n\nth, td {\n  border: 1px solid #dddddd;\n  text-align: left;\n  padding: 12px;\n}\n\nth {\n  background-color: #f2f2f2;\n  font-weight: bold;\n}\n\ntr:nth-child(even) {\n  background-color: #f9f9f9;\n}\n\u003c\/style\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAdvantage\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow cost\u003c\/td\u003e\n\u003ctd\u003eCordierite material and manufacturing process are mature, with prices significantly lower than metal DOC and silicon carbide DOC.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLightweight\u003c\/td\u003e\n\u003ctd\u003eLighter than metal DOC, suitable for passenger cars and light commercial vehicles.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow backpressure\u003c\/td\u003e\n\u003ctd\u003eHoneycomb structure optimizes airflow, reducing engine power loss.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFast light-off\u003c\/td\u003e\n\u003ctd\u003eCatalyst coating can reach operating temperature quickly during cold start (though not as fast as metal DOC).\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWide applicability\u003c\/td\u003e\n\u003ctd\u003eComplies with mainstream emission standards like Euro 5\/6, suitable for most diesel 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DOC.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCharacteristics\u003c\/strong\u003e\u003cbr\u003e(1) Material characteristics\u003cbr\u003eHigh temperature resistance: It can withstand continuous high temperatures of 800~1000°C and withstand 1200°C for a short time (but long-term high temperatures may cause sintering failure).\u003cbr\u003eLow thermal expansion coefficient: The thermal expansion coefficient is low (~1×10⁻⁶\/°C), and the thermal shock resistance is good, avoiding cracking due to sudden temperature changes.\u003cbr\u003ePorous structure: The surface is coated with γ-alumina (γ-Al₂O₃) to increase the specific surface area and load precious metal catalysts such as platinum (Pt) and palladium (Pd).\u003c\/p\u003e\n\u003cp\u003e(2) Structural characteristics\u003cbr\u003eHoneycomb carrier: usually adopts a honeycomb structure of 400-600 CPSI (pores per square inch) to balance airflow distribution and back pressure\u003cbr\u003eLightweight: low density (about 2.0 g\/cm³), lighter than metal DOC.\u003c\/p\u003e\n\u003cp\u003e(3) Environmental adaptability\u003cbr\u003eChemical corrosion resistance: good tolerance to diesel sulfur content (under low sulfur fuel conditions), but long-term exposure to high sulfur environment may cause poisoning.\u003cbr\u003eModerate mechanical strength: more brittle than metal DOC, need to avoid severe vibration or impact.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003cbr\u003e(1) Core function (oxidation reaction)\u003cbr\u003eCO oxidation: carbon monoxide (CO) → carbon dioxide (CO₂).\u003cbr\u003eHC oxidation: unburned hydrocarbons (HC) → water (H₂O) + CO₂.\u003cbr\u003eSOF conversion: soluble organic matter (SOF, part of particulate matter PM) → reduction of PM emissions.\u003cbr\u003eNO oxidation: partial nitrogen monoxide (NO) → nitrogen dioxide (NO₂), assisting DPF passive regeneration (NO₂ + soot → CO₂ + N₂).\u003c\/p\u003e\n\u003cp\u003e(2) Auxiliary functions\u003cbr\u003eReducing exhaust odor: oxidizing sulfur and nitrogen compounds to reduce the pungent odor unique to diesel vehicles.\u003cbr\u003eProtecting downstream systems: reducing the impact of unburned HC on the SCR catalyst.\u003c\/p\u003e\n\u003cstyle\u003e\ntable {\n  border-collapse: collapse;\n  width: 100%;\n  max-width: 800px;\n  margin: 20px auto;\n  font-family: Arial, sans-serif;\n}\n\nth, td {\n  border: 1px solid #dddddd;\n  text-align: left;\n  padding: 12px;\n}\n\nth {\n  background-color: #f2f2f2;\n  font-weight: bold;\n}\n\ntr:nth-child(even) {\n  background-color: #f9f9f9;\n}\n\u003c\/style\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAdvantage\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow cost\u003c\/td\u003e\n\u003ctd\u003eCordierite material and manufacturing process are mature, with prices significantly lower than metal DOC and silicon carbide 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#f9f9f9;\n}\n\u003c\/style\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAdvantage\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow cost\u003c\/td\u003e\n\u003ctd\u003eCordierite material and manufacturing process are mature, with prices significantly lower than metal DOC and silicon carbide DOC.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLightweight\u003c\/td\u003e\n\u003ctd\u003eLighter than metal DOC, suitable for passenger cars and light commercial vehicles.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow backpressure\u003c\/td\u003e\n\u003ctd\u003eHoneycomb structure optimizes airflow, reducing engine power loss.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFast light-off\u003c\/td\u003e\n\u003ctd\u003eCatalyst coating can reach operating temperature quickly during cold start (though not as fast as metal 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