{"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 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\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0958\/5164\/3226\/files\/DOC_Drawing.jpg?v=1754390106\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0958\/5164\/3226\/files\/diesel_oxidation_catalyst.jpg?v=1754294156\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0958\/5164\/3226\/files\/Universal_Diesel_DOC.jpg?v=1754294185\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0958\/5164\/3226\/files\/heavy-duty_DOC.jpg?v=1754294208\" alt=\"\"\u003e\u003c\/p\u003e","brand":"SVIPCAT","offers":[{"title":"50.8 x 50.8 mm \/ (2.0 x 2.0 in) \/ 101 x 110mm \/ 10g\/cft.Pt","offer_id":48699647656185,"sku":null,"price":26.28,"currency_code":"USD","in_stock":true},{"title":"50.8 x 50.8 mm \/ (2.0 x 2.0 in) \/ 101 x 110mm \/ 20g\/cft.Pt","offer_id":48699647688953,"sku":null,"price":35.21,"currency_code":"USD","in_stock":true},{"title":"50.8 x 50.8 mm \/ (2.0 x 2.0 in) \/ 110 x 110mm \/ 10g\/cft.Pt","offer_id":48699647721721,"sku":null,"price":29.55,"currency_code":"USD","in_stock":true},{"title":"50.8 x 50.8 mm \/ (2.0 x 2.0 in) \/ 110 x 110mm \/ 20g\/cft.Pt","offer_id":48699647754489,"sku":null,"price":39.94,"currency_code":"USD","in_stock":true},{"title":"50.8 x 50.8 mm \/ (2.0 x 2.0 in) \/ 120 x 110mm \/ 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