ディテール
規格番号:DOC000-1
製品ディテール
A Diesel Oxidation Catalyst (DOC) is a critical emissions control device designed for diesel engines, focusing on reducing harmful pollutants in exhaust gases. It operates as a core component of diesel aftertreatment systems, leveraging catalytic reactions to convert toxic substances into environmentally friendly compounds.
The DOC consists of a catalyst-coated substrate (typically cordierite, silicon carbide, or metal) and an outer sealing casing. The catalyst—usually platinum (Pt), palladium (Pd), or a combination—triggers oxidation reactions at optimal temperatures (200-400°C), converting carbon monoxide (CO) to carbon dioxide (CO₂), unburned hydrocarbons (HC) to CO₂ and water (H₂O), and oxidizing some particulate matter (PM) precursors.
Widely used in diesel-powered vehicles (cars, trucks, buses), construction machinery, generators, and marine vessels, DOCs play a key role in meeting global emission standards such as Euro 4/5/6, EPA, and China VI. They often work in tandem with other aftertreatment devices like DPF (Diesel Particulate Filter) or SCR (Selective Catalytic Reduction) for comprehensive pollutant control, ensuring efficient and compliant operation of diesel engines.
Basic Information
- What is a Diesel Oxidation Catalyst (DOC)?It is an emissions control device for diesel engines that oxidizes harmful pollutants (CO, unburned hydrocarbons) into harmless CO₂ and water.
- How does a DOC work?It uses a catalyst (typically platinum, palladium) on a ceramic/metal substrate to trigger chemical reactions, converting pollutants at high exhaust temperatures.
- What are the core components of a DOC?Key parts include a catalyst-coated substrate (cordierite/SiC/metal), outer casing, and gaskets for exhaust sealing.
Application & Function
- Which vehicles/equipment use DOCs?Diesel-powered cars, trucks, buses, construction machinery, generators, and marine vessels.
- What pollutants does a DOC reduce?It targets carbon monoxide (CO), unburned hydrocarbons (HC), and some particulate matter (PM) precursors.
- Can a DOC work alone or with other aftertreatment devices?It often works with DPF (Diesel Particulate Filter) or SCR (Selective Catalytic Reduction) for comprehensive emissions control.
Usage & Maintenance
- What operating temperature does a DOC require?Optimal temperature range: 200-400°C; it needs sufficient exhaust heat to activate the catalyst.
- How to maintain a DOC?Use high-quality diesel fuel and engine oil; avoid engine misfires (causes overheating); prevent catalyst poisoning from sulfur or additives.
- What are common causes of DOC failure?Catalyst poisoning, thermal degradation (excessive temperatures), soot clogging, or physical damage to the substrate.
Performance & Specifications
- What is the typical conversion efficiency of a DOC?Can achieve ≥90% conversion for CO and HC under normal operating conditions.
- What is the service life of a DOC?Generally 100,000-250,000 km (varies by engine type, fuel quality, and operating conditions).
- Are DOCs compliant with emission standards?Yes. They meet global standards like Euro 4/5/6, EPA, and China VI for diesel engine emissions.