Diesel Oxidation Catalyst DOC catalyst Removal of HC/CO by diesel vehicles and trucks Product Description 1.Oxidation catalyst (DOC) for diesel engine uses platinum (Pt), palladium (Pd), rhodium (Rh) and other precious metals as catalysts. its main purpose is to reduce the COntent of soluble organic components (SOF) in particulate emissions, thereby reducing the emission of particulate matter (PM) and effectively reducing carbon monoxide (co) and hydrocarbons (HC) in exhaust