High-Performance Diesel Oxidation Catalyst (DOC) for Advanced Exhaust After-Treatment The Diesel Oxidation Catalyst (DOC) is a foundational component in modern emission control systems, specifically designed to regulate and reduce hazardous gaseous emissions from diesel engine exhaust. Operating as a flow-through catalytic converter, it targets carbon monoxide (CO), gaseous hydrocarbons (HC), and the soluble organic fraction (SOF) of particulate matter, converting them into