What is the difference between a diesel oxidation converter (DOC) and a diesel particulate filter (DPF)?
A DOC is classified as a flow-through emissions control unit, having large open channels that allow exhaust gases to pass through unobstructed. Emissions reduction is achieved when exhaust gases interact with the catalyst coating on the channel walls. DOCs are primarily used to reduce carbon monoxide, hydrocarbons and, to a lesser degree, PM. A diesel particulate filter is classified as a wall-flow filter, containing alternating blocked channels that force exhaust gas through its porous walls, capturing PM. Diesel particulate filters are used for the reduction of particulate matter, carbon monoxide and hydrocarbons.
