114 ENGINE COMPONENT AND LOCATION
Catalytic Filters
W2033360
1. Diesel Oxidation Catalyst
2. Catalyzed Diesel Particulate Filter
A catalytic filter (converter) is a porous form (like a sponge) that has been coated with
a catalytic material. The flow of exhaust gas must pass through the pores on its way to
the atmosphere. As a result, a high percentage of the PM is transformed.
Diesel Oxidation Catalyst
A catalytic filter, the diesel oxidation catalyst (DOC) reduces emissions in diesel
exhaust by an average of approximately one third over a system without a DOC. Its
honeycomb-like structure (called substrate) is coated with an active catalyst. The PM
is changed to carbon dioxide and water. The substrate can be made of a wide range of
materials. Ceramic (cordierite) and sintered metal are common.
Some PM usually remains unconsumed by the heat and collects on the filter.
Eventually, the filter must be taken out to remove the accumulated residue by other
means. There is a special machine to do this cleaning.
Summary of Contents for EPA2007 D13F
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