Diesel Oxidation

A Diesel Oxidation Catalyst (DOC) is used in diesel engines to reduce harmful pollutants in the exhaust gas primarily HC and CO.

How a DOC Works
  • The DOC contains a ceramic or metallic substrate coated with a catalytic material (usually a combination of platinum, palladium, or rhodium ).
  • As exhaust gases flow through the catalyst, chemical reactions occur that convert harmful pollutants of HC and CO into less harmful substances as CO2 and water (H2O). It also helps oxidize aldehydes and aromatic Compounds to less harmful substances.
  • DOC doesn’t directly reduce PM, however, it can oxidize some soluble organic fractions (SOFs) within the PM, aiding in downstream filtration.
  • DOC does not address nitrogen oxides (NOx).