Diesel oxidation catalysts (DOC)

Diesel oxidation catalysts (DOC) are installed downstream of dual-fuel or diesel engines
with an overstoichiometric air/fuel ratio (lambda λ >1) and residual oxygen (O2) in the exhaust gas.

The following reactions take place on the diesel oxidation catalyst:

Over 90% of the carbon monoxide (CO) is converted into carbon dioxide (CO2). Up to 90% of hydrocarbons (HC) are converted into carbon dioxide (CO2) and water (H2O)


As a rule, our catalyst supports are coated exclusively with platinum. However, there are some special applications that necessitate coating of our catalysts with other precious metals, such as palladium or a mixture of different active materials.
One example is our special exothermic pre-filter, which is used in our HC-Power systems to enable oxidation of the additional hydrocarbons (HC) contained within the exhaust gas. This causes an increase in the exhaust gas temperature, which is conducive to particulate filter regeneration.