Emission Technology

DOC - Diesel Oxidation Catalyst

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DOC - Diesel Oxidation Catalyst

  • Reduction on Diesel engines

The Diesel Oxidation Catalyst is a "two-way" converters which combined carbon monoxide (CO) and unburned hydrocarbons (HC) to produce carbon dioxide (CO2) and water (H2O).

A two-way (or "oxidation") catalytic converter has two simultaneous tasks:

  • Oxidation of carbon monoxide to carbon dioxide: 2CO + O2 → 2CO2
  • Oxidation of hydrocarbons (unburnt and partially burnt fuel) to carbon dioxide and water: CxH2x+2 + [(3x+1)/2] O2 → xCO2 + (x+1) H2O (a combustion reaction)

Typical Conversion for DOC Diesel Oxidation Catalyst

NOx CO HC Aldehydes (odor causing) PM10*
Nil 70-95% 70-90% 70-90% 10-40%

* Less than 50 ppm sulphur in diesel fuel is required for PM 10 conversion

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