Diesel Oxidation Catalysts (DOC)

Diesel Oxidation Catalyst CPSI/MIL Diameters Material CTE
(x 10-6/ºC,
RT-800 ºC)
Porosity % Specific Weight (g/in3)
Standard Wall Diesel Substrate 300/8 7" - 13" Cordierite 1.0 35 6.87
Standard Wall Diesel Substrate 400/7 7" - 13" Cordierite 1.0 35 6.93
Thin Wall Diesel Substrate 400/4 7" - 13" Cordierite 1.0 35 4.57
Thin Wall Diesel Substrate 300/5 7" - 13" Cordierite 1.0 35 4.82

Diesel Oxidation Catalysts (DOC) Diesel Oxidation Catalysts are helping vehicle and equipment manufacturers worldwide meet tightening federal and local diesel emissions standards.

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Advanced Engineering
The Diesel Oxidation Catalyst (DOC), or Two-Way Catalyst, owes its name to its ability to promote oxidation of several exhaust gas components by oxygen, which is present in ample quantities in diesel exhaust. Offering lower backpressure and higher geometric surface area in a large frontal area (LFA) monolithic substrate, these advanced substrates help enhance system performance. When passed over an oxidation catalyst, the following diesel pollutants can be oxidized to harmless products, and thus can be controlled using the DOC:

     – carbon monoxide (CO)
     – gas phase hydrocarbons (HC)
     – organic fraction of diesel particulates (SOF)

Additional benefits of the DOC include oxidation of several non-regulated, HC-derived emissions, such as aldehydes or PAHs, as well as reduction or elimination of the odor of diesel exhaust. The emission reductions in the DOC occur through chemical oxidation of pollutants occurring over the active catalytic sites. These processes can be described by the following chemical reactions:

Diesel Oxidation Catalysts (DOC) (1) [Hydrocarbons] + O2 = CO2 + H2O
(1a) CnH2m + (n + m/2)O2 = nCO2 + mH2O
(2) CO + 1/2O2 = CO2