Oxidation-Catalysts

Oxidation-Catalysts are in use with lean-burn and diesel engines, which run with oxygen surplus.

Lean-burn engines can be powered with natural-gas, bio-gas, sewage-gas and landfill-gas.

The exhaust gases of these staionary engines include the following pollutants: CO, HC, und NOx

Since an Oxidations-Catalyst can not reduce NOx (nitric oxide) the required limited rating must be achieved by the right adjustment of the engine.

The Reaction:
CO -----> CO2
HC -----> H2O + CO2 now happens in the Oxidation-Catalyst

Carbon-monoxide (CO) can be reduced well at relatively low temperatures (from 200°C on). Hydrocarbons (HC) need much higher temperatures. With an diesel engine the temperatures should be above 350°C. At natural-gas engines only the non-methan-hydrocarbons can be reduced. Here, temperatures above 450°C are required to achieve reasonable conversion rates.