The catalytic oxidation of hydrocarbons was studied over a large range of equivalence ratio on an automotive oxidation catalyst loaded with Pt. Results show that the light-off temperature depends on the equivalence ratio, type of hydrocarbons, and length of catalyst. The hydrocarbon speciation suggests the occurence of a homogenous mechanism at high temperature and rich equivalence ratio.
Diesel oxidation catalysts of 16 Euro 4 passenger cars were analyzed and tested on an engine bench to attempt to correlate composition and structure to real-life performances. Particular low temperature behavior was evidenced, which was further studied using simplified gas mixtures on a synthetic gas bench. The long chain hydrocarbons are efficiently trapped, while NO 2 plays a major role in CO abatement before the activation of the catalytic oxidation by O 2 .
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