Study on Influence of the Active Site Density to Hydro Carbon Oxidation Reaction in Diesel Oxidation Catalyst

Abstract

The deactivation model of Diesel Oxidation Catalyst (DOC) was investigated on HydroCarbon oxidation test under the low exhaust gas temperature by changing HC species and PGM loading amount. Based on the assumption that the activation energy was independent of the PGM amount, the whole reaction model could be identified considering adsorption, reaction and desorption on the activation site of catalyst. It was found that the influence of PGM loading amount was expressed as the increase of the frequency factor, and that this model suggested the unique mechanism of different reaction behavior in C₃H₆ and C₁₀H₂₂.