This paper presents an experimental study on oxidation of diesel paticulate matter (PM) and aims at investigating the characteristics of PM oxidation. The experiments were performed over a Cu0.95K0.05Fe2O4 catalyst which is attributed to a spinel type metal oxide. The effects of O2 on PM oxidation as well as on NOx reduction were studied and the roles of O2 in PM oxidation and in NOx reduction, respectively, are discussed. During the temperature‐programmed oxidation of PM, SOF oxidation and soot oxidation lead to two CO2 peaks at different temperatures. It was found that the presence of O2 benefits PM oxidation but suppresses the reduction of NOx into N2 by consuming the soot. This study revealed that the appearance of PM oxidation is different from that of soot oxidation. The mechanisms on PM oxidation and NOx reduction are discussed.
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Lin et al. (2008) studied this question.
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