Abstract
Catalytic performance of perovskite-type ( ABO 3) and K 2NiF 4-type ( A 2 BO 4) oxides for the reduction of NO x by diesel soot particulate in the presence of excess oxygen, that is, the simultaneous removal of NO x and soot, has been investigated. Their catalytic activity, evaluated from the ignition temperature of soot and selectivity to NO x reduction into nitrogen largely depended on both A-site and B-site cations and the partial substitution of potassium at A-sites prominently promoted both the activity and selectivity. These mixed metal oxide catalysts were superior to transition metal simple oxides and Pt/A1 2O 3 in the selectivity for NO x reduction. The ignition temperature of soot in NO + O 2 gas stream was lower than that in NO or O 2 gas stream, implying that nitrogen dioxide accelerates the oxidation or activation of soot.
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