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Simultaneous catalytic removal of nitrogen oxides and diesel soot particulate over perovskite-related oxides

โœ Scribed by Yasutake Teraoka; Koji Nakano; Wenfeng Shangguan; Shuichi Kagawa

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
471 KB
Volume
27
Category
Article
ISSN
0920-5861

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โœฆ Synopsis

Catalytic performance of perovskite-type (ABO3) and K2NiF4-type (A2BO4) oxides for the reduction of NOx by diesel soot particulate in the presence of excess oxygen, that is, the simultaneous removal of NOx and soot, has been investigated. Their catalytic activity, evaluated from the ignition temperature of soot and selectivity to NOx 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/A1203 in the selectivity for NOx reduction. The ignition temperature of soot in NO + 02 gas stream was lower than that in NO or 02 gas stream, implying that nitrogen dioxide accelerates the oxidation or activation of soot.

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