Factors affecting the catalytic performance of la-k-mn-o perovskite oxides for diesel soot oxidation

Hironobu Shimokawa, Hajime Kusaba, Hisahiro Einaga, Yasutake Teraoka

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2 Citations (Scopus)

Abstract

Soot combustion performance of K-containing perovskite oxides, La0.8K0.2MnO3 (LKM82), was evaluated under tight- and loose-contact conditions. The perovskite oxides were prepared by evaporation-to-dryness methods using malic acid or citric acid as the complexing reagents. Catalyst surface area, surface K concentration, and morphology of the LKM82 catalysts can be controlled by changing the preparation conditions. The temperature of soot combustion decreased with increasing catalyst surface area and surface K concentration of the LKM82 catalysts, indicating that these are important factors controlling the soot combustion performance. The increase in surface area and surface K concentration of the LKM82 catalysts improved soot ignition activity and promoted the soot combustion reaction after ignition. In the loose-contact mode, the ratio of the amount of catalytically combusted soot to that of non-catalytically combusted soot increased with an increase in catalyst surface area and surface K concentration of the LKM82 catalysts. The apparent activation energy of the catalytic soot combustion with the perovskite oxides that have both high surface area and high surface K concentration was much lower than that of non-catalytic soot combustion.

Original languageEnglish
Pages (from-to)1486-1493
Number of pages8
JournalBulletin of the Chemical Society of Japan
Volume88
Issue number10
DOIs
Publication statusPublished - Jan 1 2015

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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