Comparison of catalytic performance of Ag- and K-based catalysts for diesel soot combustion

Hironobu Shimokawa, Yasuyuki Kurihara, Hajime Kusaba, Hisahiro Einaga, Yasutake Teraoka

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

Soot combustion performance of supported Ag (Ag/TiO 2 and Ag/CeO 2) and K (K/TiO 2 and K/CeO 2) catalysts under tight and loose contact conditions was evaluated by thermogravimetric analysis (TG) and the determination of the apparent activation energy as a function of soot conversion. The soot combustion performance strongly depended on the active species and contact conditions. The soot combustion proceeded by catalytic and non-catalytic combustion processes, depending on the contact conditions and the active species. Almost all the soot was catalytically combusted over Ag and K supported catalysts when they were tightly contacted with the soot, and Ag was more active catalytic species for soot oxidation than K. Under the loose contact condition, the supported K catalyst was superior to the supported Ag catalysts in the fraction of catalytically combusted soot and propagation of the combustion to the non-contact soot. Therefore, the supported K catalyst showed higher performance than the supported Ag catalyst for the removal of the majority of soot under the loose contact condition.

Original languageEnglish
Pages (from-to)99-103
Number of pages5
JournalCatalysis Today
Volume185
Issue number1
DOIs
Publication statusPublished - May 20 2012

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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