Reduction of lean NO2 with diesel soot over metal-exchanged ZSM5, perovskite and γ-alumina catalysts

Dae Won Lee, Seung Jin Song, Kwan Young Lee

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The catalytic performances of metal-exchanged ZSM5, perovskite and γ-alumina catalysts for the reduction of nitrogen dioxide (NO2) by diesel soot were investigated. The reaction tests were performed through temperature-programmed reaction (TPR), in which NO2 and O2 were passed through a fixed bed of catalyst-soot mixture. On the three types of catalyst, NO2 was reduced to N2 by model soot (Printex-U) and most of the soot was converted into CO2. Pt-, Cu- and Co-exchanged ZSM5 catalysts exhibited reduction activities with conversions of NO2 into N2 of about 20%. Among the perovskite catalysts tested, La0. 9K0. 1FeO3 showed a 32% conversion of NO2 into N2. The catalytic activities of the perovskite catalysts were largely influenced by the number and stability of oxygen vacancies. For the γ-alumina catalyst, the peak reduction activity appeared at a relatively high temperature of around 500 °C, but the NO2 reduction was more effective than the NO reduction, in contrast to the results of the ZSM-5 and perovskite catalysts.

Original languageEnglish
Pages (from-to)452-458
Number of pages7
JournalKorean Journal of Chemical Engineering
Volume27
Issue number2
DOIs
Publication statusPublished - 2010 Mar

Keywords

  • Diesel Soot
  • Perovskite
  • Selective Catalytic Reduction
  • ZSM5
  • γ-Alumina

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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