DeNOx reactions on Cu-zeolites: Decomposition of NO, N2O and SCR of NO by C3H8 and CH4 on Cu-ZSM-5 and Cu-AlTS-1 catalysts

Z. Schay, L. Guczi, A. Beck, I. Nagy, V. Samuel, S. P. Mirajkar, A. V. Ramaswamy, G. Pál-Borbély

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34 Citations (Scopus)

Abstract

Cu-ZSM-5 and Cu-AlTS-1 catalysts were prepared by solid state ion exchange and studied in DeNOx reactions. A NO3 type surface complex was found to be an active intermediate in the decomposition of NO and N2O. Copper was oxidized to Cu2+ in the decomposition reactions. Oscillations at full N2O conversion were observed in the gas phase O2 concentration, without any change in the N2 concentration. The oscillation was synchronized by gas phase NO formed from the NO3 complex. The same complex seems to be an active intermediate also in NO selective catalytic reduction (SCR) by methane, whereas carbonaceous deposits play a role in NO SCR by propane. TPD reveals that only 10-20% of the total copper in the zeolites participates in the catalytic cycles.

Original languageEnglish
Pages (from-to)393-399
Number of pages7
JournalCatalysis Today
Volume75
Issue number1-4
DOIs
Publication statusPublished - Jul 3 2002

Keywords

  • NO
  • NO
  • Oscillations
  • SCR
  • Transients
  • Zeolite

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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