Steam deactivation of CoZSM-5 NOx reduction catalysts

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Abstract

The effects of high-temperature steam treatment on the activity and selectivity of CoZSM-5 catalysts for the selective catalytic reduction of NO with methane have been examined. Loss of activity and selectivity on steam treatment is due to framework dealumination of the zeolite, causing an irreversible change in the coordination state of the Co2+ ions. Pre exchange of the zeolite with La3+ cations inhibits the dealumination while stabilizing the catalysts.

Original languageEnglish
Pages (from-to)175-179
Number of pages5
JournalCatalysis Today
Volume38
Issue number2
DOIs
Publication statusPublished - 24 Oct 1997

Keywords

  • NOx reduction
  • CoZSM-5
  • steam
  • catalyst stability
  • dealumination
  • selective reduction
  • exchanges ZSM-5
  • lanthanum
  • zeolites
  • dioxide
  • methane
  • oxygen

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