Study of the origin of the deactivation of a Pt/CeO 2 catalyst during reverse water gas shift (RWGS) reaction

A. Goguet, F. Meunier, J. P. Breen, R. Burch, M. I. Petch, A. Faur Ghenciu

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137 Citations (Scopus)

Abstract

The effect of carbon deposition in the deactivation of a 2% Pt/CeO 2 under RWGS conditions was investigated via an accelerated ageing procedure consisting of measuring the catalyst activity (under 1% CO 2, 4% H 2, 300°C) before and after exposure to CO, CO 2, H 2, or CH 4 at 400°C. Exposure to CO led to severe deactivation while exposure to CO 2, CH 4, or H 2 led to moderate or no deactivation. Additional activity measurements performed before and after exposure to CO followed by subsequent temperature-programmed oxidation (TPO) showed that exposure to increasing amounts of CO led to increased deposits of carbon and deactivation. No evidence for metal sintering was found. Additional TPO following catalyst exposure to RWGS conditions evidenced the deposition of carbonaceous deposits under the RWGS reactant mix.

Original languageEnglish
Pages (from-to)382-392
Number of pages11
JournalJournal of Catalysis
Volume226
Issue number2
DOIs
Publication statusPublished - 10 Sep 2004

Keywords

  • Active site
  • Carbon deposition
  • Ceria
  • Deactivation
  • Pt
  • Reverse water gas shift
  • Temperature-programmed oxidation

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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