Comparative study on redox properties of nanosized CeO2 and CuO/CeO2 under CO/O2

A. Martínez-Arias, D. Gamarra, M. Fernández-García, X. Q. Wang, J. C. Hanson, J. A. Rodriguez

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104 Scopus citations

Abstract

Nanosized CeO2 and CuO/CeO2 samples, active for CO-PROX or related processes were comparatively examined by O2 probe electron paramagnetic resonance and in situ Raman and X-ray diffraction techniques. Their behavior toward CO reduction, as well as the oxygen-handling properties of the CO-reduced samples, was explored. An appreciable reduction of the ceria bulk was detected on treatment under CO at 473 K. On the basis of the analysis of the evolution of different oxygen-derived species (superoxide, peroxide, O-) on low-temperature (77-300 K) oxygen chemisorption on the CO-reduced samples, a general picture of the redox properties of the samples is presented. Results demonstrate that the presence of copper promotes completion of the redox cycle under CO/O2 by favoring both ceria reduction and oxidation. This can be relevant to explaining the remarkable oxidation activity and synergetic effects observed for catalysts combining CuO and CeO2.

Original languageEnglish (US)
Pages (from-to)1-7
Number of pages7
JournalJournal of Catalysis
Volume240
Issue number1
DOIs
StatePublished - May 15 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry

Keywords

  • CO Oxidation
  • CO-PROX
  • Catalyst
  • Ceria
  • Copper oxide
  • Electron paramagnetic resonance
  • In situ Raman
  • In situ X-ray diffraction
  • Redox properties
  • Water-gas shift

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