Redox and catalytic properties of CuO/CeO 2 under CO + O 2 + NO: Promoting effect of NO on CO oxidation

A. Martínez-Arias*, A. B. Hungría, A. Iglesias-Juez, M. Fernández-García, J. A. Anderson, J. C. Conesa, G. Munuera, J. Soria

*Corresponding author for this work

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18 Citations (Scopus)

Abstract

A CuO/CeO 2 catalyst has been studied with respect to its catalytic activity for CO oxidation under stoichiometric conditions employing either O 2 or O 2-NO mixture as oxidants. The obtained results are rationalised on the basis of analysis of redox properties upon interaction with CO and O 2-NO by EPR as well as by redox/catalytic analysis by operando-DRIFTS. These provide useful insight into the processes involved during NO reduction, for which two well differentiated steps associated to a change in the type of active centres during the course of the reaction are evidenced. Nevertheless, the most interesting result is related to observation of a novel promoting effect of NO on CO oxidation. This is explained mainly on the basis of DRIFTS results and appears to be associated with phenomena of adsorption/desorption of NO x species at interfacial positions which apparently activate such interfacial region allowing formation of greater amounts of active reduced copper centres in the presence of NO.

Original languageEnglish
Pages (from-to)81-87
Number of pages7
JournalCatalysis Today
Volume180
Issue number1
Early online date9 Mar 2011
DOIs
Publication statusPublished - 17 Jan 2012

Keywords

  • Ceria-based catalysts
  • CO oxidation
  • Copper oxide
  • Cu and O EPR
  • Nitric oxide reduction
  • Operando-DRIFTS

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    Martínez-Arias, A., Hungría, A. B., Iglesias-Juez, A., Fernández-García, M., Anderson, J. A., Conesa, J. C., Munuera, G., & Soria, J. (2012). Redox and catalytic properties of CuO/CeO 2 under CO + O 2 + NO: Promoting effect of NO on CO oxidation. Catalysis Today, 180(1), 81-87. https://doi.org/10.1016/j.cattod.2011.02.014