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

Research output: Contribution to journalArticle

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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

Fingerprint

Carbon Monoxide
Oxidation
Oxidants
Paramagnetic resonance
Catalyst activity
Desorption
Copper
Adsorption
Catalysts
Oxidation-Reduction

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

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

Redox and catalytic properties of CuO/CeO 2 under CO + O 2 + NO : Promoting effect of NO on CO oxidation. / Martínez-Arias, A.; Hungría, A. B.; Iglesias-Juez, A.; Fernández-García, M.; Anderson, J. A.; Conesa, J. C.; Munuera, G.; Soria, J.

In: Catalysis Today, Vol. 180, No. 1, 17.01.2012, p. 81-87.

Research output: Contribution to journalArticle

Martínez-Arias, A, Hungría, AB, Iglesias-Juez, A, Fernández-García, M, Anderson, JA, Conesa, JC, 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, vol. 180, no. 1, pp. 81-87. https://doi.org/10.1016/j.cattod.2011.02.014
Martínez-Arias A, Hungría AB, Iglesias-Juez A, Fernández-García M, Anderson JA, Conesa JC et al. Redox and catalytic properties of CuO/CeO 2 under CO + O 2 + NO: Promoting effect of NO on CO oxidation. Catalysis Today. 2012 Jan 17;180(1):81-87. https://doi.org/10.1016/j.cattod.2011.02.014
Martínez-Arias, A. ; Hungría, A. B. ; Iglesias-Juez, A. ; Fernández-García, M. ; Anderson, J. A. ; Conesa, J. C. ; Munuera, G. ; Soria, J. / Redox and catalytic properties of CuO/CeO 2 under CO + O 2 + NO : Promoting effect of NO on CO oxidation. In: Catalysis Today. 2012 ; Vol. 180, No. 1. pp. 81-87.
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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.",
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N2 - 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.

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