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

doi: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

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

Research output: Contribution to journal › Article › peer-review

32 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 language	English
Pages (from-to)	81-87
Number of pages	7
Journal	Catalysis Today
Volume	180
Issue number	1
Early online date	9 Mar 2011
DOIs	https://doi.org/10.1016/j.cattod.2011.02.014
Publication status	Published - 17 Jan 2012

Bibliographical note

Acknowledgements
Thanks are due to Mr. F. Sánchez Constenla for performing a part of the EPR experiments. Financial support by the MICINN (Project CTQ2009 - 14527) and Comunidad de Madrid (Project DIVERCEL S2009/ENE-1475) is acknowledged.

Keywords

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

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Cite this

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

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.",

keywords = "Ceria-based catalysts, CO oxidation, Copper oxide, Cu and O EPR, Nitric oxide reduction, Operando-DRIFTS",

author = "A. Mart{\'i}nez-Arias and Hungr{\'i}a, {A. B.} and A. Iglesias-Juez and M. Fern{\'a}ndez-Garc{\'i}a and Anderson, {J. A.} and Conesa, {J. C.} and G. Munuera and J. Soria",

note = "Acknowledgements Thanks are due to Mr. F. S{\'a}nchez Constenla for performing a part of the EPR experiments. Financial support by the MICINN (Project CTQ2009 - 14527) and Comunidad de Madrid (Project DIVERCEL S2009/ENE-1475) is acknowledged.",

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doi = "10.1016/j.cattod.2011.02.014",

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T2 - Promoting effect of NO on CO oxidation

AU - Martínez-Arias, A.

AU - Hungría, A. B.

AU - Iglesias-Juez, A.

AU - Fernández-García, M.

AU - Anderson, J. A.

AU - Conesa, J. C.

AU - Munuera, G.

AU - Soria, J.

N1 - Acknowledgements Thanks are due to Mr. F. Sánchez Constenla for performing a part of the EPR experiments. Financial support by the MICINN (Project CTQ2009 - 14527) and Comunidad de Madrid (Project DIVERCEL S2009/ENE-1475) is acknowledged.

PY - 2012/1/17

Y1 - 2012/1/17

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.

AB - 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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