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

doi:10.1016/j.jcat.2006.02.026

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

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

113 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 language	English (US)
Pages (from-to)	1-7
Number of pages	7
Journal	Journal of Catalysis
Volume	240
Issue number	1
DOIs	https://doi.org/10.1016/j.jcat.2006.02.026
State	Published - May 15 2006
Externally published	Yes

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

Access to Document

10.1016/j.jcat.2006.02.026

Cite this

@article{5d5be61f44f64667baa3227c241a50d5,

title = "Comparative study on redox properties of nanosized CeO2 and CuO/CeO2 under CO/O2",

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.",

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",

author = "A. Mart{\'i}nez-Arias and D. Gamarra and M. Fern{\'a}ndez-Garc{\'i}a and Wang, {X. Q.} and Hanson, {J. C.} and Rodriguez, {J. A.}",

note = "Funding Information: Thanks are due to S.J. Khatib and M.A. Ba{\~n}ares for their help in recording Raman spectra. D.G. thanks the FPI program of the “Ministerio de Educaci{\'o}n y Ciencia” for a doctoral research grant. Financial support from CICYT project MAT2003-03925 is acknowledged. The research carried out at Brookhaven National Laboratory was financed through contract DE-AC02-98CH10086 with the U.S. Department of Energy, Division of Chemical Sciences. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2006",

month = may,

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doi = "10.1016/j.jcat.2006.02.026",

language = "English (US)",

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T1 - Comparative study on redox properties of nanosized CeO2 and CuO/CeO2 under CO/O2

AU - Martínez-Arias, A.

AU - Gamarra, D.

AU - Fernández-García, M.

AU - Wang, X. Q.

AU - Hanson, J. C.

AU - Rodriguez, J. A.

N1 - Funding Information: Thanks are due to S.J. Khatib and M.A. Bañares for their help in recording Raman spectra. D.G. thanks the FPI program of the “Ministerio de Educación y Ciencia” for a doctoral research grant. Financial support from CICYT project MAT2003-03925 is acknowledged. The research carried out at Brookhaven National Laboratory was financed through contract DE-AC02-98CH10086 with the U.S. Department of Energy, Division of Chemical Sciences. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2006/5/15

Y1 - 2006/5/15

N2 - 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.

AB - 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.

KW - CO Oxidation

KW - CO-PROX

KW - Catalyst

KW - Ceria

KW - Copper oxide

KW - Electron paramagnetic resonance

KW - In situ Raman

KW - In situ X-ray diffraction

KW - Redox properties

KW - Water-gas shift

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