Preferential oxidation of CO in excess H2 over CuO/CeO2 catalysts: Characterization and performance as a function of the exposed face present in the CeO2 support

Structure/activity relationships on the basis of multitechnique characterization and catalytic testing complemented by operando-DRIFTS analysis for the preferential oxidation of CO in H2-rich streams demonstrate interactions of dispersed CuO with CeO2 (100) faces in ceria nanocubes as most interesti...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2013-02, Vol.130-131, p.224-238
Main Authors: Gamarra, D., Cámara, A. López, Monte, M., Rasmussen, S.B., Chinchilla, L.E., Hungría, A.B., Munuera, G., Gyorffy, N., Schay, Z., Corberán, V. Cortés, Conesa, J.C., Martínez-Arias, A.
Format: Article
Language:English
Subjects:
Carbon monoxide
Catalysis
CATALYSTS
CERIUM ALLOYS (0 TO 50 CE)
Cerium oxide
CO-PROX
Cobalt
COPPER OXIDE
EPR
HREM
MATHEMATICAL ANALYSIS
Mathematical models
MICROSTRUCTURES
Nanostructure
Nanostructured CuO-CeO2 catalysts
Operando-DRIFTS
Oxidation
Raman
TPR
XPS
XRD
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Summary:Structure/activity relationships on the basis of multitechnique characterization and catalytic testing complemented by operando-DRIFTS analysis for the preferential oxidation of CO in H2-rich streams demonstrate interactions of dispersed CuO with CeO2 (100) faces in ceria nanocubes as most interesting for the process. [Display omitted] ► CO-PROX catalytic properties of CuO/CeO2 as a function of the exposed face in CeO2. ► Ceria nanocubes supported system shows most interesting CO-PROX performance. ► Redox and particle size properties of dispersed CuO particles appear most relevant. A series of oxidised copper-cerium nanostructured catalysts prepared by impregnation of copper over ceria supports synthesized by different methods (hydrothermal with varying preparation parameters, microemulsion/precipitation), in order to achieve different specific morphologies (nanocubes, nanorods and nanospheres), have been examined with respect to their catalytic properties for preferential oxidation of CO in excess H2 (CO-PROX). The catalysts have been characterized in detail by XRD, Raman, SBET measurement, HREM, XPS, TPR and EPR, which allows establishing a model of structural characteristics of the catalysts. The characterization results have been correlated with analysis of CO-PROX catalytic properties by means of catalytic activity measurements complemented by operando-DRIFTS. Structural dependence of the CO oxidation reaction on the dispersed copper oxide entities as a function of the exposed face present at the surface of the different ceria supports is revealed. An important overall enhancement of the CO-PROX performance is detected for the sample supported on ceria nanocubes which is proposed to be a consequence of the interaction between copper oxide and (100) faces of the ceria support.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2012.11.008