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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

Paper ID Volume ID Publish Year Pages File Format Full-Text
45833 46423 2013 15 PDF Available
Title
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
Abstract

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 (1 0 0) faces of the ceria support.

Graphical abstractStructure/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 (1 0 0) faces in ceria nanocubes as most interesting for the process.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► 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.

Keywords
Nanostructured CuO-CeO2 catalysts; CO-PROX; HREM; EPR; TPR; Operando-DRIFTS; XPS; Raman; XRD
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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
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 130–131, 7 February 2013, Pages 224–238
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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