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Redox and catalytic properties of CuO/CeO2 under CO + O2 + NO: Promoting effect of NO on CO oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
55591 47058 2012 7 PDF Available
Title
Redox and catalytic properties of CuO/CeO2 under CO + O2 + NO: Promoting effect of NO on CO oxidation
Abstract

A CuO/CeO2 catalyst has been studied with respect to its catalytic activity for CO oxidation under stoichiometric conditions employing either O2 or O2–NO mixture as oxidants. The obtained results are rationalised on the basis of analysis of redox properties upon interaction with CO and O2–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 NOx 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.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (131 K)Download as PowerPoint slideResearch highlights► CuO/CeO2 catalyst was examined for CO oxidation with O2 or O2–NO mixture as oxidants. ► A novel promoting effect of NO on CO oxidation by O2 is revealed and characterized. ► The driving force for such promotion appears related to interface activation upon desorption of NOx species. ► The type of NO reduction active site/mechanism changes during the run under CO–O2–NO is evidenced.

Keywords
Copper oxide; Ceria-based catalysts; CO oxidation; Nitric oxide reduction; Cu2+ and O2− EPR; Operando-DRIFTS
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Redox and catalytic properties of CuO/CeO2 under CO + O2 + NO: Promoting effect of NO on CO oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 180, Issue 1, 17 January 2012, Pages 81–87
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us