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CO oxidation performance of Au/Co3O4 catalyst on the micro gas sensor device

Paper ID Volume ID Publish Year Pages File Format Full-Text
55101 47040 2013 7 PDF Available
Title
CO oxidation performance of Au/Co3O4 catalyst on the micro gas sensor device
Abstract

The CO oxidation performance of the Au/Co3O4 catalyst on the micro gas sensor device with different treatment conditions has been investigated. The CO oxidation performance of the Au/Co3O4 catalyst on the micro device has been improved by the H2 combustion treatment under the flow of H2 in air and the reduction treatment under the flow of H2 in N2. The H2 combustion treatment of the Au/Co3O4 catalyst on the micro device prevented the degradation of the CO oxidation performance. To investigate the chemical states and microstructures of Au and Co in the Au/Co3O4 catalysts after the reduction and H2 combustion treatments, transmission X-ray absorption fine structure (XAFS) measurement and X-ray photoelectron spectroscopy (XPS) have been performed. Au particles of Au/Co3O4 were found to be metallic Au regardless of the treatment conditions. However, a hydroxyl group bonded to the transition metal Co as a form of Co(OH)2 was found on the catalyst surface after the H2 combustion treatment. The H2 combustion treatment of Au/Co3O4 results in the formation of OH− in the metal-support interface, which is considered to be an origin of the improvement of the CO oxidation performance of the Au/Co3O4 catalyst.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (85 K)Download as PowerPoint slideHighlights► H2 combustion treatment of Au/Co3O4 improves the catalyst performance. ► Hydroxyl group bonded to the transition metal Co as a form of Co(OH)2 is formed after the H2 combustion treatment. ► Presence of OH− in the metal-support interface is important to the CO oxidation performance of the Au/Co3O4 catalyst.

Keywords
CO oxidation; Au/Co3O4 catalyst; Micro gas sensor; XAFS; XPS
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CO oxidation performance of Au/Co3O4 catalyst on the micro gas sensor device
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 201, 1 March 2013, Pages 85–91
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
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