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Selective oxidation of hydrocarbons on supported Au catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
54541 47013 2014 6 PDF Available
Title
Selective oxidation of hydrocarbons on supported Au catalysts
Abstract

•Mononuclear TiOx in proximity of Au oxidizes propane to acetone.•Propene formation on Au/TiO2 suppressed in favor of acetone by overlayer of Ti-SiO2.•Methyl hydroperoxide is a likely intermediate in CO-assisted epoxidation of propene.

The importance of proximity of isolated TiOx cluster to Au surface for the formation of acetone in the selective oxidation of propane was investigated using a model system of Au particles decorated with mononuclear TiOx units dispersed in silica clusters. The results showed that no acetone was formed without TiOx, and its formation was more prominent on a sample containing a higher density of TiOx. Covering a Au/TiO2 catalyst with a layer of TiOx-containing silica changed the product selectivity from predominently propene to acetone. The data strongly supported the importance of isolated TiOx clusters near the Au surface in acetone formation, and suggested the relevance of Au-TiOx interface sites. Such interface sites might also be important in selective propene epoxidation that was coupled to CO oxidation in a H2O-methanol mixture. Using oxygen isotope labeling technique, it was found that the proximal source of oxygen in propene oxide was not from H2O but from O2. The observation was consistent with a methyl hydroperoxide intermediate, which could be formed by oxidation of a Ti methoxy at the Au-support interface.

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Keywords
Gold; Catalyst; Oxidation; Propane; Epoxidation; Interfacial site
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Selective oxidation of hydrocarbons on supported Au catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 238, December 2014, Pages 74–79
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
Any Questions? feel free to contact us