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Influence of support surface basicity and gold particle size on catalytic activity of Au/γ-AlOOH and Au/γ-Al2O3 catalyst in aerobic oxidation of α,ω-diols to lactones

Paper ID Volume ID Publish Year Pages File Format Full-Text
46859 46451 2011 8 PDF Available
Title
Influence of support surface basicity and gold particle size on catalytic activity of Au/γ-AlOOH and Au/γ-Al2O3 catalyst in aerobic oxidation of α,ω-diols to lactones
Abstract

Gold catalysts on inert support γ-AlOOH and γ-Al2O3 were used as catalysts for selective aerobic oxidation of α,ω-diols to the corresponding lactones. The support crystal phase and basicity can be adjusted by calcination. Support calcined at below 573 K is in the γ-AlOOH phase and when calcined at above 773 K it is in the form of γ-Al2O3. There are only weak or medium basic sites on γ-Al2O3, while γ-AlOOH has strong or medium basic sites. Both support surface acidic–basic properties and gold particle size have influence on the activity and selectivity of the catalysts. Highly active catalysts can be obtained on both of the support, and from the characterization results it was found that the strong basic sites of γ-AlOOH were beneficial for the reaction, while selectivity would be sacrificed due to the hydrolysis of the product or further oxidation to acids under basic conditions. By loading gold onto γ-Al2O3, average gold particle size small as 3.8 nm can be obtained and it gives higher activity and selectivity than Au/γ-AlOOH.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► γ-AlOOH and γ-Al2O3 are used as support for the gold-supported catalysts in the green oxidation of diols to lactones. ► The catalytic activity of Au/AlT catalysts is very high, and 1,4-butanediol can be totally consumed in very short time. ► The activities of the as-prepared catalysts are higher than that of Au/TiO2, Au/FeOx and Au/commercial-γ-Al2O3. ► With strong basic sites on the surface, Au/γ-AlOOH shows high activity even though its gold particle size is much larger than Au/γ-Al2O3. ► The small gold particle size and the basicity of the support are all contributable to the excellent activity.

Keywords
Gold catalyst; Basicity; Particle size; Aluminum oxide; Green oxidation
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Influence of support surface basicity and gold particle size on catalytic activity of Au/γ-AlOOH and Au/γ-Al2O3 catalyst in aerobic oxidation of α,ω-diols to lactones
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 103, Issues 3–4, 5 April 2011, Pages 343–350
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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