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Au–Pd/AC as catalysts for alcohol oxidation: Effect of reaction parameters on catalytic activity and selectivity

Paper ID Volume ID Publish Year Pages File Format Full-Text
42883 45944 2009 8 PDF Available
Title
Au–Pd/AC as catalysts for alcohol oxidation: Effect of reaction parameters on catalytic activity and selectivity
Abstract

The oxidation of different alcohols with molecular oxygen in water has been investigated using a range of activated carbon-supported Au–Pd bimetallic catalysts. The effect of the Au–Pd ratio on the conversion and selectivity was observed and a synergistic effect is present in a large range of the Au–Pd ratio, being maximized for Au80–Pd20 composition instead of Au90–Pd10 shown in glycerol oxidation [A. Villa, C. Campione, L. Prati, Catal. Lett. 115 (2007) 133]. Moreover the enhancement of conversion observed by adding a base resulted greater for gold-rich catalysts rather than for palladium-rich ones.The effect of the alcohol concentration and the metal/substrate ratio in the presence or the absence of the base was also studied revealing substantial differences in terms of both activity and selectivity. At 1 M concentration under biphasic conditions benzyl alcohol has been selectively oxidized to benzaldehyde (S90 = 98%) even in the presence of NaOH with a TOF of 18,000 h−1 using Au60–Pd40/AC as the catalyst.

Graphical abstractThe oxidation of different alcohols with molecular oxygen in water has been investigated using a range of activated carbon-supported Au–Pd bimetallic catalysts. The effect of the Au–Pd ratio was observed on the conversion and selectivity and a synergistic effect is present in a large range of Au–Pd ratio. Moreover the enhancement of conversion observed by adding a base resulted higher for gold-rich than for palladium-rich catalyst. Under controlled conditions, even in the presence of the base, a high selectivity to aldehyde was obtained using Au60–Pd40/AC as the catalyst.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Gold–palladium alloy; Alcohol oxidation
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Au–Pd/AC as catalysts for alcohol oxidation: Effect of reaction parameters on catalytic activity and selectivity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 364, Issues 1–2, 31 July 2009, Pages 221–228
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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