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Atomically well-defined Au25(SR)17/18 nanoclusters deposited on silica supports for the aerobic epoxidation of trans-stilbene

Paper ID Volume ID Publish Year Pages File Format Full-Text
54678 47020 2014 7 PDF Available
Title
Atomically well-defined Au25(SR)17/18 nanoclusters deposited on silica supports for the aerobic epoxidation of trans-stilbene
Abstract

•We synthesized gold-based catalysts from atomically well defined thiolate gold clusters.•We showed that a good interaction between external amino functions of the gold nanoparticles and the hydrophilic substrate lead to stable catalyst.•We showed that functionalized gold nanoparticles have higher catalytic activity than the unfunctionalized one.

Two atomically well-defined thiolate gold nanoclusters, Au25(SC2H4Ph)18 and Au25(SPhNH2)17, having the same gold core but different thiolate ligands have been deposited on silica supports and the obtained catalysts have been tested in the aerobic oxidation of trans-stilbene. By properly selecting the support to maximize cluster/surface interactions, it was possible to prepare materials with small nanoparticles and very narrow particle size distributions. Au25(SPhNH2)17@SBA-15 catalyst showed an activity and a trans-stilbene epoxide selectivity comparable to the best heterogeneous catalysts. Elimination of the thiolate molecules by calcination did not significantly modify the particle size but decreased the activity, pointing out the critical role of the ligands in the reaction.

Graphical abstractHigh activity of trans-stilbene epoxidation by using thiolate Au25 clusters as precursors on SBA-15.Figure optionsDownload full-size imageDownload high-quality image (350 K)Download as PowerPoint slide

Keywords
Gold clusters; Thiolate ligands; Aerobic oxidation; Alkene
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Atomically well-defined Au25(SR)17/18 nanoclusters deposited on silica supports for the aerobic epoxidation of trans-stilbene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 235, 15 October 2014, Pages 72–78
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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