Journal
ACS CATALYSIS
Volume 1, Issue 1, Pages 2-6Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cs100043j
Keywords
Au clusters; size effect; aerobic oxidation; hydroxiapatite
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Funding
- JST, Japan
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In this work, we synthesized gold clusters, Au-n (n = 10, 18, 25, 39), with atomically controlled sizes on hydroxyapatite (HAP) and studied the catalysis for aerobic oxidation of cyclohexane. These Au-n/HAP catalysts could efficiently oxidize cyclohexane to cyclohexanol and cyclohexanone. The turnover frequency monotonically increased with an increase in the size, reaching values as high as 18 500 h(-1) Au atom(-1) at n = 39, and thereafter decreased with a further increase in n up to n similar to 85. This finding provides a fundamental insight into size-specific catalysis of gold in the cluster,regime (diameter < 2 nm) and a guiding principle for rational design of Au cluster-based catalysts.
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