Aerobic Oxidation of Cyclohexane Catalyzed by Size-Controlled Au Clusters on Hydroxyapatite: Size Effect in the Sub-2 nm Regime

作者：Liu Yongmei; Tsunoyama Hironori; Akita Tomoki; Xie Songhai; Tsukuda Tatsuya^*

来源：ACS Catalysis, 2011, 1(1): 2-6.

DOI：10.1021/cs100043j

• Au clusters
• size effect
• aerobic oxidation
• hydroxiapatite

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.

• 出版日期2011-1