CO Oxidation Promoted by Gold Atoms Supported on Titanium Oxide Cluster Anions
详细信息 查看全文
- 作者：Xiao-Na Li ; Zhen Yuan ; Sheng-Gui He
- 刊名：Journal of the American Chemical Society
- 出版年：2014
- 出版时间：March 5, 2014
- 年：2014
- 卷：136
- 期：9
- 页码：3617-3623
- 全文大小：351K
- 年卷期：v.136,no.9(March 5, 2014)
- ISSN：1520-5126
文摘
Laser ablation generated Aux(TiO2)yOz鈥?/sup> (x = 0, 1; y = 2, 3; z = 1, 2) oxide cluster anions have been mass-selected using a quadrupole mass filter and reacted with CO in a hexapole collision cell. The reactions have been characterized by time-of-flight mass spectrometry and density functional theory calculations. Gold鈥搕itanium bimetallic oxide clusters Au(TiO2)yOz鈥?/sup> are more reactive in CO oxidation than pure titanium oxide clusters (TiO2)yOz鈥?/sup>. The computational studies identify the dual roles that the gold atom plays in CO oxidation: functioning as a CO trapper and electron acceptor. Both factors are important for the high reactivity of Au(TiO2)yOz鈥?/sup> clusters. To the best of our knowledge, this is the first example of CO oxidation by gold-containing heteronuclear oxide clusters, which provides molecular-level insights into the roles of gold in CO oxidation over oxide supports.