Atomically Dispersed Au鈥?OH)x Species Bound on Titania Catalyze the Low-Temperature Water-Gas Shift Reaction
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- 作者：Ming Yang ; Lawrence F. Allard ; Maria Flytzani-Stephanopoulos
- 刊名：The Journal of the American Chemical Society
- 出版年：2013
- 出版时间：March 13, 2013
- 年：2013
- 卷：135
- 期：10
- 页码：3768-3771
- 全文大小：328K
- 年卷期：v.135,no.10(March 13, 2013)
- ISSN：1520-5126
文摘
We report a new method for stabilizing appreciable loadings (1 wt %) of isolated gold atoms on titania and show that these catalyze the low-temperature water-gas shift reaction. The method combines a typical gold deposition/precipitation method with UV irradiation of the titania support suspended in ethanol. Dissociation of H2O on the thus-created Au鈥揙鈥揟iOx sites is facile. At higher gold loadings, nanoparticles are formed, but they were shown to add no further activity to the atomically bound gold on titania. Removal of this 鈥渆xcess鈥?gold by sodium cyanide leaching leaves the activity intact and the atomically dispersed gold still bound on titania. The new materials may catalyze a number of other reactions that require oxidized active metal sites.