期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 135, 期 10, 页码 3768-3771出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja312646d
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资金
- U.S. Department of Energy (DOE) [DE-FG02-05ER15730]
- Division of Scientific User Facilities, Office of Basic Energy Sciences, DOE
- AFOSR (MURI) [FA9550-08-1-0309]
We report a new method for stabilizing appreciable loadings (similar to 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-O-TiOx 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 excess 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.
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