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      Atomically dispersed Au-(OH)x species bound on titania catalyze the low-temperature water-gas shift reaction.

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          Abstract

          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-O-TiO(x) 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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          Author and article information

          Journal
          J. Am. Chem. Soc.
          Journal of the American Chemical Society
          1520-5126
          0002-7863
          Mar 13 2013
          : 135
          : 10
          Affiliations
          [1 ] Department of Chemical and Biological Engineering, Tufts University, Medford, Massachusetts 02155, USA.
          Article
          10.1021/ja312646d
          23437858
          a27dc8a5-dde8-4a07-ae36-d8355687eb15
          History

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