Portal de Periódicos da CAPES

Atomically Dispersed Au–(OH) x Species Bound on Titania Catalyze the Low-Temperature Water-Gas Shift Reaction

2013; American Chemical Society; Volume: 135; Issue: 10 Linguagem: Inglês

10.1021/ja312646d

1943-2984

Ming Yang, Lawrence F. Allard, Maria Flytzani‐Stephanopoulos,

Copper-based nanomaterials and applications

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.