Nanotech 2010

The Nanophysics of TiO2/Au Model Catalyst as a Key to Understanding the High Efficiency of Real Au/TiO2 Catalyst and Technological Consequences

I.V. Tvauri, D.F. Remar, A.M. Turiev, N.I. Tsidaeva, K. Fukutani, T.T. Magkoev
University of North Ossetia, RU

Keywords: surface nanostructure, thin films, molecular reaction on surface

Abstract:

Interaction of carbon monoxide and oxygen on the surface of titania/Au(111) inverse model catalyst held at 200 K has been studied by a set of surface science techniques. It was found that CO adsorbs on the oxide/Au perimeter interface, whereas no or very weak adsorption was observed on Au(111) or titania surface, respectively. Exposing of such species to oxygen results in their decay possibly due to carbon dioxide formation. Efficiency of this effect is higher at lower CO initial concentration which points at the importance of free surface sites for the reaction process. The latter offers a number of possibilities to notably improve the technology of CO catalytic oxidation.
 
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