Fundamental background of improving the design and performance of Au/TiO2 supported catalyst

I.V. Tvauri, N.I. Tsidaeva, A.M. Turiev, S.A. Khubezhov, K. Fukutani, K. Christmann, T.T. Magkoev
North Ossetian State University, RU

Keywords: heterogeneous catalysis, carbon monoxide, X-ray photoelectron spectroscopy, titanium oxide, gold clusters

Summary:

Infrared reflection absorption and X-ray photoelectron spectroscopies are used to show that the process of carbon monoxide (CO) oxidation can occur on the surface of a system formed during the appearance of gold clusters on the surface of a titanium oxide layer cooled below room temperature. The efficiency of this process is significantly affected by stoichiometry of the titanium oxide layer. The use of a TiOx substrate with the stoichiometry different from TiO2 results in more effective CO oxidation in comparison with the process observed in the Au/TiO2 system. An important role in the oxidation process is played by the gold-oxide interface.