Abstract
Sputtered samples of Pt TiO 2 and TiO Pt 2 and cosputtered samples of PtTiO 2 have been prepared and studied by TEM, electron diffraction, AES, Auger profiling, and XPS to determine the nature of the SMSI state induced in these samples after high-temperature (~500 °C) treatment in hydrogen. Based mainly on observations that the surface was enriched with, not depleted of, platinum, and that TiO x , species with Ti in the 2+ oxidation state and x close to 1 actually diffused into the platinum, it is proposed that the SMSI state of the Pt TiO 2 system is intimately associated with the formation of an intermediate surface compound of the type Pt n TiO x , where n is probably greater than 1 and x is close to 1. This process of surface compound formation is greatly facilitated in the presence of hydrogen.
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