Abstract
The mixed oxides SiO 2 /TiO 2 and SiO 2 /TiO 2 /Sb 2 O 5 were prepared with different Ti and Sb amounts and investigated by X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS) at the Ti K edge. There is no evidence for structural modification of titanium environment in the samples having between 5.6 and 20.3 wt% of TiO 2 . All the experimental evidence indicates that titanium has a local environment close to that of TiO 2 anatase. XAS show that this similarity is extends up to the next neighbouring Ti shells. XPS analysis shows that Ti and Sb are present as TiO 2 and Sb 2 O 5 .
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