Control of titania nanodomain size as a route to modulate SMSI effect in Pt/TiO2 catalysts
Résumé
Platinum based mesostructured SiO2 supported TiO2 nanoclusters (TiO2 content ranging from W to 50 wt %) were synthesized and characterized Titania nanodomains (<4 nm) dispersed in the silica porosity are obtained Derived 1 wt % Pt/xTiO(2)-SiO2 nanocomposites were tested in the cyclohexane dehydrogenation reaction a structure insensitive reaction to evaluate metal-support interaction Pt/xTiO(2)-SiO2 nanocomposites display largely higher SMSI effect than measured over classical Pt/TiO2 P25 catalyst While platinum particle size is found to be affected by the mania loading in the composite similar SMSI effect is measured for all solids displaying similar TiO2 crystal size Titania crystal size is evidenced as an important parameter allowing a control of the SMSI effect the lower the crystal size the stronger the metal-support interaction