Abstract
Ti−Al binary oxides prepared by a coprecipitation method exhibit different chemical behaviors from those of physically mixed TiO2−Al2O3 oxides, and the dispersion of the TiO2 species in the Ti−Al binary oxides increases when the composition of Al of the starting materials is increased. When benzophenone is adsorbed on the Ti−Al binary oxides, the photochemical and photophysical properties of benzophenone are found to be greatly different from those of benzophenone adsorbed on porous silica glass such as Vycor glass. Namely, the phosphorescence properties of benzophenone adsorbed on Ti−Al binary oxides show the presence of the protonated form of benzophenone in addition to the benzophenone hydrogen-bonded to the surface OH groups. The characteristics of the surface properties, structures, and activities of these binary oxides are examined by monitoring the characteristics of the isomerization of cis-2-butene as a probe reaction. The phosphorescence properties of the protonated and hydrogen-bonded form of b...
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