Triphenyltin hydroxide as a precursor for the synthesis of nanosized tin‐doped TiO₂ photocatalysts

This is the authors' abstract. We don't add key points for this paper.

Abstract 1 H and 119 Sn NMR results indicate that, when Ph 3 SnOH is dissolved in CD 2 Cl 2 , it dehydrates to (Ph 3 Sn) 2 O, only a small amount of Ph 3 SnOH remaining in equilibrium at room temperature. As a result, the reaction of TiCl 4 with Ph 3 SnOH in CH 2 Cl 2 proceeds via hydrolysis of the halide to precipitate amorphous TiO 2 that contains adsorbed organotin species. Calcination of the amorphous precursor to 723 K yields nanoparticles of tin‐doped TiO 2 photocatalysts, that contain anatase and rutile phases, and may also contain a segregated SnO 2 phase. The reaction conditions that lead to the formation of a SnO 2 phase have been studied and we have found that it is formed when the amorphous precipitate is not thoroughly washed with CH 2 Cl 2 or when non‐recrystallized commercial Ph 3 SnOH is used as a starting material. The catalysts obtained have a high activity for the photooxidation of toluene in the gas phase. In particular, a material obtained from non‐recrystallized Ph 3 SnOH is particularly promising because the toluene photooxidation rate is more than twice as high as when using Degussa P25.