Pt nanoparticles supported on highly dispersed TiO2 coated on SBA-15 as an efficient and recyclable catalyst for liquid-phase hydrogenation

A series of TiO2@SBA-15 composites with different TiO2 loadings have been synthesized through hydrolysis of tetrabutyl orthotitanate via a facile sol–gel method in the presence of SBA-15 mesoporous silica. The TiO2@SBA-15 composites retain the mesostructure of the SBA-15 host, and TiO2 is highly dispersed and uniformly coated. The TiO2@SBA-15 composites serve as remarkable supports for Pt nanoparticles, which can be applied efficiently to the liquid-phase hydrogenation of benzaldehyde, its derivatives, and other unsaturated compounds under mild conditions. Of particular note is that the Pt/TiO2@SBA-15 catalysts can be reused several times without distinct loss in activity or selectivity. The more electron-deficient surface state, together with the structural and physicochemical features of Pt/TiO2@SBA-15 catalysts, would improve the catalytic activity and reusability toward the liquid-phase hydrogenation of unsaturated compounds.

Graphical abstractThe TiO2@SBA-15 composites serve as remarkable supports for Pt nanoparticles, which were proved active, selective and recyclable for the liquid-phase hydrogenation of benzaldehyde under mild conditions. The more electron-deficient surface state, together with the structural and physicochemical features of Pt/TiO2@SBA-15 catalysts, would improve the catalytic activity and reusability toward the liquid-phase hydrogenation of unsaturated compounds.Figure optionsDownload full-size imageDownload high-quality image (134 K)Download as PowerPoint slideHighlights► TiO2@SBA-15 composites with different TiO2 loadings as support for Pt nanoparticles. ► Pt/TiO2@SBA-15 catalyst is effective for liquid-phase hydrogenation of benzaldehyde. ► Catalysts are more efficient than the Pt/TiO2 catalyst under mild conditions. ► Catalysts can be reused for several times in water for benzaldehyde hydrogenation. ► Catalysts are also active for the hydrogenation of other unsaturated compounds.