Non-hydrolytic SiO2-TiO2 mesoporous xerogels – efficient catalysts for the mild oxidation of sulfur organic compounds with hydrogen peroxide

摘要: Abstract SiO2–TiO2 mixed oxides with molar ratios Ti/(Si + Ti) ranging from 0.03 to 0.09 were prepared by a non-hydrolytic sol–gel process using SiCl4 and TiCl4 precursors. The texture the distribution of Ti atoms in resulting xerogels strongly depended on concentration as precursor reaction temperature. Mesoporous very high surface area (up 1200 m2 g−1) pore diameters 7.9 nm) can be obtained at 150 °C loading 6 mol%. These mesoporous materials showed excellent catalytic performances sulfoxidation different bulky sulfides (methyl phenyl sulfide, diphenyl sulfide), thiophenes (benzothiophene, dibenzothiophene, tetrahydrothiophene, 4,6-dimethyl dibenzothiophene) H2O2. In all cases selectivity toward H2O2 consumption oxidizing agent was observed (>98%).