Selective sulfoxidation reactions with H2O2 catalyzed by Ti-containing SBA-15 materials

• Published in: Journal of porous materials Vol. 26; no. 2; pp. 533 - 539
• Main Authors: Andrei, Radu Dorin, Cambruzzi, Nathan, Bonne, Magali, Lebeau, Bénédicte, Hulea, Vasile
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.04.2019; Springer Nature B.V; Springer Verlag
• Subjects: Acetonitrile; Catalysis; Catalysts; Characterization and Evaluation of Materials; Chemical reactions; Chemical Sciences; Chemistry; Chemistry and Materials Science; Dibenzothiophene; Ethanol; Hydrogen peroxide; Oxidation; Physical Chemistry; Silicon dioxide; Sulfones; Titanium dioxide; Topology; Sulfides; Oxidation; Hydrogen peroxide; Ti-SBA-15; Dibenzothiophene; sulfoxidation; heterogeneous catalysis; H2O2
• ISSN: 1380-2224; 1573-4854
• DOI: 10.1007/s10934-018-0640-1

This contribution relates the behavior of Ti-SBA-15 catalysts in the sulfoxidation reaction with hydrogen peroxide under mild conditions (40–70 °C). Ti-SBA-15 samples with 1, 3 and 5 wt% of TiO 2 have been prepared by grafting SBA-15 silica with Ti(O i Pr) 4 in ethanol followed by calcination. Due to their mesopores, the Ti-containing catalysts accommodated large molecules like methyl-phenyl-sulfide, diphenylsulfide and dibenzothiophene, which were selectively oxidized into their corresponding sulfoxides and sulfones. The turnover frequency was correlated with the amount of the tetrahedral Ti atoms in the catalyst. During the oxidation process performed in batch mode, with acetonitrile or ethanol as solvent, the catalyst topology and texture were preserved, but the nature of the Ti species suffered some changes.