NEW EFFICIENT CATALYSTS TI-SBA15 AND TI-ALSBA15 FOR GREEN CHEMISTRY APPLICATION TO SELECTIVE OXIDATION OF ALKENES

摘要

New structured mesoporous catalysts TiSBA15 and Ti-AlSBA15 were synthesised by grafting titanium on the pore internal surface of various SBA15 and Al-SBA15 materials by means of titanium tetrachloride in the gas phase. These catalysts were tested in the oxidation of alkenes by alkyl hydroperoxides in mild conditions (343-353 K). The silica based materials lead, in any case, to the selective formation of the epoxides with a high level of conversion over four catalytic runs. Al-based supports afford an efficient acid-catalysed ring opening of oxiranes and allow the direct conversion of cyclohexene to adipic acid with a yield of 80%.