The Immobilization Of Molybdenum Complex And The Study Of Catalytic Property

We separately prepare the heterogeneous molybdenum-containing catalysts through sol-gel or ion exchange methods, and study their catalytic property by epoxide reaction. Firstly, active solid oxidation catalysts can be obtained by incorporating dioxomolybdenum (VI) species derived from MoO₂Cl₂(OPMePh₂)₂ into silica matrices via a sol-gel method. The supported catalyst has been characterized by elemental analysis, XRD, N₂-physisorption, FT-IR, FT-Raman, UV-visible and solid-state MAS NMR spectroscopy, and a pathway for the reaction between MoO₂Cl₂(OPMePh₂)₂ and tetraethoxysilane (TEOS) is suggested. The molybdenum catalyst was tested in the epoxidation of cyclohexene in the presence of terf-butyl hydroperoxide (TBHP). The conversion of cyclohexene and the selectivity to the epoxide were very high and increased further on raising the reaction temperature. After...