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- W2391122012 abstract "MoO 3/SiO 2 catalyst was prepared by sol gel method at low temperature, in which ammonium heptamolybdate and tetraethoxysilane (TEOS) were used as molybdenum and silica precursor, respectively. The catalyst samples were characterized by N 2 adsorption, XRD and FT IR. The results show that the MoO 3/SiO 2 has higher surface area ( e.g. A =363 8 m 2/g for 10%MoO 3/SiO 2) and MoO 3 is highly dispersed on SiO 2. Different acidic hydrolysts (HCl, HNO 3 and HAc) used in the preparation of catalyst can affect obviously the surface area of MoO 3/SiO 2 catalyst and the dispersion of MoO 3 on SiO 2. MoO 3/SiO 2 catalyst, prepared using HCl as acidic hydrolyst, exhibits higher surface area and more uniform dispersion of MoO 3 on support than that prepared using other hydrolysts. The catalytic performance of MoO 3/SiO 2 for the epoxidation of propylene to propylene oxide by 30% cumene hydroperoxide was examined and the effects of reaction conditions (such as temperature, time, pressure, solvent and basic depressor) were studied in detail. The results show that the tert butanol is an available solvent and the epoxidation of propylene can be promoted by adding basic depressor into the solvent. When NaHCO 3 ( ρ =2 5 g/L ) was used as basic depressor, the selectivity for propylene oxide could increase. 15%MoO 3/SiO 2 catalyst, prepared using HCl as acidic hydrolyst, showed higher activity and selectivity for propylene oxide, for instance, using tert butanol as solvent and at 110 ℃ and 0 6 MPa for 2 h, the conversion of cumene hydroperoxide is 89% and the selectivity for propylene oxide is 80%." @default.
- W2391122012 created "2016-06-24" @default.
- W2391122012 creator A5040184503 @default.
- W2391122012 date "2002-01-01" @default.
- W2391122012 modified "2023-09-25" @default.
- W2391122012 title "Epoxidation of Propylene with Cumene Hydroperoxide over MoO_3/SiO_2 Catalyst Prepared by Sol-Gel Method" @default.
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