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- W2070005607 abstract "Abstract The MoO 3 /SiO 2 catalysts containing different surface molybdenum species were prepared by a sol–gel method, and the effects of the preparation condition and MoO 3 loading on the surface molybdenum species and property of MoO 3 /SiO 2 were studied. The XRD, FT-IR, UV–vis and Raman spectroscopies were used to characterize the surface molybdenum species, and temperature-programmed desorption of NH 3 adsorbed on a catalyst was used to detect the surface acidic properties. The results show that, there were the dispersed polymolybdate, α-MoO 3 , β-MoO 3 , monomeric molybdenum species and silicomolybdic acid on the MoO 3 /SiO 2 catalyst, and their distributions and subsistence states were affected by the preparation condition and MoO 3 loading. Different molybdenum species exhibit different catalytic activities for the epoxidation of propylene with cumene hydroperoxide. In the 15 wt% MoO 3 /SiO 2 catalyst synthesized at pH 9.1 and dried appropriately, there are the small size β-MoO 3 and monomeric molybdenum species that they are mainly effective catalyst components for the epoxidation of propylene. Using this catalyst, the ∼100% conversion of cumene hydroperoxide and ∼100% selectivity to propylene oxide can be obtained in the tert -butyl alcohol solvent at 2.6 MPa and 80 °C for 4 h." @default.
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- W2070005607 date "2010-01-01" @default.
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- W2070005607 title "The molybdenum species of MoO3/SiO2 and their catalytic activities for the epoxidation of propylene with cumene hydroperoxide" @default.
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- W2070005607 doi "https://doi.org/10.1016/j.jiec.2010.01.023" @default.
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