| Methyl methacrylate (MMA) is a monomer that is used to polymerize the organic glass and the MBS resin. MMA is mainly produced by the method of acetone-cyanohydrins (ACH) in our country. Because of the complex synthetic route and the long technological process, the yield of MMA reduced after many steps of reactions and production cost increased. In addition, seriously poisonous substance such as hydrocyanic acid is used as raw material in this method, and the treatment of numerous waste acids is difficult which results in the obvious environment pollution. Considering all of these conditions, it is necessary to develop a new chemical technological process to synthesis MMA.Recently, in many countries isobutene as a raw material to produce MMA has been adopted and this method is already industrializd. This is a technological process of green chemical industry. Utilization ratio of raw material can be raised. This method will result great benefit to both the economy and the society if the method can be used more widely. The selective oxidation of isobutene to methacrolein is one of the key steps in the synthesis of MMA from the oxidation of isobutene. Therefore, it is of great importance to research the synthetic method and performance of the selective oxidation of isobutene to methacrolein for improving the conversion of isobutene and the selectivity of the methacrolein.In this thesis, we substituted the vanadium (V5+) with high valence molybdenum (Mo6+) in the scheelite-type BiVO4 and explored the catalytical performance of the complex oxide Bi1-x/3V1-xMoxO4 (01-x/3V1-xMoxO4 (0 |
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