Synthesis,characterization and catalytic application of H3PW12O40/MCM-48 in the esterification of methacrylic acid with n-butyl alcohol |
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| Authors: | Yijun Zhang Shuijin Yang |
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| Affiliation: | (1) Hubei Key Laboratory of Bioanalytical Technique, Department of Chemistry and Environmental Engineering, Hubei Normal University, Huangshi, 435002, China;(2) College of Chemistry, Central China Normal University, Wuhan, 430079, China |
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| Abstract: | A novel environmental friendly catalyst, H3PW12O40/MCM-48, was prepared by impregnation method. The catalysts were characterized by means of XRD and FT-IR. The synthesis of n-butyl methacrylate catalyzed by H3PW12O40/MCM-48 was studied with methacrylic acid and n-butyl alcohol as reactants. H3PW12O40/MCM-48 is an excellent catalyst for synthesizing n-butyl methacrylate and Keggin structure of H3PW12O40 kept unchanged after being impregnated on surface of the molecular sieve support. Effects of n(methacrylic acid):n(n-butyl alcohol), catalyst dosage, cyclohexane(water-stripped reagent) and reaction time on yields of the product were investigated. The optimum conditions have been found, that is, molar ratio of acid to alcohol is 1:1.6, mass ratio of catalyst used to the reactants is 0.5% and reaction time is 2.0 h. Under these conditions, the yield of n-butyl methacrylate can reach 93.7%. Funded by the Natural Science Foundation of Hubei Province, China (No. 2005ABA053) and the National Natural Science Foundation of China (No. 20471044) |
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| Keywords: | MCM-48 molecular sieve phosphotungstic acid n-butyl methacrylate catalysis |
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