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A novel environmental friendly catalyst,H 3 PW 12 O 40 /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 H 3 PW 12 O 40 /MCM-48 was studied with methacrylic acid and n-butyl alcohol as reactants. H 3 PW 12 O 40 /MCM-48 is an excellent catalyst for synthesizing n-butyl methacrylate and Keggin structure of H 3 PW 12 O 40 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%.
A novel environmental friendly catalyst, H 3 PW 12 O 40 / 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 H 3 PW 12 O H 3 PW 12 O 40 / MCM-48 is an excellent catalyst for synthesizing n-butyl methacrylate and Keggin structure of H 3 PW 12 O 40 kept unchanged after being impregnated on the 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 yield the product were investigated. 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%.