纳米H3PW12O40/SiO2复合杂多酸催化合成乙酸正戊酯

采用溶胶—凝胶法制备了纳米H3PW12O40/SiO2复合杂多酸,并以其催化合成乙酸正戊酯,研究了催化剂用量、反应时间、反应温度、酸醇摩尔比等对酯化反应的影响,考察了纳米H3 PW12O40/SiO2复合杂多酸催化剂的重复使用性能,并将其催化性能和磷钨酸进行了比较.结果表明,在冰乙酸用量为0.05 mol、酸醇摩尔比为...

Synthesis of n-Amyl Acetate Catalyzed by Nano-Silica Supported Phosphotungstic Acid

The nano-silica supported phosphotungstic acid H3PW12O40/SiO2 was prepared by sol-gel method and was applied to the synthesis of n-amyl acetate.The effects of catalyst dosage,reaction time,reaction temperature,molar ratio of acetic acid to n-amyl alcohol on the esterification reaction were explored.Under the optimum synthetic conditions as follows:the acetic acid amount was 0.05 mol,the molar ratio of acetic acid to n-amyl alcohol was 1∶1.8,the catalyst dosage was 4.6% of total mass of the reactants,the reaction time was 1.5 h,the reaction temperature was about 130 ℃,the cyclohexanol amount was 10 mL,the yield of n-amyl acetate reached 91.1%.The reusability performance of H3PW12O40/SiO2 was perfect,and its catalytic performance was better than that of H3PW12O40.