纳米H3PW12O40／SiO2复合杂多酸催化合成乙酸正己酯

以纳米二氧化硅为载体，采用溶胶-凝胶法负载磷钨酸，以冰乙酸、正己醇为原料，纳米H3PW12O40／SiO2复合杂多酸为催化剂，考察原料配比、催化剂用量、反应时间、反应温度等因素对酯化反应的影响，同时也考察了催化剂循环使用的情况。实验表明，纳米H3PW12O40／SiO2复合杂多酸催化剂是合成乙酸正己酯的良好催化剂，其最优合成条件为：纳米H3PW12O40／SiO2复合杂多酸催化剂用量约为反应酸醇配料总质量的2．5％，酸醇配比为1：1．4，反应时间1h，反应温度130℃，产率达89．72％。

Catalytic synthesis of hexyl by nano H3PW12O40/SiO2 heteropoly acid

The effect of ratio of raw materials, amount of catalyst, reaction time, reaction temperature on esterification and＇the situation of catalyst reuse were investigated with nano-silica as carrier, acetic acid and n-hexanol as raw materials, by sol-gel method supported phosphotungstic acid, nano H3PW12O40/SiO2 heteropoly acid as catalyst. Experiment showed that the nano H3PW12O40/SiO2 was the good catalyst for synthesis of hexyl acetate. The optimal conditions were as follows ： catalyst amount 2.5% of total amount of acid and alcohol, molar ratio of acid to alcohol 1： 1.4,reaction time 1 h,temperature 130 ℃. The yield was up to 89.72%.