中文摘要：

用SiO2为载体,通过溶胶凝胶法制备了H6P2W18O62/SiO2催化剂,以乙酸和正丁醇为原料合成了乙酸正丁酯。考察了磷钨酸负载量、催化剂用量、醇酸比、反应时间和反应温度对反应的影响,并提出可能的催化机理。结果表明,最优的反应条件为：负载量为25%,催化剂用量1.12%（按反应体系总质量计算）,醇酸比2.0：1.2,反应时间2h,反应温度120℃,在此条件下酯化率可达95.30%。催化重复使用5次,酯化率仍可达63.24%

英文摘要：

Phosphotungstics acid with Dawson structure（P2W18） supported on SiO2 were prepared by the sol-gel method.The catalytic performance in synthesis of n-Butyl acetate with acetic acid and n-butanol was investigated and the mechanism was discussed.The optimized condition were as follows：the supported quantity is 25%,the mass ratio of the catalyst to total reactant was 1.12%,the molar ratio of n-butyl alcohol to acetic acid was 2.0：1.2,the reaction time was 2 hours,the reaction temperature was 120 ℃.Yield of n-Butyl acetat could reach 95.30% under the optimum conditions.The catalyst could be reused for 5 times and the isolated of adipic acid was still above 63.24%.