摘要
以溴化1-丁基-3-甲基咪唑离子液体和磷钨杂多酸（H3PW12O40）为原料制备了杂多酸功能化离子液体复合材料催化剂（bmiin—PW12），并用于催化乙酸与正丁醇酯化合成乙酸正丁酯的反应，考察Ybmim-PW12不同热处理温度对其结构以及催化酯化反应活性的影响．结果表明，bmim—PW12在500℃热处理时杂多酸阴离子仍保持Keggin结构，但有机阳离子在350℃以上发生了部分分解．bmim—PW12在400℃热处理具有纳米多孔结构和较大的酸强度，且在丁醇与乙酸酯化合成乙酸丁酯反应中，具有较高的催化活性和较好的重复使用性能．
Fhnctionalized ionic liquid samples （bmim-PW12） were synthesized by 1-butyl-3-methyl- imidazolium bromide （bmimBr） and 12-phosphotungstic heteropolyacid （PW12）. The samples were annealed at 100-450 ℃ and were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, thermal gravity-DTG, brunauer emmett teller, and NHa-temperature programmed desorption. The results showed that the bmim-PW12 samples were crystal and maintained intact Keggin structure. The organic parts of those samples were partly decomposed at a temperature more than 350 ℃. The sample annealed at 400 ℃ exhibited nano-porous structure, strong acidity, and excellent catalytic activity on the esterification of n-butanol with acetic acid. The higher ester yield was obtained when the mass ratio of catalyst over the reactants amount was 5% for bmim-PW12 catalyst annealed at 400 ℃.
