SBA-15固载离子液体在碳酸丙烯酯水解反应中的应用

 为寻找一种用于制备1，2-丙二醇（PG）的更有效简单的离子液体，通过在咪唑阳离子上引进碱性基团，合成了具有一个碱性位点的咪唑类离子液体，并将其固载到介孔分子筛SBA-15 上，制得功能化三乙胺固载离子液体材料。采用红外、热重、X射线衍射、透射电镜、N₂吸附-脱附等测试技术对催化剂进行了表征。通过表征分析可知，与纯硅SBA-15 相比，固载催化剂的比表面积、孔容和孔径有一定程度的减小。考察了其在碳酸丙烯酯水解反应中的催化活性，在有足够水的条件下，反应温度140℃、催化剂的用量为3%（质量分数）、反应时间为2 h 时，取得最好的催化效果，选择性和产率均大于99%，同时该催化剂具有重复使用性。

Application of SBA-15 Immobilized Ionic Liquid in Hydrolysis of Propylene Carbonate

With introduction of basic groups in the imidazole cation, the imidazole functional ionic liquid with an alkaline site was synthesised, which was immobilized on mesoporous molecular sieve SBA-15, and functionalized triethylamine immobilized ionic liquid material was obtained. The catalyst was characterized by FT-IR, TG-DTG, X-ray diffraction, transmission electron microscopy, N₂ adsorption-desorption methods. Analysis by characterization showed that the immobilized catalyst surface area, pore volume and pore diameter decreased compared with those of pure silica SBA-15. The catalytic activity of the catalyst was investigated in the hydrolysis reaction of propylene carbonate, under conditions of enough water, reaction temperature of 140℃, the amount of catalyst 3%, and reaction time 2 h, where the best catalytic effect was obtained. The selectivity and yield were more than 99%, and the catalyst was reusable.