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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。
In order to find a more effective and simple ionic liquid for the preparation of 1,2-propanediol (PG), an imidazole ionic liquid with a basic site was synthesized by introducing a basic group onto the imidazolium cation. It is immobilized on the mesoporous molecular sieve SBA-15 to obtain a functionalized triethylamine immobilized ionic liquid material. The catalysts were characterized by infrared, thermogravimetry, X-ray diffraction, transmission electron microscopy and N2 adsorption-desorption. Characterization analysis shows that the specific surface area, pore volume and pore size of the immobilized catalyst decrease to some extent compared with the pure SBA-15. The catalytic activity in the hydrolysis of propylene carbonate was investigated. Under the condition of enough water, the best catalyst was obtained when the reaction temperature was 140 ℃, the amount of catalyst was 3% (mass fraction) and the reaction time was 2 h Efficacy, selectivity and yield are all greater than 99%, while the catalyst has reusability.