Abstract:

Immobilized ionic liquid catalyst（IL-Ala/SiO₂）was prepared by sol-gel method with L-alanine as raw material and SiO₂ as a supporter. This catalyst was characterized by FTIR, TG, ¹³C NMR, ¹H NMR, XRD and TEM. Catalytic properties were studied in propylene carbonate (PC) hydrolysis. The results show that immobilized ionic liquid catalyst can efficiently catalyze propylene carbonate hydrolysis to produce 1,2-propylene glycol (PG). Reaction occurred under normal pressure, which could avoid a high pressure condition. The conversion rate of PC and the selectivity of PG were greater than 99% when catalyst weight content was 9%, reaction temperature was 140 ℃, and reaction time was 3.5 h. The catalyst could be used at least 5 times through simple separation and its activity only slightly changed.

摘要：

以L-丙氨酸为原料采用溶胶-凝胶法制备了以SiO₂为载体的固载化离子液体催化剂（IL-Ala/SiO₂）。用红外光谱（FTIR）、热重（TG）、¹³C NMR、¹H NMR、XRD和TEM等测试技术进行了表征，考察了催化剂在碳酸丙烯酯（PC）水解反应中的催化性能。结果表明，该催化剂在常压下能有效催化碳酸丙烯酯水解生成1,2-丙二醇（PG）。在催化剂含量为9%（质量分数）、温度140 ℃、反应时间3.5 h的条件下，PC的转化率大于99%，PG的选择性大于99%。经简单分离后催化剂可重复使用5次而活性变化不大。