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制备了一种由氯化锌和三己基十四烷基季膦盐离子液体组成的Lewis酸/碱复合催化体系,将其用于CO2与环氧烷烃的环加成反应,表现出高催化活性。系统地考察了反应温度、反应压力、反应时间及催化剂组成的影响,结果表明,以[(C6H13)3P(C14H29)]Br/ZnCl2(物质的量之比为2∶1)为催化剂,在CO2压力为2 MPa,反应温度为100℃,反应15 min条件下,碳酸丙烯酯收率达到95%。研究表明该催化体系也适用于CO2与其他环氧化物的环加成反应。最后提出了该催化体系的反应机理。
A Lewis acid / base composite catalyst system composed of zinc chloride and trihexyltetradecyl quaternary phosphonium ionic liquid was prepared, which was used for the cycloaddition of CO2 with alkylene oxides and showed high catalytic activity . The effects of reaction temperature, reaction pressure, reaction time and catalyst composition were investigated systematically. The results showed that the reaction temperature was controlled at [C6H13] 3P (C14H29)] Br / ZnCl2 The pressure was 2 MPa, the reaction temperature was 100 ℃, and the reaction rate was 15 min. The yield of propylene carbonate reached 95%. Studies have shown that the catalytic system is also suitable for the cycloaddition of CO2 with other epoxides. Finally, the reaction mechanism of the catalytic system is proposed.