CO_(2)环加成的多相催化剂制备及其应用

Preparation and Applications of Multiphase Catalysts for CO_(2)Cycloadditio

CO_(2)环加成反应制备环状碳酸酯是CO_(2)利用的一种有效途径。制备了一种以氯球为载体、固载咪唑基离子液体的新型多相固体催化剂,催化合成碳酸丙烯酯。在固定床上评价,催化剂表现出良好的催化性能。通过考察温度、反应压力、液时空速、原料比对反应的影响,总结出催化反应的最佳条件为130℃、2 MPa、0.6~0.8 h^(-1)、CO_(2)和环氧丙烷进料物质的量比为2.5∶1。在上述条件下,反应转化率大于95%,选择性大于98%。

The synthesis of cyclic carbonates by CO_(2)cycloaddition is an efficient CO_(2)utilization reaction.In this paper,a novel multiphase solid catalyst was prepared by solidifying imidazole-based ionic liquid on chlorine spheres as carrier,and it was used to catalyze the synthesis of propylene carbonate.Its catalytic performance was evaluated on a fixed bed reactor.The effects of temperature,pressure,air velocity,ratio of reactants on the reaction were examined.The results showed that the catalyst had very high catalytic activity.When the reaction temperature was 130℃,the pressure was 2 MPa,the air velocity was 0.6~0.8 h^(-1)and the molar ratio of CO_(2)to propylene oxide feed was 2.5∶1,the conversion of propylene oxide could be more than 95%and the selectivity of propylene carbonate was around 98%.