Zn-based ionic liquids as highly efficient catalysts for chemical fixation of carbon dioxide to epoxides
作者:Mengshuai Liu、Fangxiao Wang、Lei Shi、Lin Liang、Jianmin Sun
DOI:10.1039/c4ra14111c
日期:——
The novel Zn-based task-specific ionic liquids (Zn-TSILs) catalysts were developed for the coupling of carbon dioxide and epoxides to form cyclic carbonates under mild reaction conditions without using additional organic solvents and cocatalysts. Due to the synergistic effects of the cation and anion in this catalytic system, excellent yields and selectivities to cyclic carbonates were achieved with
开发了新型的基于锌的特定任务离子液体(Zn-TSILs)催化剂,用于在温和的反应条件下不使用其他有机溶剂和助催化剂的情况下将二氧化碳与环氧化物偶联形成环状碳酸酯。由于阳离子和阴离子在该催化体系中的协同作用,在高达794 h -1的高TOF值下,可实现优异的收率和对环状碳酸酯的选择性。在所研究的催化剂中,含OH的Zn-TSIL表现出比含COOH的Zn-TSIL更好的活性,并且发现[(CH 2 CH 2 OH)Bim] ZnBr 3是最好的。此外,还研究了CO [ 2]压力和催化剂浓度对[[CH 2CH 2 OH)Bim] ZnBr 3。另外,比较确定了Zn-TSIL和TSIL催化的环加成反应的速率常数和活化能。对于裸露的TSIL催化剂,活化能被计算为34.1kJ mol -1,而Zn-TSIL将活化能值降低了14.7kJ mol -1。此外,Zn-TSIL易于回收利用,而活性没有明显损失,代表了将CO