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Zn-based ionic liquids as highly efficient catalysts for chemical fixation of carbon dioxide to epoxides

机译：锌基离子液体是将二氧化碳化学固定为环氧化物的高效催化剂

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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 high TOF values up to 794 h(-1). Among the catalysts investigated, OH-containing Zn-TSILs showed better activity than COOH-containing Zn-TSILs, and [(CH2CH2OH)Bim]ZnBr3 was found to be the best. Additionally, the influences of CO2 pressure and catalyst concentration were also investigated over [(CH2CH2OH)Bim]ZnBr3. In addition, the rate constants as well as the activation energies for the cycloaddition reaction catalyzed by Zn-TSIL and TSIL were comparatively determined. The activation energy was calculated to be 34.1 kJ mol(-1) for bare TSIL catalyst, whereas the Zn-TSIL reduced the activation energy value by 14.7 kJ mol(-1). Moreover, the Zn-TSIL was easily recyclable without significant loss of activity, representing the exceptionally promising candidate for the effective fixation of CO2 to epoxides.
机译：开发了新颖的基于锌的任务专用离子液体（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，可获得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[[（CH2CH2OH）Bim] ZnBr3被认为是最好的。此外，还研究了CO2压力和催化剂浓度对[（CH2CH2OH）Bim] ZnBr3的影响。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34.1 kJ mol（-1），而Zn-TSIL将活化能值降低了14.7 kJ 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CO2有效固定到环氧化物上的极有希望的候选者。

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