Facile Preparation of Poly(ionic liquid)s-zinc Halide Composite Toward Highly Efficient Conversion of CO2 into Cyclic Carbonates
Bing Li 1, 2  
,   Zheyu Li 1, 2  
,   Shuqu Zhang 1, 2  
,   Wanyuan Yang 1, 2  
,   Weili Dai 1, 2  
,   Lixia Yang 1, 2  
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Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, Jiangxi Province, People’s Republic of China
National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang 330063, Jiangxi Province, People’s Republic of China
Weili Dai   

Nanchang Hangkong University, China
Submission date: 2020-09-01
Acceptance date: 2020-10-20
Online publication date: 2021-02-10
A class of novel poly(ionic liquid)s-ZnX2 complexes ([IMEP]R-ZnX2 (R = Cl, Br, X = Cl, Br, I) with multi-functional active sites were fabricated by a facile method and initially employed as efficient heterogeneous catalysts for transformation of CO2 and epoxides into corresponding cyclic carbonates without the aid of any organic solvent and co-catalyst. Therein, the one-pot fabrication of poly(ionic liquid)s was realized using imidazole and epibromohydrin or epichlorohydrin as raw materials. The catalysts revealed pronounced activity and selectivity toward the cycloaddition reaction under the optimal conditions (120ºC, 2.0 MPa and 3 h). The effect parameters of the reaction, such as reaction temperature, duration time, initial CO2 pressure, amount of catalyst, the counter anions and halide ions of the catalysts were also investigated. The cooperative effect of Lewis acidic Zn sites and hydroxyl group for polarizing the oxygen atom of epoxide, together with the nucleophilic attack of X- on the adjacent β-carbon atom of epoxide promotes readily the ring-opening, thus leading to the enhanced activity. In addition, the catalytic activity can be retained substantially after five times of recycling test.