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Bi-functionalized ionic liquid porous copolymers for CO2 adsorption and conversion under ambient pressure
Reactive & Functional Polymers ( IF 4.5 ) Pub Date : 2020-05-23 , DOI: 10.1016/j.reactfunctpolym.2020.104636
Liwei Sun , Jingyi Luo , Ming Gao , Shaokun Tang

Developing solid materials with high CO2 adsorption capacity and catalytic activity has been a hotspot due to the greenhouse effect. In this work, bi-functionalized ionic liquid 1-vinyl-3-methoxyethyl imidazolium glycinate ([VMOEim][Gly]) was copolymerized with crosslinker divinylbenzene (DVB) to obtain bi-functionalized ionic liquid porous copolymers P(nDVB-[VMOEim][Gly]) and HP(nDVB-[VMOEim][Gly]). These copolymers possess loose stack of small particles or laminates, and they contain mesopores and a small number of micropores. For HP(0.6DVB-[VMOEim][Gly]), surface area reaches up to 508 m2·g−1 and the initial decomposition temperature is about 180 °C. Then these porous copolymers were applied for CO2 adsorption at 25 °C and cycloaddition reaction of CO2 with epichlorohydrin under ambient pressure and cocatalyst-free condition. The maximum CO2 capture capacity is 64.5 mg/g with HP(0.6DVB-[VMOEim][Gly]) as adsorbent. The effects of catalyst type, catalyst dosage, reaction time and temperature on the yield of cyclic carbonate were also investigated. The optimum conditions are 4 wt% of HP(0.6DVB-[VMOEim][Gly]) (based on the epichlorohydrin) as catalyst at 130 °C for 10 h, and the yield of 4-(chloromethyl)-1,3-dioxolan-2-one can reach 94%. Furthermore, the catalytic activity of HP(0.6DVB-[VMOEim][Gly]) maintains and the yield is 91% after five-cycle experiment. The mechanism of cycloaddition reaction was also discussed.



中文翻译:

在环境压力下用于CO 2吸附和转化的双功能离子液体多孔共聚物

由于温室效应,开发具有高CO 2吸附能力和催化活性的固体材料已成为热点。在这项工作中,将双官能化离子液体1-乙烯基-3-甲氧基乙基咪唑鎓甘氨酸盐([VMOEim] [Gly])与交联剂二乙烯基苯(DVB)共聚,以获得双官能化离子液体多孔共聚物P(n DVB- [VMOEim ] [Gly])和HP(n DVB- [VMOEim] [Gly])。这些共聚物具有小颗粒或叠层的松散堆叠,并且它们包含中孔和少量的微孔。对于HP(0.6DVB- [VMOEim] [Gly]),表面积达到508 m 2 ·g -1,初始分解温度约为180°C。然后将这些多孔共聚物用于CO2在25°C下吸附,在常压和无助催化剂条件下,CO 2与环氧氯丙烷的环加成反应。以HP(0.6DVB- [VMOEim] [Gly])为吸附剂,最大CO 2捕集能力为64.5 mg / g。还研究了催化剂类型,催化剂用量,反应时间和温度对环状碳酸酯收率的影响。最佳条件是在130°C下10 h制备4 wt%的HP(0.6DVB- [VMOEim] [Gly])(基于环氧氯丙烷)催化剂,并获得4-(氯甲基)-1,3- dioxolan-2-one可以达到94%。此外,经过五次循环实验,HP(0.6DVB- [VMOEim] [Gly])的催化活性得以维持,产率为91%。还讨论了环加成反应的机理。

更新日期:2020-05-23
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