Core–Shell Dispersed Polymeric Ionic Liquids as Efficient Heterogeneous Catalyst for CO2 Conversion into Cyclic Carbonates
Core–Shell Dispersed Polymeric Ionic Liquids as Efficient Heterogeneous Catalyst for CO2 Conversion into Cyclic Carbonates
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核壳分散聚合离子液体作为高效多相催化剂将二氧化碳转化为环状碳酸酯
DOI：
10.1007/s10562-022-04103-2
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发表时间：
2022
影响因子：
2.8
通讯作者：
Cheng Weiguo
中科院分区：
文献类型：
--
作者：
Liu Shuaifei;Su Qian;Fu Mengqian;Deng Lili;Wang Yichao;Dong Li;Liu Yifan;Ma Xinqi;Cheng Weiguo
为了减少体积离子液体的用量，实现二氧化碳转化为碳酸盐反应的多相催化，成功地构建了核壳结构的聚离子液体。核壳型聚离子液体结构是以廉价易得的二氧化硅为载体，通过一步表面聚合而成。通过优化离子液体单体与SiO_2的比例，成功地获得了高活性、低离子液体用量的PIL@SiO_2(1：1.5)，并且只用了40%的体相离子液体就能获得高活性的准均相(PO转化率为95.5%)。结合表征和机理研究发现，在合适的比例(1：1.5)下，聚离子液体良好的介孔结构和一定程度的分散性可以使活性中心更好地分散，有利于多个分子同时活化，这是活性高的原因。此外，核壳结构还具有良好的基材适宜性和可回收稳定性。本研究为低成本多相离子液体催化剂的开发提供了良好的思路。
Core–shell polyionic liquids were successfully constructed to reduce the amount of bulk ionic liquids and realize heterogeneous catalysis in the reaction of CO2conversion into carbonate. The core–shell polyionic liquid structure is formed by one-step surface polymerization with cheap and readily available SiO2as the carrier. By optimizing the ratio of ionic liquid monomer to SiO2, PIL@SiO2(1:1.5) of high activity and low ionic liquid dosage was successfully obtained, and only 40% of bulk ionic liquid dosage was used to achieve high activity of quasi-homogeneous phase (PO conversion 95.5%). Combined with the characterization and mechanism study, it was found that at an appropriate ratio (1:1.5), good mesoporous structure and a certain extent dispersion of polyionic liquid can make the active site better dispersed to facilitate the simultaneous activation of multiple molecules, which is the reason for the high activity. In addition, the core–shell structure also has good substrate suitability and recyclability stability. This study provides good ideas for the development of low-cost heterogeneous ionic liquid catalysts.Graphical Abstract