Journal
CHEMICAL ENGINEERING JOURNAL
Volume 390, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124652
Keywords
Carbon dioxide; Ionic liquid; Hypercrosslinked polymers; Cyclic carbonates; Heterogeneous catalysis
Categories
Funding
- National Natural Science Foundation of China [U1662107, 21476109, 21136005, 21303084]
- Six talent peaks project in Jiangsu Province [JNHB-035]
- Project of Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Efficient chemical fixation of carbon dioxide (CO2) into valuable fine chemicals requires porous materials with highly active catalytic centers. Herein, multifunctional imidazolium based hypercrosslinked ionic polymers with versatile functional groups (sulfonic, hydroxyl, amino, carboxyl, and alkyl group), abundant microporosity and high ionic site density were constructed in a two-step solvothermal route including free-radical copolymerization of divinylbenzene (DVB), 4-vinylbenzyl chloride (VBC) and imidazolium bromide ionic liquids (ILs) and successive Friedel-Crafts alkylation based hypercrosslinkage. The resultant hydroxyl-functional ionic polymer demonstrated promising performances in selective adsorption and conversion of CO2 via cycloaddition with epoxide. High yield associating with large turnover number (TON) and turnover frequency (TOF), stable reusability and well substrate compatibility were achieved, affording an efficient metal-free heterogeneous catalyst for CO2 fixation. The full microporous structure resulted in CO2 enrichment around the robust hydroxylfunctional ionic sites, showing a synergistic effect to promote CO2 transformation.
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