Ionothermal Synthesis of Imidazolium and Triazine Integrated Porous Organic Frameworks for Efficient CO2 Adsorption and Synergetic Conversion into Cyclic Carbonates

• Published in: Industrial & engineering chemistry research 2021-10, Vol.60 (42), p.15027-15036
• Main Authors: Liu, Fangwang, Duan, Xinran, Liu, Mengshuai, Du, Jiameng, Ma, Jingjing, Liu, Fusheng
• Format: Article
• Language: English
• Subjects: Applied Chemistry
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/acs.iecr.1c02541

Novel imidazolium and triazine integrated porous organic frameworks (ImTPOFs) with nucleophilic groups were facilely constructed via dynamic ring trimerization under ionothermal conditions. They were used as robust materials for activation and synergetic transformation of CO2 to cyclic carbonate by coupling with epoxide. The structure–property relationships of the ImTPOFs obtained under different ionothermal conditions were investigated, and various influencing factors to the catalytic performance were examined. When using tetrabutylammonium bromide (TBAB) as a cocatalyst, ImTPOF-400-15 could effectively promote the CO2/epoxide cycloaddition reaction to yield desired cyclic carbonates under mild conditions. In addition, the reusability and applicability of optimum ImTPOF-400-15 were studied. ImTPOF-400-15 was easily separated and regenerated and could maintain high catalytic activity after five cycles. Detailed comparisons of the process conditions and performance were made with the reported heterogeneous catalysts, and a possible cycloaddition mechanism in the present catalytic system was finally proposed.