期刊
JOURNAL OF CO2 UTILIZATION
卷 33, 期 -, 页码 284-291出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2019.06.013
关键词
CO2 utilization; Epoxides; Cyclic carbonate; Ionic liquids; Bases
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2018R1D1A1B07048146]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry Energy (MOTIE) [20174010201160]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20174010201160] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2018R1D1A1B07048146] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Carbon dioxide (CO2) mitigation via utilization can be a potential solution to global warming issues such as increasing CO2 concentration. In this study, we present the synthesis and characterisation of 3-(2-hydroxyethyl)-1-vinyl-1H-imidazol-3-ium chloride [EvimOH][Cl] and 3-(2-hydroxyethyl)-1-vinyl-1H-imidazol-3-ium sulphate [EvimOH][HSO4] ionic liquids for cycloaddition reactions of CO2 and epoxides into cyclic carbonates. The synthesized ionic liquids were characterized by FT-IR, H-1- and C-13-NMR spectroscopic methods. Also, we have analysed the physical properties of ionic liquids by using TGA and DTA. Further, the CO2 consumption was done by developing a binary catalytic system with bases such as DBU, TEA, DIPEA, piperidine, pyrrolidine, aniline. The developed binary ([EvimOH][Cl]/base) catalytic system exhibited the excellent catalytic activity of 99.8% conversion and >= 99% selectivity under mild reaction conditions without the aid of solvent and metal co-catalysts. Furthermore, the results show that the improved activity from the binary system is due to synergistic effect among -OH functional group from the cation, reactive acidic C(2)-H in the imidazolium ring and amine containing bases which promote the CO2 absorption. Also, a plausible mechanism of cyclic carbonate formation and kinetic study in the presence of binary catalytic system was demonstrated.
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