期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 666, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2023.131304
关键词
Carbon dioxide; Cycloaddition; Ionic liquid; Imidazole; MCM-41
Integrating multifunctional active sites into appropriate porous materials is a promising strategy for achieving excellent catalytic performance in CO2 cycloaddition. In this work, carboxy-functionalized imidazolium ionic liquids were successfully anchored onto MCM-41 mesoporous silicates. The resulting MCM-41-Imi/COOH catalyst integrates various active sites and possesses high surface area and mesopore structure. The catalyst exhibits good catalytic activity, cycling stability, and versatility for CO2 cycloaddition reactions.
Integrating multifunctional active sites into an appropriate porous material is a promising strategy to achieve great catalytic performance for CO2 cycloaddition. Herein, carboxy-functionalized imidazolium ionic liquid were successfully anchored onto the MCM-41 mesoporous silicates. The resultant MCM-41-Imi/COOH integrates hydrogen bond donor, Lewis base and nucleophilic ionic sites, and possesses a high surface area and mesopore structure. As-prepared catalyst achieves a good catalytic activity for CO2 cycloaddition with propylene oxide under cocatalyst- and solvent-free conditions. Moreover, the catalyst MCM-41-Imi/COOH exhibits the good cycling stability and versatility to various epoxides. In particular, the catalyst shows a satisfactory catalytic activity for catalyzing dilute CO2 conversion to cyclic carbonate. Furthermore, a possible reaction mechanism for the cycloaddition of CO2 with propylene oxide over the catalyst MCM-41-Imi/COOH was proposed.
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