Luffa sponge supported dendritic imidazolium ILs with high-density active sites as highly efficient and environmentally friendly catalysts for CO2 chemical fixation. Issue 38 (May 2020)

• Record Type: Journal Article
• Authors: Lai, Shilin; Gao, Jinbing; Zhang, Hui; Cheng, Lin; Xiong, Xingquan
• Is Part Of: Journal of CO₂ utilization. Issue 38(2020)
• Page Start: 148
• Page End: 157
• Publication Date: 2020-05
• Subjects: Luffa sponge fibers -- CO2 -- Dendritic imidazolium ILs -- Cyclic carbonates -- Green synthesis; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2020.01.004
• Languages: English
• ISSNs: 2212-9820

Abstract

Graphical abstract: Highlights: Luffa sponge-supported dendritic imidazolium ionic liquid heterogeneous catalysts with high ionic density were prepared. A series of cyclic carbonates have been efficiently synthesized in high yields (84–99 %) under mild reaction conditions. There was a positive dendritic effect on the yields of cyclic carbonates. Cyclic carbonates could be prepared on a multigram scale. Abstract: Efficient using of green heterogeneous catalysts from renewable natural sources through chemical modification for the cycloaddition of terminal epoxides with CO2 is attractive but still challenging. Luffa sponge is a cheap, biodegradable, abundant and renewable source with netting-like three-dimensional porous structure. Herein, we report a simple and facile approach to the preparation of a series of novel luffa sponge-supported dendritic imidazolium ILs heterogeneous catalysts LS-DIL-(G1-G3) with high ionic density from natural luffa sponge fibers. LS-DIL-(G1-G3) were properly characterized by FT-IR spectroscopy, TGA, elemental analysis, and SEM. Among them, LS-DIL-G3 was found to exhibit the highest catalytic activity for the synthesis of cyclic carbonates under metal-free and solvent-free conditions. It was clearly observed that there was a positive dendritic effect on the yields of cyclic carbonates. Furthermore, a wide range of terminal epoxides was converted smoothly to the corresponding cyclic carbonates with high yields (84–99 %). LS-DIL-G3 could be reused for up to six consecutive runs without any obvious decline in catalytic activity. Importantly, the desired cyclic carbonates could be prepared on a multigram scale by using LS-DIL-G3 as a green heterogeneous catalyst.