Enhanced cycloaddition of CO2 to epichlorohydrin over zeolitic imidazolate frameworks with mixed linkers under solventless and co-catalyst-free condition

• Published in: Catalysis today Vol. 339; pp. 337 - 343
• Main Authors: Xiang, Wenlong, Sun, Zeyu, Wu, Yurong, He, Liang-Nian, Liu, Chang-jun
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2020
• Subjects: CO2; Cyclic carbonates; Cycloaddition; Mixed ligands; Zeolitic imidazolate framework; Cyclic carbonates; Zeolitic imidazolate framework; Cycloaddition; Mixed ligands; CO2
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2019.01.050

ga1 •ZIF-8-90 showed significantly improved selectivity (up to 99%) compared to ZIF-8.•ZIF-8-90 exhibited better catalytic ability with lower cost than ZIF-90.•A higher TOF of ZIF-8-90 was obtained than those of most of other ZIFs.•ZIF-8-90 displayed enhanced framework stability with good cycling. An efficient dual-ligand zeolitic imidazolate framework ZIF-8-90 was fabricated for the synthesis of five-membered cyclic carbonate from CO2 and epichlorohydrin (ECH) in the absence of co-catalysts and solvents. The effects of various reaction parameters were studied. The dual-ligand ZIF-8-90 showed very high selectivity (up to 99%). ZIF-8-90 exhibited better catalytic ability with lower cost than ZIF-90 and enhanced framework stability with significantly improved selectivity compared to ZIF-8. Moreover, the catalyst has been successfully reused for three cycles with negligible decrease in the catalytic activity. A plausible mechanism for the ZIF-8-90 catalyzed ECH−CO2 cycloaddition under solvent-free and co-catalyst-free has been proposed.