Experimental and theoretical study on dicationic imidazolium derived poly(ionic liquid)s for catalytic cycloaddition of CO2-epoxide

Pyrazolium ionic liquids with multiple active sites immobilized on mesoporous MCM-41 for chemical fixation of CO2 under mild conditions

“…28,42 Consequently, this effect contributes to the enhanced efficiency of electron transfer and the conversion of carbon dioxide to propylene oxide. The results of our study are consistent with the ndings of Du et al, 43 where it was observed that the catalysts derived from DILs with hexyl chains exhibited enhanced catalytic activity compared to those from DILs with butyl chain groups. Besides, the presence of halide anions in catalytic activity (dibromide in our case) has been proved to be benecial in the xation of CO 2 .…”

Ordered Macro–Microporous Covalent Organic Frameworks as Bifunctional Catalysts for CO2 Cycloaddition

“…Based on some previous reports, ,− and the current DFT results, a tentative mechanism for macro-EB-COF:Br-H 2 PO 4 catalyzing CO 2 cycloaddition with epoxide can be proposed (Scheme S1). First, the H 2 PO 4 – ions, as Brønsted acid sites, can bond with the O atom of epoxide and activate the epoxy ring.…”

Controlling dual-positively charged pyrazolium ionic liquids for efficient catalytic conversion of CO2 into carbonates under mild conditions

“…Imidazolium-based ionic liquids often demonstrate higher catalytic performance due to their unique properties, including lower viscosity, higher thermal stability, and tunability of physical and chemical properties through structural modification, owing to their five-membered ring. 30,31 Numerous imidazolium-based ILs, including protic, hydroxyl, carboxylic, amino, and dicationic ILs, have been documented to display superior catalytic activity. 32,33 Pyrazolium ionic liquids (PzILs) with a similar ring structure may exhibit comparable catalytic efficacy in CO 2 conversion to cyclic carbonates.…”