SBA-15 supported triazolium-based ionic liquids as highly efficient and recyclable catalysts for fixation of CO2 with epoxides

A series of molecular sieve SBA-15 supported 1,2,4-triazolium-based ionic liquids (TRILs) were synthesized and employed as efficient catalysts for the synthesis of cyclic carbonates from CO2 and epoxides. The effects of various parameters, such as functional groups, anions of the catalysts, reaction temperature, pressure, reaction time, and the amount of catalyst used, on the reaction were investigated systematically. In addition, the catalyst can be easily recovered by filtration and reused over six times without loss of catalytic activity. It was found that high yield (80–99%) and excellent selectivity (97–99%) of cyclic carbonates could be achieved at mild conditions (2.0 MPa, 110 °C and 2 h) without additional organic solvents or co-catalysts.

A series of molecular sieve SBA-15 supported 1,2,4-triazolium-based ionic liquids (TRILs) were synthesized and employed as efficient and recyclable catalysts for the synthesis of cyclic carbonates from CO2 and epoxides.Figure optionsDownload high-quality image (128 K)Download as PowerPoint slideHighlights
► Molecular sieve SBA-15 supported 1,2,4-triazolium-based ionic liquids (TRILs) were synthesized.
► Immobilized 1,2,4-triazolium-based ionic liquids were demonstrated as effective and recyclable catalysts for the synthesis of cyclic carbonates.
► Hydroxyl and carboxyl-functionalized 1,2,4-triazolium-based ILs immobilized on SBA-15 showed excellent activity and selectivity.
► The OH or COOH group in the TRIL cation combining a synergistic effect with the halide anions accelerated the reactions.