Characterization of 1,8-diazabicyclo(5.4.0)undec-7-ene-hydroxyl-based ionic liquid for CO ₂ capture

Six 1,8-diazabicyclo(5.4.0)undec-7-ene-based ionic liquids (ILs) linked with ethyl or propyl hydroxyl cations, coupled with thiocyanate, dicyanamide and bistriflimide anions, were synthesized through a two-step reaction: quaternization and ion exchange. The characterization of the ILs was carried out using ¹H and ¹³C nuclear magnetic resonance spectroscopy (NMR) and Fourier-transform infrared spectroscopy (FTIR). The NMR results confirmed the structures of all the ILs, and these were supported by the FTIR results. In addition, the physicochemical properties, namely thermal stability, density and refractive index, were determined. The effects of the chain length in the cation and the identity of the anion on CO₂ absorption were studied in a pressure drop equipment at different pressures. It was found that CO₂ sorption increased with increasing pressure and the number of nitrile groups present. The highest CO₂ sorption is reported to be 0.96 mol CO₂ mol^-1 IL at 20 bar.