Imidazolium-Based Poly(ionic liquid)s as New Alternatives for CO2 Capture.

Solid imidazolium-based poly(ionic liq.)s with variable mol. wts. that contain the poly[2-(1-butylimidazolium-3-yl)ethyl methacrylate] (BIEMA) cation and different counter-anions were evaluated in terms of CO2 capture and compared with classical ionic liqs. with similar counter-anions. In addn. to poly(ionic liq.)s with often-applied ions such as BF4-, PF6-, NTf2-, trifluoromethanesulfonate (OTf-) and Br-, for the 1st time [BIEMA][acetate] was synthesized, which revealed a remarkably high CO2 sorption performance that exceeded the poly(ionic liq.)s studied previously on av. by a factor of four (12.46 mg/gPIL). This study provides an understanding of the factors that affect CO2 sorption and a comparison of the CO2 capture efficiency with the frequently used sorbents. Also, all the studied sorbents were reusable if regenerated under carefully selected conditions and can be considered as suitable candidates for CO2 sorption. [on SciFinder(R)