Carbon dioxide (CO 2 ) absorption in several imidazolium-based ionic liquids (ILs), pyridinium-based ionic liquids and a tetraalkylammonium-based poly(ionic liquid) (PIL), poly [(p-vinylbenzyl) trimethylammonium hexafluorophosphate] P[[VBTMA] [PF 6 ], was studied. The trend of CO 2 solubility in all of the ILs increases dramatically with decreasing absorption temperature. Based on the same bis(triflamide) [Tf 2 N] anion, imidazolium, pyridinium and trihexyltetradecylphosphonium-based ionic liquids all show relatively similar CO 2 solubilities, which were higher than for the [ES] anion. The highest CO 2 absorption was found in a poly(ionic liquid) P[[VBTMA] [PF 6 ]], however, the monomer also showed higher CO 2 capacity than the other ionic liquids. The poly(ionic liquid) is remarkable in that it can adsorb 77% of its body weight of CO 2 with a selectivity over nitrogen of 70 : 1. The absorbed CO 2 gas can be readily desorbed from ionic liquids and poly(ionic liquid) and the selectivity for CO 2 over N 2 was consistent over repeated cycles. The materials can be reused several times for consecutive sorption/desorption cycles, without loss of performance in a large-scale reactor and therefore represent serious candidates for use in commercial adsorbers.

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Cyclic carbonate synthesis from an epoxide is achieved by sparging CO2 at 1 bar into the solution using an aluminium/TBAB catalyst.

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