The efficient separation of gases has industrial, economic, and environmental importance. Here, we report the improvement in gas separation performance of a polyimide-based matrix (Matrimid5218) filled with a Cu-based metal organic framework [MOF, Cu(BTC)] with two different ionic liquids (ILs) confined within the pores. The chosen ILs are commonly used in gas solubilization, 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF]) and 1-Ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][OTf]), and the incorporation of the [EMIM][BF]@Cu-BTC and [EMIM][OTf]@Cu-BTC composites in Matrimid5218 proved to be an efficient strategy to improve the permeability and selectivity toward CO/N and CO/CH mixtures.
Bernardo Monteiro, Ana R. Nabais, Maria H. Casimiro, Ana P. S. Martins, Rute O. Francisco, Luísa A. Neves and Cláudia C. L. Pereira
Mixed matrix membranes; metal–organic frameworks; ionic liquids; gas separation; Cu3(BTC)2; IL@Cu3(BTC)2; IL@MOF