CO2/light gas separation performance of cross-linked poly(vinylimidazolium) gel membranes as a function of ionic liquid loading and cross-linker content

► Cross-linked poly(RTIL)-RTIL gels for CO2/N2, CO2/CH4 and CO2/H2 separations. ► Gel membranes fabricated from di- and mono-functional RTIL monomers. ► RTIL loading (wt.%) and cross-linking monomer concentration (mol%) varied. ► CO2 permeability dramatically increased with RTIL loading. ► Reduced cross-linking monomer concentration generally improved CO2 permeability.