Supported ionic liquid sorbents for CO2 capture from simulated flue-gas

Abstract Supported ionic liquid (IL) sorbents for CO 2 capture were prepared by impregnating tetramethylammonium glycinate ([N 1111 ][Gly]) into four types of porous materials in this study. The CO 2 adsorption behavior was investigated in a thermogravimetric analyzer (TGA). Among them, poly(methyl methacrylate) (PMMA)-[N 1111 ][Gly] exhibits the best CO 2 adsorption properties in terms of adsorption capacity and rate. The CO 2 adsorption capacity reaches up to 2.14 mmol·g − 1 sorbent at 35 °C. The fast CO 2 adsorption rate of PMMA-[N 1111 ][Gly] allows 60 min of adsorption equilibrium time at 35 °C and much shorter time of 4 min is achieved at 75 °C. Further, Avrami's fractional-order kinetic model was used and fitted well with the experiment data, which shows good consistency between experimental results and theoretical model. In addition, PMMA-[N 1111 ][Gly] remained excellent durability in the continuous adsorption–desorption cycling test. Therefore, this stable PMMA-[N 1111 ][Gly] sorbent has great potential to be used for fast CO 2 adsorption from flue-gas.