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

Supported ionic liquid (IL) sorbents for CO2 capture were prepared by impregnating tetramethylammonium glycinate ([N-1111][Gly]) into four types of porous materials in this study.The CO2 adsorption behavior was investigated in a thermogravirnetric analyzer (TGA). Among them. poly(methyl methacrylate) (PMMA)-[N-1111][Gly] exhibits the best CO2 adsorption properties in terms of adsorption capacity and rate. The CO2 adsorption capacity reaches up to 2.14 mmol.g(-1) sorbent at 35 degrees C. The fast CO2 adsorption rate of PMMA-[N-1111][Gly] allows 60 min of adsorption equilibrium time at 35 degrees C and much shorter time of 4 min is achieved at 75 degrees 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 CO2 adsorption from flue-gas. (C) 2018 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.