Composite Sorbents for CO2 Capture Based on Polyethyleneimine and Silica Gel: Study of Sorption Properties and Analysis of Thermal Energy Consumption

Studies of CO 2 sorption by composite sorbents containing the active component (branched polyethylenimine) dispersed in the pores of mesoporous support (silica gel) have been carried out. It is shown that as silica gel pores are filled with polyethylenimine, the sorption efficiency of CO 2 by the active component decreases, and the dynamic sorption capacity per 1 g of material passes through a maximum. The enthalpy values of CO 2 sorption by composite sorbents have been determined. It is shown that the enthalpy values of CO 2 sorption depend on the proportion of pore filling by the active component and on the characteristics of the porous structure of the support. Thermal energy consumption for regeneration of composite sorbents within the adsorption cycle was analyzed.