Abstract：In this work, resin-based solid amine adsorbents were obtained by effectively functionalizing polyethyleneimine (PEI) into porous resin (HP20) using a simple wet impregnation method. The effects of PEI loading (30%~60%), adsorption temperature (30~90℃) and pressure (2~100kPa) on the CO2 adsorption performance of the adsorbents were investigated. It was shown that the optimum PEI loading for the adsorbents was 50%, and that excess PEI resulted in a significant decrease in CO2 adsorption capacity and amine utilization efficiency. The screened adsorbents exhibited excellent CO2 adsorption performance at both low and high CO2 partial pressures, with CO2 adsorption capacities ranging from 3.06 to 3.78mmol/g at 30℃, indicating that resin-based solid amine adsorbents were suitable for different CO2 capture applications at various CO2 partial pressures. In addition, the CO2/CH4 and CO2/N2 selectivity of resin-based solid amine adsorbents ranged from 262 to 5858 and from 708 to 11551 at 2~100kPa, respectively, which were at a high level among various traditional and emerging solid adsorbents.
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