Performance of CO2 adsorption by hybrid amine-functionalized MCM-41

ABSTRACT In this study, the performance of modified MCM-41 adsorbents by impregnation and grafting modification with 3-aminopropyltriethoxysilane (APTS) and polyethyleneimine (PEI) on the CO 2 adsorption was investigated. The results showed that the synergistic effect of APTS and PEI could improve the adsorption performance and thermal stability of the MCM-41 adsorbents. The CO 2 adsorption capacity of mixed amine-modified MCM-41 adsorbents was higher than single amine modified MCM-41 adsorbents. The maximum adsorption capacity (2.6512 mmol g –1 ) was obtained at MCM-41-APTS-5%-PEI-50%. Meanwhile, the adsorbents modified by mixed amine showed good cycle regeneration stability after five times of CO 2 adsorption/desorption cycling.