CO_2 adsorption on amine-modified mesoporous silicas

摘要

Mesoporous silicas with enhanced pore structures were synthesized and polyethylenimine (PEI) was immobilized in them to produce adsorbents for CO_2. The prepared samples were characterized by N_2 adsorption-desorption isotherms and small angle X-ray diffraction, and their CO_2 adsorption performance were evaluated. CO_2 adsorption capacity increased with operating temperature initially and then decreased. Besides, CO_2 adsorption capacity increased due to the PEI loading with more amine sites. The results showed that the structure of support played an important role in the CO_2 adsorption capacity. High surface area and large pore volume also favored the CO_2 adsorption capacity.