Abstract
Mesoporous silicas with enhanced pore structures were synthesized and polyethylenimine (PEI) was immobilized in them to produce adsorbents for CO2. The prepared samples were characterized by N2 adsorption–desorption isotherms and small angle X-ray diffraction, and their CO2 adsorption performance were evaluated. CO2 adsorption capacity increased with operating temperature initially and then decreased. Besides, CO2 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 CO2 adsorption capacity. High surface area and large pore volume also favored the CO2 adsorption capacity.
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