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Novel CO2 adsorbents were prepared by grafting of various aminosilanes on mesoporous silica SBA-15. CO2 adsorption capacities of aminosilane modified SBA-15 in the presence of water vapor were comparable to those in the absence of water vapor. It was found that efficiency of amine increased with increasing surface density of amine.

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Mesoporous silica materials with different pore volumes were functionalized by wet impregnation with a variety of amines for the purpose of CO 2 adsorption. The effects of the concentration and composition of amine blends, silica supports, and adsorption temperature on CO 2 adsorption were investigated. The mechanism of an observed synergistic effect between blended amines is also discussed. The experimental results showed that in addition to the pore volume of the supports and the adsorption temperature the molecular functional groups of the blended amines play an important role and greatly affect the CO 2 adsorption capacity. The silica material with the largest pores (MSU-F) had the highest CO 2 adsorption capacity after impregnation with a mixture of 40 wt % tetraethylenepentamine and 30 wt % diethanolamine. For 100 kPa CO 2 , the adsorption capacity at 50 °C was 5.91 mmol/g.

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