A novel solid adsorbent for CO 2 capture was developed by loading pentaethylenehexamine (PEHA) on SBA-15 by a wet impregnation method. The structural properties of the adsorbents were characterized by the XRD, N 2 adsorption/desorption, TGA, SEM, and TEM techniques. The effects of PEHA loading, adsorption temperature, and height/diameter ratio of the fixed bed on the CO 2 adsorption performance were investigated in a fixed-bed adsorption system. The structural characterization showed that both the surface area and total pore volume of PEHA-loaded SBA-15 decreased with increasing PEHA loading. The CO 2 working adsorption capacity reached 201.7 mg of CO 2 /(g of adsorbent) for SBA-15–PEHA-70 and 308.3 mg of CO 2 /(g of PEHA) for SBA-15–PEHA-50. A two-amine-layer adsorption model was built to interpret the CO 2 adsorption performance. The CO 2 working adsorption capacity decreased with increasing height/diameter ratio; however, the CO 2 breakthrough adsorption capacity increased. Regeneration experiments showed that the CO 2 working adsorption capacity of SBA-15–PEHA remained stable in consecutive adsorption/desorption cycles.
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Li et al. (2013) studied this question.
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