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Adsorption of CO2 from Simulated Flue Gas on Pentaethylenehexamine-Loaded Mesoporous Silica Support Adsorbent

Wei, Li, Gao, Zhengming, Jing, Yu, Wang, Yundong
Industrial & Engineering Chemistry Research 2013 v.52 no.42 pp. 14965-14974
X-ray diffraction, adsorbents, adsorption, carbon dioxide, desorption, engineering, flue gas, models, nitrogen, porous media, scanning electron microscopy, silica, temperature, transmission electron microscopy
A novel solid adsorbent for CO₂ 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, N₂ adsorption/desorption, TGA, SEM, and TEM techniques. The effects of PEHA loading, adsorption temperature, and height/diameter ratio of the fixed bed on the CO₂ 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 CO₂ working adsorption capacity reached 201.7 mg of CO₂/(g of adsorbent) for SBA-15–PEHA-70 and 308.3 mg of CO₂/(g of PEHA) for SBA-15–PEHA-50. A two-amine-layer adsorption model was built to interpret the CO₂ adsorption performance. The CO₂ working adsorption capacity decreased with increasing height/diameter ratio; however, the CO₂ breakthrough adsorption capacity increased. Regeneration experiments showed that the CO₂ working adsorption capacity of SBA-15–PEHA remained stable in consecutive adsorption/desorption cycles.