TY - JOUR
T1 - Amine modified mesocellular siliceous foam (MCF) as a sorbent for CO(2)
AU - Subagyono, Dirgarini
AU - Liang, Zhijian
AU - Knowles, Gregory
AU - Chaffee, Alan
PY - 2011
Y1 - 2011
N2 - Adsorption is considered a promising method for carbon capture. CO(2) adsorbents take a variety of forms - but one approach is to fill mesoporous substrates with a polymeric CO(2) selective sorbent. SBA-15 and mesocellular siliceous foam (MCF) are high pore volume, high surface area ordered mesoporous materials for which modification with amine should result in high capacity, highly selective adsorbents. SBA-15 and MCF were separately loaded with approximately one pore volume equivalent of linear polyethyleneimine (PEI) (My, =2500) or branched PEI (M(W) = 1200). CO(2) adsorption/desorption isotherms under dry CO(2) were obtained at 75, 105 and 115 degrees C. The CO(2) adsorption/desorption kinetics were improved with temperature, though the CO(2) capacities generally decreased. The adsorption capacity for MCF loaded with branched PEI at 105 and 115 degrees C were 151 and 133 mg/g adsorbent, respectively (in 50 CO(2)/Ar, 20 min adsorption time). These are significantly higher than the adsorption capacity observed for SBA-15 loaded with branched PEI under same conditions, which were 107 and 83 mg/g adsorbent, respectively. Thus the results indicate that, on a unit mass basis, amine modified MCF s are potentially better adsorbents than amine modified SBA-15 for CO(2) capture at modestly elevated temperature in a vacuum swing adsorption process.
AB - Adsorption is considered a promising method for carbon capture. CO(2) adsorbents take a variety of forms - but one approach is to fill mesoporous substrates with a polymeric CO(2) selective sorbent. SBA-15 and mesocellular siliceous foam (MCF) are high pore volume, high surface area ordered mesoporous materials for which modification with amine should result in high capacity, highly selective adsorbents. SBA-15 and MCF were separately loaded with approximately one pore volume equivalent of linear polyethyleneimine (PEI) (My, =2500) or branched PEI (M(W) = 1200). CO(2) adsorption/desorption isotherms under dry CO(2) were obtained at 75, 105 and 115 degrees C. The CO(2) adsorption/desorption kinetics were improved with temperature, though the CO(2) capacities generally decreased. The adsorption capacity for MCF loaded with branched PEI at 105 and 115 degrees C were 151 and 133 mg/g adsorbent, respectively (in 50 CO(2)/Ar, 20 min adsorption time). These are significantly higher than the adsorption capacity observed for SBA-15 loaded with branched PEI under same conditions, which were 107 and 83 mg/g adsorbent, respectively. Thus the results indicate that, on a unit mass basis, amine modified MCF s are potentially better adsorbents than amine modified SBA-15 for CO(2) capture at modestly elevated temperature in a vacuum swing adsorption process.
UR - http://www.sciencedirect.com.ezproxy.lib.monash.edu.au/science/article/pii/S0263876211000876
U2 - 10.1016/j.cherd.2011.02.019
DO - 10.1016/j.cherd.2011.02.019
M3 - Article
SN - 0263-8762
VL - 89
SP - 1647
EP - 1657
JO - Chemical Engineering Research and Design
JF - Chemical Engineering Research and Design
IS - 9
ER -