TY - JOUR
T1 - CO2 adsorption performance for amine grafted particulate silica aerogels
AU - Linneen, Nick N.
AU - Pfeffer, Robert
AU - Lin, Jerry
N1 - Funding Information:
The authors gratefully acknowledge support for this research from National Science Foundation Grant CBET 0966959. We also thank Dr. Wendy Pryce Lewis of Cabot Corporation for supplying the Nanogel particles used in our experiments.
PY - 2014/10/15
Y1 - 2014/10/15
N2 - A series of amine grafted CO2 sorbents were prepared by functionalizing mono, di, and tri-amine substituted trialkoxysilanes on a particulate silica aerogel manufactured by Cabot Corp. The CO2 adsorption performance, textural properties, and the nitrogen content of the functionalized aerogels were investigated using CO2 gravimetric adsorption analysis, nitrogen porosimetry, and CHN elemental analysis. The synthesis variables involved in the grafting procedure were studied independently toward obtaining a high performing CO2 capture sorbent. Of the mono, di, and tri-amine silanes, the tri-amine grafted aerogel obtained the highest adsorption capacity and was further investigated to determine the effects of synthesis conditions on adsorption performance. For anhydrous (dry) grafting the optimum conditions for the silica aerogel was 95°C and a 2:1 silane:silica ratio that resulted in an adsorption capacity of 1.76mmol/g. For hydrous (wet) grafting the optimum temperature was 95°C and a water addition of 300mg H2O/g of silica where the sorbent achieved a capacity of 2.61mmol/g. The same sorbent also showed excellent cyclic stability maintaining a working capacity of 2.30mmol/g for 100 cycles.
AB - A series of amine grafted CO2 sorbents were prepared by functionalizing mono, di, and tri-amine substituted trialkoxysilanes on a particulate silica aerogel manufactured by Cabot Corp. The CO2 adsorption performance, textural properties, and the nitrogen content of the functionalized aerogels were investigated using CO2 gravimetric adsorption analysis, nitrogen porosimetry, and CHN elemental analysis. The synthesis variables involved in the grafting procedure were studied independently toward obtaining a high performing CO2 capture sorbent. Of the mono, di, and tri-amine silanes, the tri-amine grafted aerogel obtained the highest adsorption capacity and was further investigated to determine the effects of synthesis conditions on adsorption performance. For anhydrous (dry) grafting the optimum conditions for the silica aerogel was 95°C and a 2:1 silane:silica ratio that resulted in an adsorption capacity of 1.76mmol/g. For hydrous (wet) grafting the optimum temperature was 95°C and a water addition of 300mg H2O/g of silica where the sorbent achieved a capacity of 2.61mmol/g. The same sorbent also showed excellent cyclic stability maintaining a working capacity of 2.30mmol/g for 100 cycles.
KW - Adsorbents
KW - Amine grafting
KW - Carbon capture
KW - Silica aerogel
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U2 - 10.1016/j.cej.2014.05.087
DO - 10.1016/j.cej.2014.05.087
M3 - Article
AN - SCOPUS:84902476619
SN - 1385-8947
VL - 254
SP - 190
EP - 197
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -