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標題: Thermodynamics and regeneration studies of CO2 adsorption on multiwalled carbon nanotubes
作者: Hsu, S.C.
Lu, C.S.
Su, F.S.
Zeng, W.T.
Chen, W.F.
關鍵字: Carbon nanotubes;Isosteric heat of adsorption;Cyclic CO2 adsorption;greenhouse-gas;activated carbon;molecular-sieve;composite films;natural-gas;flue-gas;capture;separation;zeolites;dioxide
Project: Chemical Engineering Science
期刊/報告no:: Chemical Engineering Science, Volume 65, Issue 4, Page(s) 1354-1361.
Multiwalled carbon nanotubes (CNTs) were fabricated and modified by 3-aminopropyl-triethoxysilane (APTS) solutions to study thermodynamics and regeneration Of CO2 adsorption from gas streams. The CO2 adsorption capacities of CNTs and CNT(APTS) decreased with temperature indicating the exothermic nature of adsorption process while the thermodynamic analysis gave low isosteric heats of adsorption, which are typical for physical adsorption. The cyclic CO2 adsorption on CNT(APTS) showed that the adsorbed CO2 could be effectively desorbed via thermal treatment at 120 degrees C for 25 min while the adsorbed CO2 due to physical interaction could be effectively desorbed via vacuum suction at 0.145 atm for 30 min. If a combination of thermal and vacuum desorption was conducted at 120 degrees C and 0.145 atm, the time for effectively desorbing CO2 could be further shortened to 5 min. The adsorption capacities and the physicochemical properties of CNT(APTS) were preserved during 20 cycles of adsorption and regeneration. These results suggest that the CNT(APTS) can be stably employed in prolonged cyclic operation and they are thus possibly cost-effective sorbents for CO2 capture from flue gases. (C) 2009 Elsevier Ltd. All rights reserved.
ISSN: 0009-2509
DOI: 10.1016/j.ces.2009.10.005
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