| DOI: | 10.1016/j.jcou.2017.06.008
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| Scopus记录号: | 2-s2.0-85026907109
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| 论文题名: | Thermodynamics of Adsorption of Carbon Dioxide on Various Aerogels |
| 作者: | Anas M.; Gönel A.G.; Bozbag S.E.; Erkey C.
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| 刊名: | Journal of CO2 Utilization
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| ISSN: | 22129820
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| 出版年: | 2017
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| 卷: | 21 | | 起始页码: | 82
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| 结束页码: | 88
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| 语种: | 英语
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| 英文关键词: | absolute adsorption
; Aerogel
; CO2 capture
; excess adsorption
; high pressure
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| 英文摘要: | Excess CO2 adsorption isotherms on silica, resorcinol-formaldehyde, carbon, and wheat starch aerogels at 308 K, 318 K, and 328 K and at pressures up to 35 bar were measured using a volumetric method. Total or absolute adsorption isotherms were calculated from experimentally obtained excess adsorption isotherms using the pore volume of each adsorbent. It was found that silica aerogel with the BET surface area of 1158 m2 g-1 had a maximum absolute uptake of 14 mmol g-1 and resorcinol-formaldehyde aerogel (RFA-19) with the BET surface area of 620 m2 g-1 had a maximum uptake of 13 mmol g-1 at 308 K and 35 bar. CO2 adsorption isotherms for silica, resorcinol-formaldehyde, and wheat starch aerogels were well represented with the Langmuir model whereas isotherms for carbon aerogel were fitted with the Freundlich model. It was also found that the excess uptake correlated well with the mesopore surface area of each aerogel at various pressures. The isosteric heat of adorption for each aerogel was also determined from the variation of pressure with temperature at a constant excess uptake. Among all aerogels, wheat starch aerogel had the highest value of -32.1 kJ mol-1 and carbon aerogel had the lowest value of -17.7 kJ mol-1. Adsorption capacities of aerogels determined were comparable with other classes of adsorbents and presents an opportunity for further investigation of aerogels as potential materials for carbon capture especially at high pressures. © 2017 Elsevier Ltd. All rights reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/52640
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| Appears in Collections: | 影响、适应和脆弱性
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| Recommended Citation: | |
Anas M.,Gönel A.G.,Bozbag S.E.,et al. Thermodynamics of Adsorption of Carbon Dioxide on Various Aerogels[J]. Journal of CO2 Utilization,2017-01-01,21
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