吸附
微型多孔材料
碳化
碳纤维
吸收(声学)
巴(单位)
体积热力学
分子
金属有机骨架
材料科学
分子间力
热力学
打赌理论
多孔性
物理化学
化学
化学工程
有机化学
工程类
复合材料
复合数
物理
气象学
作者
Wojciech Kukułka,Krzysztof Cendrowski,Beata Michalkiewicz,Ewa Mijowska
出处
期刊:RSC Advances
[Royal Society of Chemistry]
日期:2019-01-01
卷期号:9 (32): 18527-18537
被引量:86
摘要
In our study we prepared MOF-5 derived carbon to reveal the thermodynamics of CO2 absorption processes in great detail. Porous carbon material was prepared from a metal-organic framework (MOF-5) via carbonization at 1000 °C. The obtained structure consists only of carbon and exhibits a BET specific surface area, total pore volume and micropore volume of 1884 m2 g-1, 1.84 cm3 g-1 and 0.59 cm3 g-1, respectively. Structural analysis allowed the assumption that this material is an ideal candidate for efficient CO2 absorption. The CO2 uptake was 2.43 mmol g-1 at 25 °C and 1 bar. Additionally, the absorption over a wide range of temperatures (25, 40, 60, 80 and 100 °C) and pressures (in range of 0-40 bar) was investigated. It is shown that the CO2 absorption isotherm fits a multitemperature Sips model. The calculated Sips equation parameters allows the isosteric heat of adsorption to be obtained. The isosteric heat of adsorption for CO2 decreased substantially with an increase in surface coverage by gas molecules. This indicates a negligible intermolecular interaction between CO2 molecules. A decrease in the isosteric heat of adsorption with surface coverage is a result of the disappearance of favourable adsorption sites.
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