Phase balance and selectivity of CH4/CO2 adsorption on MIL-101

被引：0

作者：

Xia, Qi-Bin ^{[1
]}

Miao, Jin-Peng ^{[1
]}

Sun, Xue-Jiao ^{[1
]}

Zhou, Xin ^{[1
]}

Li, Zhong ^{[1
]}

Xi, Hong-Xia ^{[1
]}

机构：

[1] School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong

来源：

Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | 2013年 / 41卷 / 12期

关键词：

Adsorption isotherm; Adsorption selectivity; Carbon dioxide; Ideal adsorbed solution theory; Methane; Porous material MIL-101;

D O I：

10.3969/j.issn.1000-565X.2013.12.005

中图分类号：

学科分类号：

摘要：

In this paper, the adsorption isotherms of CH4 and CO2 on MIL-101 were obtained by means of the gravi-metric method at 298, 303, 308 and 313 K, and the corresponding isosteric adsorption heat was estimated. Then, the pure gas adsorption was calculated by using the DL-IAST model, and the adsorption selectivity of CO2 on MIL-101 was discussed. The results show that (1) the adsorption capacity of pure CO2 on MIL-101 is up to 14.51 mmol/g at 298 K and 2500 kPa, which is much higher than that on activated carbon, zeolite and molecular sieve under similar conditions; (2) the isotherms of pure CO2 and CH4 well accord with the Double-Langmuir model, which shows the presence of two adsorption sites; (3) the isosteric adsorption heat of CO2 on MIL-101 ranges from 19.3 to 25.5 kJ/mol; (4) as compared with CH4, CO2 is of higher surface free energy for its interaction with the framework of MIL-101; (5) the adsorption selectivity index of CO2 over CH4 on MIL-101 is up to 5.6 at 298 K and 250 kPa; and (6) the adsorption selectivity of CO2 over CH4 gradually decreases with the increase of pressure and the concentration of CO2 in CH4/CO2 mixture.

引用

页码：24 / 28+42

共 20 条

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