Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (12): 24-28,42.doi: 10.3969/j.issn.1000-565X.2013.12.005

• Chemistry,Chemical & Energy Engineering • Previous Articles     Next Articles

Phase Balance and Selectivity of CH4 /CO2Adsorption on MIL-101

Xia Qi- bin Miao Jin- peng Sun Xue- jiao Zhou Xin Li Zhong Xi Hong- xia   

  1. School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2013-06-27 Revised:2013-08-22 Online:2013-12-25 Published:2013-11-19
  • Contact: 夏启斌(1974-)，男，副研究员，主要从事环境功能材料应用基础及技术研究． E-mail:qbxia@scut.edu.cn
  • About author:夏启斌(1974-)，男，副研究员，主要从事环境功能材料应用基础及技术研究．
  • Supported by:

    国家 “973” 计划项目子课题(2013CB733506);国家自然科学基金资助项目(21276092);广东省科技计划项目(2011B010100030)

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Abstract:

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 313K,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-101was discussed.The results show that (1) the adsorption capacity of pure CO2 on MIL-101 is up to 14.51mmol/g at298K and 2500kPa,which is much higher than that on activated carbon,zeolite and molecular sieve under similarconditions; (2) the isotherms of pure CO2 and CH4 well accord with the Double- Langmuir model,which shows thepresence of two adsorption sites; (3) the isosteric adsorption heat of CO2 on MIL-101 ranges from 19,3 to 25,5kJ/mol;(4) as compared with CH 4 ,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 298K and 250kPa; and (6) theadsorption selectivity of CO2 over CH4 gradually decreases with the increase of pressure and the concentration of CO2 in CH4 /CO2 mixture.

Key words: methane, carbon dioxide, porous material MIL-101, ideal adsorbed solution theory, adsorption selec-tivity, adsorption isotherm

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