SCI和EI收录∣中国化工学会会刊

›› 2016, Vol. 24 ›› Issue (12): 1687-1694.DOI: 10.1016/j.cjche.2016.05.013

• Separation Science and Engineering • Previous Articles     Next Articles

CO2/CH4 and CH4/N2 separation on isomeric metal organic frameworks

Xiaoqing Wang, Libo Li, Jiangfeng Yang, Jinping Li   

  1. Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2016-04-06 Revised:2016-05-17 Online:2017-01-04 Published:2016-12-28
  • Supported by:
    Supported by National Natural Science Foundation of China (No. 21136007, No. 51302184), and the National Research Fund for Fundamental Key Projects (No. 2014CB260402).

CO2/CH4 and CH4/N2 separation on isomeric metal organic frameworks

Xiaoqing Wang, Libo Li, Jiangfeng Yang, Jinping Li   

  1. Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, China
  • 通讯作者: Jiangfeng Yang,Tel.:+863516010550;Fax:+863516111178.E-mail address:yangjiangfeng@tyut.edu.cn
  • 基金资助:
    Supported by National Natural Science Foundation of China (No. 21136007, No. 51302184), and the National Research Fund for Fundamental Key Projects (No. 2014CB260402).

Abstract: Two isomeric metal-organic frameworks (MOFs) with 2-dimensional (2D) and 3-dimensional (3D) topologies both comprised of Cu(II) and OTf (OTf=trifluoromethanesulfonate) ions were synthesized and characterized. The CO2, CH4 and N2 adsorption properties of the two isomeric MOFs were investigated from 263 K to 298 K at 0.1 MPa. The results showed that the 2D MOF exhibited a higher selectivity for CO2 from CO2/CH4 and CH4 from CH4/N2 compared to the 3D MOF, even though it possessed a lower surface area and pore volume. The higher adsorption heats of gases on the 2D MOF inferred the strong adsorption potential energy in the layered MOFs. Dynamic separation experiments using CO2/CH4 and CH4/N2 mixtures on the two MOFs proved that the 2D MOF had a longer elution time than the 3D MOF as well as better separation abilities.

Key words: Metal-organic frameworks, Isomeric frameworks, Adsorption, Separation

摘要: Two isomeric metal-organic frameworks (MOFs) with 2-dimensional (2D) and 3-dimensional (3D) topologies both comprised of Cu(II) and OTf (OTf=trifluoromethanesulfonate) ions were synthesized and characterized. The CO2, CH4 and N2 adsorption properties of the two isomeric MOFs were investigated from 263 K to 298 K at 0.1 MPa. The results showed that the 2D MOF exhibited a higher selectivity for CO2 from CO2/CH4 and CH4 from CH4/N2 compared to the 3D MOF, even though it possessed a lower surface area and pore volume. The higher adsorption heats of gases on the 2D MOF inferred the strong adsorption potential energy in the layered MOFs. Dynamic separation experiments using CO2/CH4 and CH4/N2 mixtures on the two MOFs proved that the 2D MOF had a longer elution time than the 3D MOF as well as better separation abilities.

关键词: Metal-organic frameworks, Isomeric frameworks, Adsorption, Separation