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Citation: HU Jiang-liang, SUN Tian-jun, REN Xin-yu, CHANG Li-ping, WANG Shu-dong. Separation of CH4/N2 on ZIF-8 adsorbent and its thermodynamic properties[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(6): 754-760. shu

Separation of CH4/N2 on ZIF-8 adsorbent and its thermodynamic properties

  • 1.

    1. Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education and Shanxi Province, Taiyuan 030024, China;

  • Corresponding author: WANG Shu-dong, 
  • Received Date: 14 November 2012
    Available Online: 21 January 2013

    Fund Project: 中国科学院知识创新工程创新基金项目(K20110812)。 (K20110812)

  • With triethylamine (TEA) as structure directing agent, ZnSO4 as metal ion source and water as the solvent, zeolitic imidazolate framework-8 (ZIF-8) adsorbent was prepared by hydrothermal synthesis and used in the separation and enrichment of exhausted coal-bed methane. XRD, physical adsorption, dynamic adsorption equilibrium and inverse gas chromatography (IGC) methods were employed to characterize the physical structure, chemical stability, adsorption and separation performance of the ZIF-8 adsorbent; the adsorption thermodynamics of CH4 and N2 on it was also considered. The results indicated that ZIF-8 structure is stable in the acid, alkali and strongly polarized solvent. At 298 K, the separation factor of the ZIF-8 adsorbent towards CH4/N2 is up to 3.4, which is comparable to activated carbon; however, ZIF-8 should be more promising in practical application, because the adsorption heat over it is about 20% lower than that over activated carbon.
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