Separation of CH<sub>4</sub>/N<sub>2</sub> on ZIF-8 adsorbent and its thermodynamic properties

HU Jiang-liang; SUN Tian-jun; REN Xin-yu; CHANG Li-ping; WANG Shu-dong

Volume 41 Issue 06

Jun. 2013

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Article Navigation > Journal of Fuel Chemistry and Technology > 2013 > 41(06): 754-760

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(06): 754-760.

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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(06): 754-760.

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

1.
Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education and Shanxi Province, Taiyuan 030024, China;
2.
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

Received Date: 2012-11-14
Rev Recd Date: 2013-01-21
Publish Date: 2013-06-30

Abstract

Abstract

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.
- zeolitic imidazolate framework-8,
- adsorptive separation,
- methane,
- nitrogen,
- adsorption heat

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References

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