ZIF-8吸附剂上CH<sub>4</sub>/N<sub>2</sub>的吸附分离性能与热力学性质

胡江亮; 孙天军; 任新宇; 常丽萍; 王树东

ZIF-8吸附剂上CH₄/N₂的吸附分离性能与热力学性质

1.
太原理工大学煤科学与技术教育部和山西省重点实验室, 山西太原 030024;
2.
中国科学院大连化学物理研究所, 辽宁大连 116023

基金项目: 中国科学院知识创新工程创新基金项目(K20110812)。

详细信息

通讯作者:
王树东, Tel: 0411-84379052; E-mail: wangsd@dicp.ac.cn。

中图分类号: TQ028.1
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出版历程
- 收稿日期: 2012-11-14
- 修回日期: 2013-01-21
- 刊出日期: 2013-06-30

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

摘要

摘要: 将沸石咪唑酯骨架结构材料应用于抽放煤层甲烷的浓缩净化研究。以三乙胺(TEA)为导向剂,ZnSO₄为金属离子源,水为溶剂,采用水热合成法进行了ZIF-8吸附剂的制备。采用XRD、物理吸附、动态吸附分离和反相气相色谱(IGC)等方法对ZIF-8的物理结构、化学稳定性、吸附分离性能和热力学性质进行了研究。结果表明,ZIF-8具有良好的化学稳定性,能够在强酸、强碱和强极性的溶剂中保持结构的稳定性;在298 K时,ZIF-8对CH₄/N₂的分离因子达到3.4,与活性炭相当,但CH₄、N₂在ZIF-8上的吸附热比在活性炭上低20%左右。
- ZIF-8 /
- 吸附分离 /
- 甲烷 /
- 氮气 /
- 吸附热
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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参考文献(20)

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