CH4/N2 separation on methane molecules grade diameter channel molecular sieves with a CHA-type structure

doi:10.1016/j.cjche.2018.09.007

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (5): 1044-1049.DOI: 10.1016/j.cjche.2018.09.007

• Separation Science and Engineering • 上一篇下一篇

CH₄/N₂ separation on methane molecules grade diameter channel molecular sieves with a CHA-type structure

Hua Shang¹, Yuping Li², Jiaqi Liu¹, Xuan Tang¹, Jiangfeng Yang^1,3, Jinping Li^1,3

1 Research Institute of Special Chemicals, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2 College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
3 Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan 030024, China

收稿日期:2018-07-08 修回日期:2018-08-17 出版日期:2019-05-28 发布日期:2019-06-27
通讯作者: Jiangfeng Yang
基金资助:
We acknowledge financial support from the National Natural Science Foundation of China (Nos. 51672186, 21676175).

CH₄/N₂ separation on methane molecules grade diameter channel molecular sieves with a CHA-type structure

Hua Shang¹, Yuping Li², Jiaqi Liu¹, Xuan Tang¹, Jiangfeng Yang^1,3, Jinping Li^1,3

1 Research Institute of Special Chemicals, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2 College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
3 Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan 030024, China

Received:2018-07-08 Revised:2018-08-17 Online:2019-05-28 Published:2019-06-27
Contact: Jiangfeng Yang
Supported by:
We acknowledge financial support from the National Natural Science Foundation of China (Nos. 51672186, 21676175).

摘要/Abstract

摘要： Samples of methane molecules grade diameter channel CHA-type molecular sieves (Chabazite-K, SAPO-34 and SSZ-13) were investigated using the adsorption separation of CH₄/N₂ mixtures. The isotherms recorded for CH₄ and N₂ follow a typical type-Ι behavior, which were fitted well with the Sips model (R²>0.999) and the selectivity was calculated using IAST theory. The results reveal that Chabazite-K has the highest selectivity (S_CH₄/N₂=5.5). SSZ-13 has the largest capacity, which can adsorb up to a maximum of 30.957 cm³·g^-1 (STP) of CH₄, due to it having the largest pore volume and surface area, but the lowest selectivity (S_CH₄/N₂=2.5). From the breakthrough test, we can conclude that SSZ-13 may be a suitable candidate for the recovery of CH₄ from low concentration methane (CH₄<20%) based on its larger pore volume and higher CH₄ capacity. Chabazite-K is more suited to the separation of high concentration methane (CH₄>50%) due to its higher selectivity.

关键词: Molecular sieves, Adsorption, CH₄/N₂, Separation, Breakthrough

Abstract: Samples of methane molecules grade diameter channel CHA-type molecular sieves (Chabazite-K, SAPO-34 and SSZ-13) were investigated using the adsorption separation of CH₄/N₂ mixtures. The isotherms recorded for CH₄ and N₂ follow a typical type-Ι behavior, which were fitted well with the Sips model (R²>0.999) and the selectivity was calculated using IAST theory. The results reveal that Chabazite-K has the highest selectivity (S_CH₄/N₂=5.5). SSZ-13 has the largest capacity, which can adsorb up to a maximum of 30.957 cm³·g^-1 (STP) of CH₄, due to it having the largest pore volume and surface area, but the lowest selectivity (S_CH₄/N₂=2.5). From the breakthrough test, we can conclude that SSZ-13 may be a suitable candidate for the recovery of CH₄ from low concentration methane (CH₄<20%) based on its larger pore volume and higher CH₄ capacity. Chabazite-K is more suited to the separation of high concentration methane (CH₄>50%) due to its higher selectivity.

Key words: Molecular sieves, Adsorption, CH₄/N₂, Separation, Breakthrough

Hua Shang, Yuping Li, Jiaqi Liu, Xuan Tang, Jiangfeng Yang, Jinping Li. CH₄/N₂ separation on methane molecules grade diameter channel molecular sieves with a CHA-type structure[J]. 中国化学工程学报, 2019, 27(5): 1044-1049.

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CH₄/N₂ separation on methane molecules grade diameter channel molecular sieves with a CHA-type structure

CH₄/N₂ separation on methane molecules grade diameter channel molecular sieves with a CHA-type structure

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