Construction of a novel nickel-based MOF with accessible oxygen sites for efficient CH4/N2 separation

Enriching coal-bed methane to provide pure methane is promising and attractive. However, it is challenging due to the similar properties of CH4 and N2. In this work, a novel nickel-based metal–organic framework (named TUTJ-201Ni) with a high density of accessible oxygen sites was synthesized for CH4...

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Bibliographic Details
Published in:Inorganic chemistry frontiers 2024-06, Vol.11 (13), p.3889-3896
Main Authors: Zhang, Feifei, Tang, Yuhao, Zhao, Zhiwei, Lu, Mengyue, Wang, Xiaoqing, Li, Jinping, Yang, Jiangfeng
Format: Article
Language:English
Subjects:
Accessibility
Adsorption
Atomic structure
Bonding strength
Chemical bonds
Hydrogen bonding
Metal-organic frameworks
Methane
Nickel
Oxygen atoms
Oxygen enrichment
Separation
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Summary:Enriching coal-bed methane to provide pure methane is promising and attractive. However, it is challenging due to the similar properties of CH4 and N2. In this work, a novel nickel-based metal–organic framework (named TUTJ-201Ni) with a high density of accessible oxygen sites was synthesized for CH4/N2 separation. From the structure, oxygen atoms from ligands and μ2-hydroxyl are densely distributed on the surface of rhombic channels. Gas adsorption measurements showed that TUTJ-201Ni exhibited high CH4 uptake over N2. CH4/N2 selectivity at 298 K and 1.0 bar was calculated to be 7.2. Modeling studies indicated that the pore centers surrounded with accessible oxygen atoms are the optimal bonding sites. The stronger adsorption affinity of CH4 can be attributed to multiple hydrogen bonding. The exceptional CH4/N2 separation performance of this material was further evaluated using breakthrough experiments.
ISSN:2052-1545
2052-1553
DOI:10.1039/d4qi01008f