Dual polarization strategy to enhance CH4 uptake in covalent organic frameworks for coal-bed methane purification

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外文摘要：The purification of low-grade coal-bed methane is extremely important,but challenging,due to the very similar physical properties of CH4 and N2.Herein,we proposed a dual polarization strategy by employing triazine and polyfluoride sites to construct polar pores in COF materials,achieving the efficient separa-tion of CH4 from N2.As expected,the dual polarized F-CTF-1 and F-CTF-2 exhibit higher CH4 adsorption capacity and CH4/N2 selectivity than CTF-1 and CTF-2,respectively.Especially,the CH4 uptake capacity and CH4/N2 selectivity of F-CTF-2 is 1.76 and 1.42 times than that of CTF-2.This work not only developed promising COF materials for CH4/N2 separation,but also provided important guidance for the separation of other adsorbates with similar properties.

外文关键词：

Dual polarization strategyCovalent organic frameworks(COFs)Coal-bed methane purificationChemical/thermal stabilityCycling stability

作者：

Junhua Wang、Xin Lian、Xichuan Cao、Qiao Zhao、Baiyan Li、Xian-He Bu

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作者单位：

School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China

School of Materials Science and Engineering,National Institute for Advanced Materials,TKL of Metal and Molecule-Based Material Chemistry,Nankai University,Tianjin 300350,China

School of Materials Science and Engineering,National Institute for Advanced Materials,TKL of Metal and Molecule Based Material Chemistry,Nankai University,Tianjin 300350,China

School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China

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出版年：

2024

DOI：

10.1016/j.cclet.2023.109180

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCD

影响因子：0.771

ISSN：1001-8417

年,卷(期)：2024.35(8)