Dual polarization strategy to enhance CH_(4) uptake in covalent organic frameworks for coal-bed methane purification  

作　　者：Junhua Wang Xin Lian Xichuan Cao Qiao Zhao Baiyan Li Xian-He Bu 

机构地区：[1]School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China [2]School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China [3]School of Materials Science and Engineering,National Institute for Advanced Materials,TKL of Metal and Molecule-Based Material Chemistry,Nankai University,Tianjin 300350,China

出　　处：《Chinese Chemical Letters》2024年第8期545-548,共4页中国化学快报（英文版）

基　　金：supported by National Key R&D Program of China(No.2022YFA1503300);National Natural Science Foundation of China(Nos.21978138,22035003);the Fundamental Research Funds for the Central Universities(Nankai University);the Haihe Laboratory of Sustainable Chemical Transformations(No.YYJC202101).

摘　　要：The purification of low-grade coal-bed methane is extremely important,but challenging,due to the very similar physical properties of CH_(4)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 CH_(4)from N2.As expected,the dual polarized F-CTF-1 and F-CTF-2 exhibit higher CH_(4)adsorption capacity and CH_(4)/N_(2)selectivity than CTF-1 and CTF-2,respectively.Especially,the CH4 uptake capacity and CH_(4)/N_(2)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/N_(2)separation,but also provided important guidance for the separation of other adsorbates with similar properties.

关 键 词：Dual polarization strategy Covalent organic frameworks(COFs) Coal-bed methane purification Chemical/thermal stability Cycling stability 

分 类 号：TQ424[化学工程] TE64[石油与天然气工程—油气加工工程]