Efficient capture of C_(2)H_(2)from CO_(2)and C_(n)H_(4)by a novel fluorinated anion pillared MOF with flexible molecular sieving effect  

作　　者：Lingyao Wang Nuo Xu Yongqi Hu Wanqi Sun Rajamani Krishna Jiahao Li Yunjia Jiang Simon Duttwyler Yuanbin Zhang 

机构地区：[1]Key Laboratory of the Ministry of Education for Advanced Catalysis Materials,College of Chemistry and Life Sciences,Zhejiang Normal University,Jinhua 321004,China [2]Van’t Hoff Institute for Molecular Sciences,University of Amsterdam,Science Park 904,Amsterdam 1098 XH,the Netherlands [3]Department of Chemistry,Zhejiang University,Hangzhou 310027,China

出　　处：《Nano Research》2023年第2期3536-3541,共6页纳米研究（英文版）

基　　金：support by the National Natural Science Foundation of China(No.21908193);Jinhua Industrial Key Project(No.2021A22648);S.D.acknowledged the financial support by the National Natural Science Foundation of China(No.21871231);the Special Funds for Basic Scientific Research of Zhejiang University(Nos.2019QNA3010 and K20210335);support by the National Natural Science Foundation of China(No.22205207).

摘　　要：The efficient separation of acetylene(C_(2)H_(2))from carbon dioxide(CO_(2))and CnH_(4)(n=1 and 2)to manufacture high purity C_(2)H_(2)and recover other light hydrocarbons is technologically important,while posing significant challenges.Herein,we reported a new TiF62−anion(TIFSIX)pillared metal-organic framework(MOF)ZNU-5(ZNU=Zhejiang Normal University)with ultramicropores for highly selective C_(2)H_(2)capture with low adsorption heat through gate opening based molecular sieving effect.ZNU-5 takes up a large amount of C_(2)H_(2)(128.6 cm^(3)/g)at 1.0 bar and 298 K but excludes CO_(2),CH_(4),and C_(2)H_(4).Such high capacity has never been realized in MOFs with molecular sieving.The breakthrough experiments further confirmed the highly selective C_(2)H_(2)separation performance from multi-component gas mixtures.3.3,2.8,and 2.2 mmol/g of C_(2)H_(2)is captured at ZNU-5 from equimolar C_(2)H_(2)/CO_(2),C_(2)H_(2)/CO_(2)/CH_(4),and C_(2)H_(2)/CO_(2)/CH_(4)/C_(2)H_(4)mixtures,respectively.Furthermore,2.6,2.0,and 1.5 mmol/g of>98%purity C_(2)H_(2)can be recycled from the desorption process.Combining high working capacity,low adsorption heat,as well as good recyclability,ZNU-5 is promising for C_(2)H_(2)purification.

关 键 词：metal-organic frameworks(MOFs) C_(2)H_(2)/CO_(2)separation acetylene recovery molecular sieving flexible MOFs 

分 类 号：O64[理学—物理化学]