Separation of acetylene(C_(2)H_(2))from carbon dioxide(CO_(2))is important in industry to produce high purity C_(2)H_(2)but challenged by the close physical properties.Herein,a novel microporous TIFSIX anion pillared ...Separation of acetylene(C_(2)H_(2))from carbon dioxide(CO_(2))is important in industry to produce high purity C_(2)H_(2)but challenged by the close physical properties.Herein,a novel microporous TIFSIX anion pillared metal organic framework ZNU-7 with abundant electronegative sites was prepared for efficient C_(2)H_(2)/CO_(2)adsorption separation.The non-coordinating fluorine atoms in the large pores selectively capture C_(2)H_(2)from CO_(2)by hydrogen bonding.The C_(2)H_(2)uptake capacity on ZNU-7 is as high as 92.1 cm^(3)g^(-1),over 2.5 fold of the CO_(2)uptake.The modest C_(2)H_(2)adsorption heat of 35.3 kJ mol^(-1) allows the facile desorption and regeneration of ZNU-7.The much stronger binding of C_(2)H_(2)compared to CO_(2)was further revealed by DFT calculations.The practical separation ability was confirmed by breakthrough experiments using C_(2)H_(2)/CO_(2)gas mixtures with good recyclability.The dynamic separation factor of 3.0 for an equimolar C_(2)H_(2)/CO_(2)mixture is comparable to those of many benchmark materials.展开更多
基金supported by the Natural Science Foundation of China(No.22205207 and 21908193)the Jinhua Industrial Key Project(2021A22648)the Open Research Fund of Key Laboratory of the Ministry of Education for Advanced Catalysis Materials and Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces,Zhejiang Normal University(KLMEACM202111).
文摘Separation of acetylene(C_(2)H_(2))from carbon dioxide(CO_(2))is important in industry to produce high purity C_(2)H_(2)but challenged by the close physical properties.Herein,a novel microporous TIFSIX anion pillared metal organic framework ZNU-7 with abundant electronegative sites was prepared for efficient C_(2)H_(2)/CO_(2)adsorption separation.The non-coordinating fluorine atoms in the large pores selectively capture C_(2)H_(2)from CO_(2)by hydrogen bonding.The C_(2)H_(2)uptake capacity on ZNU-7 is as high as 92.1 cm^(3)g^(-1),over 2.5 fold of the CO_(2)uptake.The modest C_(2)H_(2)adsorption heat of 35.3 kJ mol^(-1) allows the facile desorption and regeneration of ZNU-7.The much stronger binding of C_(2)H_(2)compared to CO_(2)was further revealed by DFT calculations.The practical separation ability was confirmed by breakthrough experiments using C_(2)H_(2)/CO_(2)gas mixtures with good recyclability.The dynamic separation factor of 3.0 for an equimolar C_(2)H_(2)/CO_(2)mixture is comparable to those of many benchmark materials.
