Mixed Metal–Organic Framework with Multiple Binding Sites for Efficient C2H2/CO2 Separation |
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| Authors: | Prof Junkuo Gao Xuefeng Qian Dr Rui-Biao Lin Dr Rajamani Krishna Dr Hui Wu Dr Wei Zhou Prof Banglin Chen |
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| Institution: | 1. Institute of Functional Porous Materials, The Key laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018 China;2. Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249-0698 USA;3. Van't Hoff Institute of Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands;4. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899-6102 USA |
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| Abstract: | The separation of C2H2/CO2 is particularly challenging owing to their similarities in physical properties and molecular sizes. Reported here is a mixed metal–organic framework (M′MOF), Fe(pyz)Ni(CN)4] ( FeNi-M′MOF , pyz=pyrazine), with multiple functional sites and compact one-dimensional channels of about 4.0 Å for C2H2/CO2 separation. This MOF shows not only a remarkable volumetric C2H2 uptake of 133 cm3 cm−3, but also an excellent C2H2/CO2 selectivity of 24 under ambient conditions, resulting in the second highest C2H2-capture amount of 4.54 mol L−1, thus outperforming most previous benchmark materials. The separation performance of this material is driven by π–π stacking and multiple intermolecular interactions between C2H2 molecules and the binding sites of FeNi-M′MOF . This material can be facilely synthesized at room temperature and is water stable, highlighting FeNi-M′MOF as a promising material for C2H2/CO2 separation. |
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| Keywords: | Acetylen Adsorption Gastrennung Eisen Metall-organische Gerüste |
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