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Mixed Metal-Organic Framework with Multiple Binding Sites for Efficient C2H2/CO2 Separation



Junkuo Gao, Xuefeng Qian, Rui-Biao Lin, Rajamani Krishna, Hui Wu, Wei Zhou, Banglin Chen


The C2H2/CO2 separation is particularly challenging owing to their high similarity in physical properties and molecular sizes, but of industrial significance. Herein we report 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 4.0 angstrom} for challenging 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 condition, resulting in the second highest C2H2-captured amount of 4.54 mol L−1 that outperforms most previous benchmark materials. The separation performance of this material has been validated by dynamic breakthrough and neutron diffraction experiments, which is driven by π-π stacking and multiple intermolecular interactions between C2H2 molecules and the binding sites of FeNi-M'MOF. Besides, this material can be facilely synthesized by mixing method at room temperature and is water stable, jointly highlighting FeNi-M'MOF as a promising material for C2H2/CO2 separation.
Angewandte Chemie-International Edition


Porous Materials, Gas Adsorption, Gas Separation


Gao, J. , Qian, X. , Lin, R. , Krishna, R. , Wu, H. , Zhou, W. and Chen, B. (2020), Mixed Metal-Organic Framework with Multiple Binding Sites for Efficient C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> Separation, Angewandte Chemie-International Edition, [online], (Accessed May 23, 2024)


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Created March 3, 2020, Updated October 12, 2021