Mixed Metal-Organic Framework with Multiple Binding Sites for E fficient C2H2/CO2 Separation.

The C 2 H 2 /CO 2 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 Å for challenging C 2 H 2 /CO 2 separation. This MOF shows not only a remarkable volumetric C 2 H 2 uptake of 133 cm 3 cm -3 but also an excellent C 2 H 2 /CO 2 selectivity of 24 under ambient condition, resulting in the second highest C 2 H 2 -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 C 2 H 2 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 C 2 H 2 /CO 2 separation.

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