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Mixed Metal-Organic Framework with Multiple Binding Sites for Efficient C2 H2 /CO2 Separation.

ABSTRACT: The separation of C2 H2 /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 C2 H2 /CO2 separation. This MOF shows not only a remarkable volumetric C2 H2 uptake of 133?cm3 ?cm-3 , but also an excellent C2 H2 /CO2 selectivity of 24 under ambient conditions, resulting in the second highest C2 H2 -capture amount of 4.54?mol?L-1 , thus outperforming most previous benchmark materials. The separation performance of this material is driven by ?-? stacking and multiple intermolecular interactions between C2 H2 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 C2 H2 /CO2 separation.

SUBMITTER: Gao J 

PROVIDER: S-EPMC7935436 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Mixed Metal-Organic Framework with Multiple Binding Sites for Efficient C<sub>2</sub> H<sub>2</sub> /CO<sub>2</sub> Separation.

Gao Junkuo J   Qian Xuefeng X   Lin Rui-Biao RB   Krishna Rajamani R   Wu Hui H   Zhou Wei W   Chen Banglin B  

Angewandte Chemie (International ed. in English) 20200130 11

The separation of C<sub>2</sub> H<sub>2</sub> /CO<sub>2</sub> 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)<sub>4</sub> ] (FeNi-M'MOF, pyz=pyrazine), with multiple functional sites and compact one-dimensional channels of about 4.0 Å for C<sub>2</sub> H<sub>2</sub> /CO<sub>2</sub> separation. This MOF shows not only a remarkable volumetric C<sub>2</sub> H<sub>2</sub> upta  ...[more]

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