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

Published

March 4, 2020

Author(s)

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

Abstract

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.

Citation

Angewandte Chemie-International Edition

Volume

59

Issue

11

Pub Type

Journals

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Keywords

Porous Materials, Gas Adsorption, Gas Separation

Citation

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 C₂H₂/CO₂ Separation, Angewandte Chemie-International Edition, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929385 (Accessed October 10, 2025)