Engineering Supramolecular Binding Sites in a Chemically Stable Metal‐Organic Framework for Simultaneous High C2H2 Storage and Separation

Developing porous materials to overcome the trade‐off between adsorption capacity and selectivity for C2H2/CO2 separation remains a challenge. Herein, we report a stable HKUST‐1‐like MOF (ZJU‐50a), featuring large cages decorated with high density of supramolecular binding sites to achieve both high...

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Published inAngewandte Chemie International Edition Vol. 61; no. 41
Main Authors Shao, Kai, Wen, Hui‐Min, Liang, Cong‐Cong, Xiao, Xiaoyan, Gu, Xiao‐Wen, Chen, Banglin, Qian, Guodong, Li, Bin
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 10.10.2022
EditionInternational ed. in English
Subjects
Acetylene
Binding sites
Carbon dioxide
Gas Separation
Metal-organic frameworks
Porous Materials
Selectivity
Separation
Storage capacity
Supramolecular Binding Sites
Trade-off
Van Arkel process
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Summary:Developing porous materials to overcome the trade‐off between adsorption capacity and selectivity for C2H2/CO2 separation remains a challenge. Herein, we report a stable HKUST‐1‐like MOF (ZJU‐50a), featuring large cages decorated with high density of supramolecular binding sites to achieve both high C2H2 storage and selectivity. ZJU‐50a exhibits one of the highest C2H2 storage capacity (192 cm3 g−1) and concurrently high C2H2/CO2 selectivity (12) at 298 K and 1 bar. Single‐crystal X‐ray diffraction studies on gas‐loaded ZJU‐50a crystal unveil that the incorporated supramolecular binding sites can selectively take up C2H2 molecule but not CO2 to result in both high C2H2 storage and selectivity. Breakthrough experiments validated its separation performance for C2H2/CO2 mixtures, providing a high C2H2 recovery capacity of 84.2 L kg−1 with 99.5 % purity. This study suggests a novel strategy of engineering supramolecular binding sites into MOFs to overcome the trade‐off for this separation. We developed a novel strategy by engineering abundant supramolecular binding sites into a chemically stable HKUST‐1‐like MOF (ZJU‐50a) to achieve simultaneously high C2H2 storage and selectivity, breaking the trade‐off between adsorption capacity and selectivity for C2H2/CO2 separation.
Bibliography:These authors contributed equally to this work.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202211523