Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202305390
Keywords
Gas Separation; Metal-Organic Framework; Trap for CO2
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Adsorption-based removal of carbon dioxide (CO2) from gas mixtures has shown great potential for solving energy security and environmental sustainability challenges. However, the current CO2-selective sorbents have limited selectivity due to the similar physicochemical properties between CO2 and other gases. In this study, a bioinspired design strategy is used to create a robust, microporous metal-organic framework (MOF) that selectively removes CO2 from various gas mixtures, achieving highly efficient CO2 separations.
Adsorption-based removal of carbon dioxide (CO2) from gas mixtures has demonstrated great potential for solving energy security and environmental sustainability challenges. However, due to similar physicochemical properties between CO2 and other gases as well as the co-adsorption behavior, the selectivity of CO2 is severely limited in currently reported CO2-selective sorbents. To address the challenge, we create a bioinspired design strategy and report a robust, microporous metal-organic framework (MOF) with unprecedented [Mn-86] nanocages. Attributed to the existence of unique enzyme-like confined pockets, strong coordination interactions and dipole-dipole interactions are generated for CO2 molecules, resulting in only CO2 molecules fitting in the pocket while other gas molecules are prohibited. Thus, this MOF can selectively remove CO2 from various gas mixtures and show record-high selectivities of CO2/CH4 and CO2/N-2 mixtures. Highly efficient CO2/C2H2, CO2/CH4, and CO2/N-2 separations are achieved, as verified by experimental breakthrough tests. This work paves a new avenue for the fabrication of adsorbents with high CO2 selectivity and provides important guidance for designing highly effective adsorbents for gas separation.
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