Dehydration‐Induced Cluster Consolidation in a Metal‐Organic Framework for Sieving Hexane Isomers

Metal‐organic frameworks (MOFs) that exhibit dynamic phase‐transition behavior under external stimuli could have great potential in adsorptive separations. Here we report on a zinc‐based microporous MOF (JNU‐80) and its reversible transformation between two crystalline phases: large pore (JNU‐80‐LP)...

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Published in:Angewandte Chemie International Edition 2024-07, Vol.63 (27), p.e202403209-n/a
Main Authors: Jiang, Zhi‐Jie, Wang, Ying, Luo, Dong, Wei, Rong‐Jia, Lu, Weigang, Li, Dan
Format: Article
Language:English
Subjects:
Adsorptivity
cluster consolidation
Clusters
Composite materials
Consolidation
Dehydration
energy-efficient
External stimuli
Fabrication
Heat treatment
Heat treatments
hexane isomers
Hexanes
Isomers
liquid extraction
Metal-organic frameworks
Polymer matrix composites
Polymers
Room temperature
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Summary:Metal‐organic frameworks (MOFs) that exhibit dynamic phase‐transition behavior under external stimuli could have great potential in adsorptive separations. Here we report on a zinc‐based microporous MOF (JNU‐80) and its reversible transformation between two crystalline phases: large pore (JNU‐80‐LP) and narrow pore (JNU‐80‐NP). Specifically, JNU‐80‐LP can undergo a dehydration‐induced cluster consolidation under heat treatment, resulting in JNU‐80‐NP with a reduced channel that allows exclusion of di‐branched hexane isomers while high adsorption of linear and mono‐branched hexane isomers. We further demonstrate the fabrication of MOF‐polymer composite (JNU‐80‐NP‐block) and its application in the purification of di‐branched isomers from liquid‐phase hexane mixtures (98 % di‐branched) at room temperature, affording the di‐branched hexane isomers with 99.5 % purity and close to 90 % recovery rate over ten cycles. This work illustrates an interesting dehydration‐induced cluster consolidation in MOF structure and the ensuing channel shrinkage for sieving di‐branched hexane isomers, which may have important implications for the development of MOFs with dynamic behavior and their potential applications in non‐thermal driven separation technologies. The dehydration‐induced cluster consolidation renders JNU‐80‐NP a shrinkage of the 1D channels in the c‐axis direction, allowing complete exclusion of di‐branched hexane isomers while maintaining high adsorption of linear and mono‐branched hexane isomers.
ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.202403209