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Sol-gel asynchronous crystallization of ultra-selective metal-organic framework membranes for gas separation

Abstract

Metal-organic framework (MOF) membranes possess superior separation performance, but their inferior processability is an intrinsic drawback. Herein, we report a scalable and versatile sol-gel transformation strategy to synthesize MOF membranes by two steps of precursor-coating for gel dispersion and thermal-treatment for membrane growth, similar to processing of polymeric membranes. The asynchronous crystallization between bottom and top of gels found here is critical for the formation of defect-free MOF membranes. The prepared ZIF-8 membranes have impressive performance in hydrogen purification and hydrocarbon separation, with H2/CH4, H2/C3H8 and C3H6/C3H8 selectivities up to 30, 9000 and 200, respectively. Moreover, sol-gel transformation can deposit MOF layers with controllable thickness, down to 130 nm, on both discs and hollow fibers without deterioration in performance through a solvent-/precursor-saving manner.

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Publication details

The article was received on 25 Jun 2018, accepted on 03 Aug 2018 and first published on 03 Aug 2018


Article type: Communication
DOI: 10.1039/C8TA06083E
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Sol-gel asynchronous crystallization of ultra-selective metal-organic framework membranes for gas separation

    W. Li, W. Wu, Z. Li, J. Shi and Y. Xia, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA06083E

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