Paralyzed membrane: Current-driven synthesis of a metal-organic framework with sharpened propene/propane separation

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Zhou, S.; Wei, Y.; Li, L.; Duan, Y.; Hou, Q. et al.: Paralyzed membrane: Current-driven synthesis of a metal-organic framework with sharpened propene/propane separation. In: Science Advances 4 (2018), Nr. 10, eaau1393. DOI: https://doi.org/10.1126/sciadv.aau1393

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Abstract: 
Metal-organic framework (MOF) membranes show great promise for propene/propane separation, yet a sharp molecular sieving has not been achieved due to their inherent linker mobility. Here, zeolitic imidazolate framework ZIF-8-type membranes with suppressed linker mobility are prepared by a fast current-driven synthesis (FCDS) strategy within 20 min, showing sharpened molecular sieving for propene/propane separation with a separation factor above 300. During membrane synthesis, the direct current promotes the metal ions and ligands to assemble into inborn-distorted and stiffer frameworks with ZIF-8-Cm (a newly discovered polymorph of ZIF-8) accounting for 60 to 70% of the membrane composition. Molecular dynamics simulations further verify that ZIF-8-Cm is superior to ZIF-8-I-43m (the common cubic phase) for propene/propane separation. FCDS holds great potential to produce high-quality, ultrathin MOF membranes on a large scale.
License of this version: CC BY-NC 4.0
Document Type: article
Publishing status: publishedVersion
Issue Date: 2018
Appears in Collections:Naturwissenschaftliche Fakultät

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1 image of flag of Germany Germany 23 85.19%
2 image of flag of China China 3 11.11%
3 image of flag of United Arab Emirates United Arab Emirates 1 3.70%

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