Paralyzed membrane: Current-driven synthesis of a metal-organic framework with sharpened propene/propane separation
Author(s) -
Sheng Zhou,
Yanying Wei,
Libo Li,
Yifan Duan,
Qianqian Hou,
Lili Zhang,
LiangXin Ding,
Jian Xue,
Haihui Wang,
Jürgen Caro
Publication year - 2018
Publication title -
science advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.928
H-Index - 146
ISSN - 2375-2548
DOI - 10.1126/sciadv.aau1393
Subject(s) - propene , propane , membrane , linker , current (fluid) , metal , separation (statistics) , chemistry , chemical engineering , combinatorial chemistry , materials science , organic chemistry , biochemistry , computer science , catalysis , engineering , machine learning , electrical engineering , operating system
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 (the common cubic phase) for propene/propane separation. FCDS holds great potential to produce high-quality, ultrathin MOF membranes on a large scale.
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