期刊
CHEMSUSCHEM
卷 12, 期 19, 页码 4405-4411出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201902248
关键词
carbon capture; hydrogen bonds; membranes; metal-organic frameworks; separations
资金
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy
- Laboratory Directed Research and Development Program of Lawrence Berkeley National Laboratory under U.S. Department of Energy [DE-AC02-05CH11231]
- Department of Energy [DE-IA0000018]
Membrane separation technology provides substantial savings in energy and cost for molecular separations in chemical industry, ideally complementing conventional thermally driven separation approaches. However, current membranes are subject to limitations, primarily lying in the Robeson permeability-selectivity upper bound limits. In this study, hydroxy metal-organic framework (MOF)/polyimide mixed-matrix membranes are found to enable high separation performance for applications including CO2 capture and hydrogen purification while offering enhanced compatibility with state-of-the-art membrane-manufacturing processes. The mixed-matrix membranes exceed the present Robeson upper bounds with H-2 and CO2 permeabilities of 907 and 650 Barrers, respectively and H-2/CH4 and CO2/CH4 selectivities of 45 and 32, respectively. The unparalleled performance results from intimate interactions at the boundary of the hydroxy MOFs and carboxylic polymers through strong hydrogen bonds. The principle of design opens the door to highly permeable membranes with synergistic compatibility with established membrane manufacturing platforms for energy-efficient molecular separations.
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