Zeolitic imidazolate framework membranes made by ligand-induced permselectivation

Zeolitic imidazolate framework (ZIF) membranes are emerging as a promising energy-efficient separation technology. However, their reliable and scalable manufacturing remains a challenge. We demonstrate the fabrication of ZIF nanocomposite membranes by means of an all-vapor-phase processing method ba...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2018-09, Vol.361 (6406), p.1008-1011
Main Authors: Ma, Xiaoli, Kumar, Prashant, Mittal, Nitish, Khlyustova, Alexandra, Daoutidis, Prodromos, Mkhoyan, K Andre, Tsapatsis, Michael
Format: Article
Language:English
Subjects:
Aluminum oxide
Atomic layer epitaxy
Energy efficiency
Fabrication
Ligands
Manufacturing
Membranes
Metal-organic frameworks
Nanocomposites
Porosity
Porous materials
Propane
Propylene
Separation
Vapors
Zinc oxide
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Summary:Zeolitic imidazolate framework (ZIF) membranes are emerging as a promising energy-efficient separation technology. However, their reliable and scalable manufacturing remains a challenge. We demonstrate the fabrication of ZIF nanocomposite membranes by means of an all-vapor-phase processing method based on atomic layer deposition (ALD) of ZnO in a porous support followed by ligand-vapor treatment. After ALD, the obtained nanocomposite exhibits low flux and is not selective, whereas after ligand-vapor (2-methylimidazole) treatment, it is partially transformed to ZIF and shows stable performance with high mixture separation factor for propylene over propane (an energy-intensive high-volume separation) and high propylene flux. Membrane synthesis through ligand-induced permselectivation of a nonselective and impermeable deposit is shown to be simple and highly reproducible and holds promise for scalability.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.aat4123