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http://dx.doi.org/10.9713/kcer.2014.52.3.340

Preparation and Gas Permeability of ZIF-7 Membranes Prepared via Two-step Crystallization Technique  

Li, Fang (College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University)
Li, Qiming (College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University)
Bao, Xinxia (College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University)
Gui, Jianzhou (College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University)
Yu, Xiaofei (College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University)
Publication Information
Korean Chemical Engineering Research / v.52, no.3, 2014 , pp. 340-346 More about this Journal
Abstract
Continuous and dense ZIF-7 membranes were successfully synthesized on ${\alpha}-Al_2O_3$ porous substrate via two-step crystallization technique. ZIF-7 seeding layer was first deposited on porous ${\alpha}-Al_2O_3$ substrate by in-situ low temperature crystallization, and then ZIF-7 membrane layer can be grown through the secondary high-temperature crystallization. Two synthesis solutions with different concentration were used to prepare ZIF-7 seeding layer and membrane layer on porous ${\alpha}-Al_2O_3$ substrate, respectively. As a result, a continuous and defect-free ZIF-7 membrane layer can be prepared on porous ${\alpha}-Al_2O_3$ substrate, as confirmed by scanning electron microscope. XRD characterization shows that the resulting membrane layer is composed of pure ZIF-7 phase without any impurity. A single gas permeation test of $H_2$, $O_2$, $CH_4$ or $CO_2$ was conducted based on our prepared ZIF-7 membrane. The ZIF-7 membrane exhibited excellent H2 molecular sieving properties due to its suitable pore aperture and defect-free membrane layer.
Keywords
ZIF-7 Membrane; Two-step Crystallization; Precursor Solution; Gas Permeation;
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