Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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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)
  • Received : 2013.12.19
  • Accepted : 2014.02.20
  • Published : 2014.06.01
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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

References

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