Heteroepitaxially-grown Zeolitic Imidazolate Framework Membranes with Unprecedented Propylene/Propane Separation Performances
- Heteroepitaxially-grown Zeolitic Imidazolate Framework Membranes with Unprecedented Propylene/Propane Separation Performances
- 권혁택; 정해권; 알버트 이성수; 안희성; 이종석
- Heteroepitaxially Grown; ZIF-8; ZIF-67; Propylene/propane; separation
- Issue Date
- Journal of the American Chemical Society
- VOL 137, NO 38, 12304-12311
- Propylene/propane separation is one of the most challenging separations, currently achieved by energyintensive cryogenic distillation. Despite the great potential for energy-efficient membrane-based separations, no commercial membranes are currently available due to the limitations of current polymeric materials. Zeolitic imidazolate framework, ZIF-8, with the effective aperture size of ∼4.0 Å, has been shown to be very promising for propylene/propane separation. Despite the extensive research on ZIF-8 membranes, only a few reported ZIF-8 membranes have displayed good propylene/propane separation performances presumably due to the challenges of controlling the microstructures of polycrystalline membranes. Here we report the first wellintergrown membranes of ZIF-67 (Co-substituted ZIF-8) by heteroepitaxially growing ZIF-67 on ZIF-8 seed layers. The ZIF-67 membranes exhibited impressively high propylene/propane separation capabilities. Furthermore, when a tertiary growth of ZIF-8 layers was applied to heteroepitaxially grown ZIF-67 membranes, the membranes exhibited unprecedentedly high propylene/propane separation factors of ∼200 possibly due to enhanced grain boundary structure.
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