Kwon, Hyuk Taek Jeong, Hae-Kwon Lee, Albert S. An, He Seong Lee, Jong Suk 2024-01-20T06:03:24Z 2024-01-20T06:03:24Z 2022-01-10 2015-09-30 0002-7863 https://pubs.kist.re.kr/handle/201004/124994 Propylene/propane separation is one of the most challenging separations, currently achieved by energy-intensive 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 similar to 4.0 angstrom, 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 well-intergrown 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 similar to 200 possibly due to enhanced grain boundary structure. English AMER CHEMICAL SOC METAL-ORGANIC FRAMEWORK MOLECULAR-SIEVE MEMBRANE IN-SITU SYNTHESIS ZIF-8 MEMBRANES EXTERNAL SURFACE GAS-TRANSPORT THIN-FILMS OXIDATION CARBON SELECTIVITY Heteroepitaxially Grown Zeolitic Imidazolate Framework Membranes with Unprecedented Propylene/Propane Separation Performances Article 10.1021/jacs.5b06730 1 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.137, no.38, pp.12304 - 12311 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 137 38 12304 12311 scie scopus 000362243300025 2-s2.0-84942929308 Chemistry, Multidisciplinary Chemistry Article METAL-ORGANIC FRAMEWORK MOLECULAR-SIEVE MEMBRANE IN-SITU SYNTHESIS ZIF-8 MEMBRANES EXTERNAL SURFACE GAS-TRANSPORT THIN-FILMS OXIDATION CARBON SELECTIVITY Heteroepitaxially Grown ZIF-8 ZIF-67 Propylene/propane separation