Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 137, Issue 38, Pages 12304-12311Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b06730
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Funding
- National Science Foundation [CBET-1132157, DBI-0116835]
- Qatar National Research Fund [NPRP 7-042-2-021]
- R&D Convergence Program of MSIP (Ministry of Science, ICT and Future Planning)
- NST (National Research Council of Science & Technology) of the Republic of Korea [CRC-14-1-KRICT]
- VP for Research Office
- Texas A&M Engineering Experimental Station
- National Research Council of Science & Technology (NST), Republic of Korea [융합연구단 14-1-KRICT] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1132157] Funding Source: National Science Foundation
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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.
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