期刊
JOURNAL OF MEMBRANE SCIENCE
卷 529, 期 -, 页码 105-113出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2016.12.068
关键词
Zeolitic-imidazolate frameworks; Gas separation; Membranes; Defects; Long-term stability
资金
- National Science Foundation [CBET-1510530, 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]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1510530] Funding Source: National Science Foundation
Membranes of ZIF-8, a prototypical zeolitic-imidazolate framework (ZIF) with a sodalite topology, have shown excellent propylene/propane separation performances based on molecular sieving mechanism. Although the long-term stability of ZIF-8 membranes is of critical importance for their practical applications, there are only a few studies reported on the subject. Here, we report the long-term binary propylene/propane performances of ZIF-8 membranes prepared by two distinctive synthesis methods. A series of characterizations was employed to explain how different synthetic protocols led to the formation of ZIF-8 membranes with different bulk defect densities and surface defects, thereby affecting the long-term membrane stability. Finally, a post-synthetic ligand treatment is proposed as an effective means to mitigate the defects of ZIF-8 membranes, resulting in improved long-term separation performances.
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