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Unexpected Molecular Sieving Properties of Zeolitic Imidazolate Framework-8
Abstract
We studied molecular sieving properties of zeolitic imidazolate framework-8 (ZIF-8) by estimating the thermodynamically corrected diffusivities of probe molecules at 35 °C. From helium (2.6 Å) to iso-C4H10 (5.0 Å), the corrected diffusivity drops 14 orders of magnitude. Our results further suggest that the effective aperture size of ZIF-8 for molecular sieving is in the range of 4.0 to 4.2 Å, which is significantly larger than the XRD-derived value (3.4 Å) and between the well-known aperture size of zeolite 4A (3.8 Å) and 5A (4.3 Å). Interestingly, because of aperture flexibility, the studied C4 hydrocarbon molecules that are larger than this effective aperture size still adsorb in the micropores of ZIF-8 with kinetic selectivities for iso-C4H8/iso-C4H10 of 180 and n-C4H10/iso-C4H10 of 2.5 × 10(6). These unexpected molecular sieving properties open up new opportunities for ZIF materials for separations that cannot be economically achieved by traditional microporous adsorbents such as synthetic zeolites.
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Cites
Adsorbents: Fundamentals and Applications
Yang, R. T. (2003) · doi:10.1002/047144409x · Cited by 1,182
Cited by
Yang, L., Qian, S., Wang, X., Cui, X., Chen, B., & Xing, H. (2020) · Chemical Society Reviews · doi:10.1039/c9cs00756c · Cited by 746
Control of zeolite framework flexibility and pore topology for separation of ethane and ethylene
Bereciartua, P. J., Cantín, Á., Corma, A., Jordá, J. L., Palomino, M., Rey, F., Valencia, S., Corcoran, E. W., Kortunov, P., Ravikovitch, P. I., et al. (2017) · Science · doi:10.1126/science.aao0092 · Cited by 460
Wang, Y., Peh, S. B., & Zhao, D. (2019) · Small · doi:10.1002/smll.201900058 · Cited by 342
Formation of Ultrathin, Continuous Metal–Organic Framework Membranes on Flexible Polymer Substrates
Hou, J., Sutrisna, P. D., Zhang, Y., & Chen, V. (2016) · Angewandte Chemie International Edition · doi:10.1002/anie.201511340 · Cited by 258
Metadata
- Authors
- Zhang, C., Lively, R. P., Zhang, K., Johnson, J. R., Karvan, O., & Koros, W. J.
- Venue
- The Journal of Physical Chemistry Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-07-30
- Volume
- 3
- Issue
- 16
- Pages
- 2130-2134
- ISSN
- 1948-7185 (ISSN-L)
- OpenAlex
- W2325528214
- Cited by
- 684
- References
- 1
- FWCI
- 17.83
- Type
- journal article
- Language
- en
- Open access
- closed
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