Exploiting Dynamic Opening of Apertures in a Partially Fluorinated MOF for Enhancing H-2 Desorption Temperature and Isotope Separationopen access
- Authors
- Zhang, Linda; Jee, Seohyeon; Park, Jaewoo; Jung, Minji; Wallacher, Dirk; Franz, Alexandra; Lee, Wonjoo; Yoon, Minyoung; Choi, Kyungmin; Hirscher, Michael; Oh, Hyunchul
- Issue Date
- Nov-2019
- Publisher
- AMER CHEMICAL SOC
- Citation
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.141, no.50, pp 19850 - 19858
- Pages
- 9
- Journal Title
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
- Volume
- 141
- Number
- 50
- Start Page
- 19850
- End Page
- 19858
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/2694
- DOI
- 10.1021/jacs.9b10268
- ISSN
- 0002-7863
1520-5126
- Abstract
- Deuterium has been recognized as an irreplaceable element in industrial and scientific research. However, hydrogen isotope separation still remains a huge challenge due to the identical physicochemical properties of the isotopes. In this paper, a partially fluorinated metal-organic framework (MOF) with copper, a so-called FMOFCu, was investigated to determine the separation efficiency and capacity of the framework for deuterium extraction from a hydrogen isotope mixture. The unique structure of this porous material consists of a trimodal pore system with large tubular cavities connected through a smaller cavity with bottleneck apertures with a size of 3.6 angstrom plus a third hidden cavity connected by an even smaller aperture of 2.5 angstrom. Depending on the temperature, these two apertures show a gate-opening effect and the cavities get successively accessible for hydrogen with increasing temperature. Thermal desorption spectroscopy (TDS) measurements indicate that the locally flexible MOF can separate D-2 from anisotope mixture efficiently, with a selectivity of 14 at 25 K and 4 at 77 K.
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