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  Chemical Affinity of Ag-Exchanged Zeolites for Efficient Hydrogen Isotope Separation

Zhang, L., Wulf, T., Baum, F., Schmidt, W., Heine, T., & Hirscher, M. (2022). Chemical Affinity of Ag-Exchanged Zeolites for Efficient Hydrogen Isotope Separation. Inorganic Chemistry, 61(25), 9413-9420. doi:10.1021/acs.inorgchem.2c00028.

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 Creators:
Zhang, Linda1, Author
Wulf, Toshiki2, 3, Author
Baum, Florian4, Author           
Schmidt, Wolfgang4, Author           
Heine, Thomas3, 5, Author
Hirscher, Michael1, Author
Affiliations:
1Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569 Stuttgart, Germany, ou_persistent22              
2Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Linnéstraße 2, 04103 Leipzig, Germany, ou_persistent22              
3Helmholtz-Zentrum Dresden-Rossendorf, Forschungsstelle Leipzig, Permoserstraße 15, 04318 Leipzig, Germany, ou_persistent22              
4Research Group Schmidt, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445618              
5Fakultät für Chemie und Lebensmittelchemie, TU Dresden, Bergstraße 66c, 01062 Dresden, Germany, ou_persistent22              

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 Abstract: We report an ion-exchanged zeolite as an excellent candidate for large-scale application in hydrogen isotope separation. Ag(I)-exchanged zeolite Y has been synthesized through a standard ion-exchange procedure. The D2/H2 separation performance has been systematically investigated via thermal desorption spectroscopy (TDS). Undercoordinated Ag+ in zeolite AgY acts as a strong adsorption site and adorbs preferentially the heavier isotopologue even above liquid nitrogen temperature. The highest D2/H2 selectivity of 10 is found at an exposure temperature of 90 K. Furthermore, the high Al content of the zeolite structure leads to a high density of Ag sites, resulting in a high gas uptake. In the framework, approximately one-third of the total physisorbed hydrogen isotopes are adsorbed on the Ag sites, corresponding to 3 mmol/g. A density functional theory (DFT) calculation reveals that the isotopologue-selective adsorption of hydrogen at Ag sites contributes to the outstanding hydrogen isotope separation, which has been directly observed through cryogenic thermal desorption spectroscopy. The overall performance of zeolite AgY, showing good selectivity combined with high gas uptake, is very promising for future technical applications.

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Language(s): eng - English
 Dates: 2022-01-042022-06-142022-06-27
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.inorgchem.2c00028
 Degree: -

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Title: Inorganic Chemistry
  Abbreviation : Inorg. Chem.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 61 (25) Sequence Number: - Start / End Page: 9413 - 9420 Identifier: ISSN: 0020-1669
CoNE: https://pure.mpg.de/cone/journals/resource/0020-1669