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In relation to this article, we declare that there is no conflict of interest.
Publication history
Received February 20, 2023
Revised March 27, 2023
Accepted March 31, 2023
Acknowledgements
The authors acknowledge the support by NRF Korea (2021R1 F1A1047221) funded by the Ministry of Science and ICT, Korea. The synchrotron PXRD experiments were carried out at Beamline 2D of the Pohang Accelerator Laboratory (PAL).
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Fluoride-incorporated ionic clathrate hydrates

1Department of Hydrogen & Renewable Energy, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Korea 2Korea Atomic Energy Research Institute, 111 Daedeok-daero 989, Yuseong-gu, Daejeon 34057, Korea 3Department of Applied Chemistry, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Korea
kyuchul.shin@knu.ac.kr
Korean Journal of Chemical Engineering, October 2023, 40(10), 2520-2528(9), 10.1007/s11814-023-1462-7
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Abstract

Ionic clathrate hydrates are promising materials for hydrate-based gas storage and separation processes. Here, we demonstrated that the hydroxide ion in the cubic structure-II (CS-II) and hexagonal structure-III (HS-III) ionic clathrate hydrates can be replaced by fluoride. Me4N+ and Et2Me2N+ cations were selected as guest species for the CS-II and HS-III hydrates, respectively. The crystal structure of each hydrate was identified through Rietveld analysis of the PXRD pattern. The Fd3m structure (CS-II) of Me4NF+N2 or O2 hydrates and the P6/mmm structure (HS-III) of Et2Me2NF+CH4 hydrate were confirmed. We also investigated the phase equilibria of hydroxide or fluoride-incorporated CS-II and HS-III hydrate systems, and found that incorporating fluoride destabilizes the hydrate lattice to a greater extent than hydroxide. The present findings will provide better understanding of the guest-host interactions in ionic clathrate hydrates, and suggest their potential for practical applications in gas storage and separation technologies.

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