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²³Na NMR spectra of Na-K form low silica X zeolite loaded with potassium for saturating level, which corresponds to 9.0 atoms per unit, have been observed. Other than a centered grain of the spectral component, another separated peak component with shift of somewhat larger than bulk Na has been detected. Such the extra peak component shows complex hysteresis on temperature and is accompanied with quite slow dynamics of days-order. It is attributed to atomic re-configurations among sites occurs in the course of melting and re-crystallization process among alloy of sodium and potassium, which possibly is formed on surface or outside of the zeolite crystals.

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  This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1007/s10751-024-02040-7

Keyword: Zeolite, NMR, Knight shift, Sodium-potassium alloy, 23Na

Date published: 2024-08-06

Publisher: Springer Science and Business Media LLC

Journal:

• Interactions (ISSN: 30050731) vol. 245 196

Funding:

• JSPS KAKENHI JP15540353
• MEXT KAKENHI G JP19051009

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4786

First published URL: https://doi.org/10.1007/s10751-024-02040-7

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Updated at: 2025-08-06 08:30:33 +0900

Published on MDR: 2025-08-06 08:19:51 +0900