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Facile, room-temperature 17O enrichment of zeolite frameworks revealed by solid-state NMR spectroscopy

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Author(s)

Suzi May Pugh, Paul Anthony Wright, David Law, Nicholas Thompson, Sharon E. Ashbrook

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Abstract

A new approach for room-temperature 17O enrichment of zeolites reveals a surprisingly dynamic and labile framework, where rapid and reversible bond breaking takes place. 17O NMR spectroscopy shows that although O sites in both framework Si-O-Al and Si-O-Si linkages are enriched simply on exposure to H217O(l), the enrichment of Si-O-Al species is more rapid, with a more uniform framework enrichment observed at longer durations. We demonstrate that this unexpected enrichment can be observed for two different framework topologies and for Na-exchanged (i.e., non-acidic) zeolites, as well as their protonic forms, confirming that the Brønsted acid proton is not necessary for isotopic exchange into the framework. This work not only offers new opportunities for structural characterization of these chemically and industrially important materials using NMR spectroscopy, but suggests that further investigation of the rate and position of enrichment in zeolite frameworks could provide new insight into their chemical reactivity and their stability in aqueous-based applications such as ion exchange and catalysis.
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Original languageEnglish
Pages (from-to)900-906
Number of pages7
JournalJournal of the American Chemical Society
Volume142
Issue number2
Early online date25 Dec 2019
DOIs
Publication statusPublished - 15 Jan 2020

    Research areas

  • Zeolites, Solid-state MAS NMR spectroscopy, 17O enrichment, Room temperature lability

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