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The characterization of Si–Al ordering in A-type zeolite (ZK4) by 29Si NMR

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Abstract

The study of the 29Si NMR spectra of two A-type zeolites (ZK4) with Si/Al ratios of 1.18 and 1.40 shows that the Si, Al distribution obeys Loewenstein's rule. The NMR absorption observed at −89.1 p.p.m. for both compositions is assigned to Si(4Al). This result suggests that the single peak observed for NaA (Si/Al = 1) should also be assigned to Si(4Al) and not Si(3Al) as recently proposed1–4.

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Authors and Affiliations

  1. Exxon Research and Engineering Company, PO Box 121, Linden, New Jersey, 07036, USA

    Michael T. Melchior, David E. W. Vaughan, Richard H. Jarman & Allan J. Jacobson

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  1. Michael T. Melchior
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  2. David E. W. Vaughan
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  3. Richard H. Jarman
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  4. Allan J. Jacobson
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Melchior, M., Vaughan, D., Jarman, R. et al. The characterization of Si–Al ordering in A-type zeolite (ZK4) by 29Si NMR. Nature 298, 455–456 (1982). https://doi.org/10.1038/298455a0

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