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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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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DOI: https://doi.org/10.1038/298455a0
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