Upon hydration template-free SAPO-40 shows the opening of certain Si—O—Al and P—O—Al bonds; although 27Al, 31P MAS NMR and powder X-ray diffraction (XRD) suggest that this effect is completely reversible on dehydration, 29Si MAS NMR indicates that the local silicon environments are not fully restored.
J. P. Lourenço, M. F. Ribeiro, F. R. Ribeiro, J. Rocha and Z. Gabelica, J. Chem. Soc., Faraday Trans., 1995, 91, 2213 DOI: 10.1039/FT9959102213
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