On hydration template-free SAPO-34 shows the opening of some Si–O–Al bonds as suggested by 29Si MAS NMR and XRD results, the effect being reversible upon dehydration; the hydrated distorted structure is stable for months with no further modifications and the ordered material can be regenerated by removal of water at 423 K.
R. Vomscheid, M. Briend, M. J. Peltre, P. Massiani, P. P. Man and D. Barthomeuf, J. Chem. Soc., Chem. Commun., 1993, 544 DOI: 10.1039/C39930000544
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