When tetrapropylammonium cations are removed from the α cavities of SAPO 37, but tetramethylammonium cations are still in the β-cages, a shift in the vibrational frequency of hydroxy groups to lower frequencies, with the corresponding appearance of stronger acid sites is observed; this is a consequence of the increase of the T–O–T′ angle dimensions owing to the presence of the bulky tetramethylammonium cations.
A. Corma, V. Fornes and J. Pérez-Pariente, J. Chem. Soc., Chem. Commun., 1993, 676 DOI: 10.1039/C39930000676
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