Conclusions
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1.
New structural hydroxyl groups are not formed during the elimination of small amounts of Al from type Y zeolites.
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2.
Extensive elimination of aluminum from such zeolites leads to a marked increase of the concentration of weakly acidic hydroxyl groups.
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3.
The Y-type zeolite framework is partially retained in x-ray amorphous samples with 104 SiO2/Al2O3 ratio.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2670–2676, December, 1977.
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Nabiev, B.A., Mishin, I.V., Danyushevskii, V.Y. et al. IR spectroscopic, thermogravimetric, x-ray, and adsorptional studies of dealuminized Y zeolites. Russ Chem Bull 26, 2468–2473 (1977). https://doi.org/10.1007/BF00924546
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DOI: https://doi.org/10.1007/BF00924546