Conclusions
-
1.
The total concentrations of hydrogen (in the form of H2O, OH, and H3O+) in CaX and CaY zeolites, evacuated at 10−4 torr and 300, 400, or 500°, were determined by the method of isotopic exchange with D2.
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2.
There is a threshold degree of exchange of Na+ for Ca2+, after which a rapid increase in the content of protium and the catalytic activity of zeolites in reactions of the carbonium ion type is observed.
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3.
The mobility of H, as well as its thermal stability, increase with increasing Ca2+ content and mole ratio SiO2/Al2O3 in zeolites of the faujasite type.
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4.
For calcium zeolites prepared from NaY, produced by hydrothermal synthesis and dealumination, the content and mobility of protium are close, which indicates identity of samples prepared by different methods.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2689–2696, December, 1973.
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Minachev, K.M., Dmitriev, R.V., Isakov, Y.I. et al. Exchange of deuterium with the hydrogen of the surface of zeolite catalysts. Russ Chem Bull 22, 2625–2630 (1973). https://doi.org/10.1007/BF00926124
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DOI: https://doi.org/10.1007/BF00926124