Conclusions
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1.
Thermochemical treatment of Y and ZSM zeolites with silicon tetrachloride vapor leads to the loss, first, of aluminum atoms from cation positions and, second, of aluminum atoms from the silicic acid framework of the zeolite.
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2.
Active centers which have aluminum atoms in cation positions in their composition lead, to a considerable extent, to hydrogen transfer reactions in the intermediate, unsaturated hydrocarbons.
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3.
The stability of the catalytic activity of zeolites depends on the number of aluminum atoms in cation positions. As the number of such atoms increases, the stability is reduced.
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4.
Nonuniform distribution of aluminum atoms along the zeolite crystal increases the probability of the formation of fragments of the type [(SiO)4−nSi(OAl)n]n−-Al3+ or [(SiO)4−nSi(OAl)n]n−Al3+(OH−...H+), which can act as centers for multipoint interaction with molecules of the reactants.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 1002–1006, May, 1986.
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Stepanov, V.G., Echevskii, G.V., Shubin, A.A. et al. Factors affecting the stability and selectivity of zeolites in the conversion of methanol to hydrocarbons. Communication 2. Effect of dealuminization. Russ Chem Bull 35, 909–913 (1986). https://doi.org/10.1007/BF00955347
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DOI: https://doi.org/10.1007/BF00955347