Conclusions
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1.
In the dehydrocyclization of n-heptane on aluminum-chromium catalysts a gradual decrease in the yields of toluene and, to a less degree, in the yields of the other transformation products of n-heptane, is observed with increase in the temperature of their reduction. An increase in the regeneration temperature of the same catalyst samples, previously deactivated by reduction at 700°, leads to a gradual increase in the yields of the reaction products.
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2.
The found experimental facts can be explained by the changes in the surface of the Cr2O3 in the aluminum-chromium catalysts during their heat treatments, and also by the consecutive character of the dehydrocyclization reaction.
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Literature cited
L. A. Novikova, M. I. Rozengart, N. F. Kononov, N. G. Ivanova, T. V. Zueva, and B. A. Kazanskii, Neftekhimiya,6, 531 (1966).
M. I. Rozengart, K. M. Gitis, V. P. Saltanova, S. A. Anurov, Z. A. Rashchupkina, and B. A. Kazanskii, Kinetika i Kataliz,11, 1446 (1970).
M. I. Rozengart and B. A. Kazanskii, Usp. Khim.,40, 1537 (1971).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1648–1650, July, 1973.
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Gitis, K.M., Rozengart, M.I. Effect of reduction and regeneration temperatures of aluminum-chromium and aluminum-chromium-potassium catalysts on the composition of n-heptane dehydrocyclization products. Russ Chem Bull 22, 1597–1599 (1973). https://doi.org/10.1007/BF00930072
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DOI: https://doi.org/10.1007/BF00930072