Conclusions
Depending on the heat treatment conditions, a parallelism was detected between the change in the amount of Cr2+ and the change in the yield of toluene from n-heptane on a reduced aluminum-chromium-potassium catalyst. One of the possible reasons for the heat deactivation of reduced aluminum-chromium-potassium catalysts is a decrease in the number of Cr2+ ions on their surface.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1644–1646, July, 1973.
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Slovetskaya, K.I., Gitis, K.M. & Rozengart, M.I. Deactivation of reduced aluminum-chromium catalysts during heat treatments. Russ Chem Bull 22, 1591–1593 (1973). https://doi.org/10.1007/BF00930070
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DOI: https://doi.org/10.1007/BF00930070