Abstract
1. Mineralizing oxides (MoO3 and V2O5) and stabilizing oxides (NiO and Cr2O3) have been investigated in relation to their influence on the stability of structural-mechanical properties of aluminum oxide catalysts during prolonged heat treatment. 2. It has been established that all of the alumina-molybdenum catalysts (MoO3 contents from 4 to 20%) remain stable during treatment at 600°C. For the catalysts containing up to 5% MoO3, there is no change in structural-mechanical properties when treated at 700 or 800°C. With MoO3 contents above 5% and a treating temperature of 700°C or higher, the heat stability of the catalyst is governed by the mutual influence of temperature and the quantity of the active oxide in the specimen. 3. In the example of nickel and chromium oxides, it has been shown that these different stabilizers retard the phase-conversion process of the active aluminum oxide in different stages.
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