The method of the high-temperature adsorption of NH3 was used for the first time to study the acidity of a number of reduced impregnated aluminum-chromium (AC) catalysts as a function of the nature of the starting Al2O3, the amount of Cr2O3, and the alkaline promoter.
The total acidity of the AC catalysts is higher than the acidity of the starting Al2O3, and it increases slightly when the amount of Cr2O3 is increased from 6.1 to 26%, and decreases when an alkaline promoter (K2O, Li2O) is inserted.
The nonuniformity of the acid surface of AC catalysts depends on the amount of Cr2O3, the nature of the starting Al2O3, the nature of the starting Al2O3, and the alkaline additive.
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Sterligov, O.D., Ponomareva, S.A. & Medvedev, V.N. Acidity of reduced aluminum-chromium catalysts. Russ Chem Bull 22, 1284–1286 (1973). https://doi.org/10.1007/BF00928607
- Total Acidity
- Acid Surface