Abstract
1. A study has been made of the influence of composition and calcination temperature of alumina-chromium catalysts on their specific activity in the dehydrogenation and dehydration of absolute isopropanol. It has been shown that the specific activity in dehydration passes through a minimum, strongly extended for the catalysts calcined at 450° and localized in the region of 15–25 mole % Cr2O3 for the series of catalysts calcined at 600°. The specific activity in dehydrogenation increases evenly with an increase in the catalysts' chromic oxide content. The behavior of the catalysts is explained on the basis of data relating to their phase composition. 2. Alumina-chromium catalysts at 245–320° are preferentially dehydration catalysts. 3. For certai n instances of the preparation of catalysts with identical Cr2O3 content but with differing pH of precipitation there has been demonstrated a competition of a concentration factor with the conditions of precipitation in the formation of the texture of the catalysts: With predominance of the influence of the first factor (mutual protection against crystallization) more thermostable catalysts are obtained.
Published Version
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