Abstract
1. The effect of the platinum concentration in the range from 0.05 to 1.0% on platinum particle size was studied in the case of alumina-platinum catalysts containing 1% lithium and not containing lithium. The dehydrogenation of n-dodecane at 480‡C under hydrogen pressure was also studied. 2. Platinum particle size increases with increasing platinum concentration in all the catalysts. 3. The catalyst selectivity relative to monoolefin formation at different conversions is independent of the platinum concentration and depends only on the addition of lithium. 4. Catalysts containing from 0.25 to 1.0% platinum have the same specific activity in the dehydrogenation of n-dodecane. The specific activity of catalysts with 0.05% Pt is higher than for catalysts with higher platinum contents, independently of the method of preparation and addition of lithium.
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