Oxidative dehydrogenation using gel precipitated catalyst preparation
AssigneePetro-Tex Chemical Corporation
InventorEdward J. Miklas
Life of this patent
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Abstract
Improved zinc ferrite oxidative dehydrogenation catalyst can be prepared by co-precipitating the catalysts from a solution of zinc and iron ions in the presence of a high molecular weight polyhydric material such as dextran in a 2 to 4 normal alkali metal hydroxide solution. The result of having the polyhydric material present is that the precipitate has the form of a granular gelatinous precipitate of improved processability. The catalyst itself is more active in dehydrogenations and physically stronger than comparable catalyst prepared by conventional methods. More importantly, zinc ferrite catalysts prepared in this manner have extremely long useful lives whereas those prepared by conventional methods have very short useful lives.
Claims18
In a process for the oxidative dehydrogenation of organic compounds having at least two adjacent, hydrogen containing carbon atoms in the presence of a catalyst wherein the improvement comprises utilizing a zinc ferrite catalyst prepared by the steps of (a) contacting a solution of a soluble metal component comprising zinc and iron with a precipitating agent to precipitate an insoluble metal component comprising zinc and iron, said solution containing in addition to the soluble metal component from 0.1 to 11 weight percent of a soluble polyhydric organic compound based on the weight of metal and (b) calcining the precipitate to form said zinc ferrite oxidative dehydrogenation catalyst, wherein the precipitating agent is a solution of a hydroxide of a metal selected from the group consisting of Li, Na, K, Rb, and Cs, said precipitating solution having a normality of between 2 and 4 and said polyhydric compound contains at least 2 hydroxyl groups and is selected from the group consisting of organic alcohols, polyesters, polyethers, polysaccharides and mixtures thereof having a molecular weight of at least about 3,000.
Dependencies are inferred from the claim text.