Active amorphous mixed oxides
AssigneeMobil Oil Corporation
InventorsClarence D. Chang, Cynthia T-W. Chu
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Abstract
A method for preparing an amorphous mixed oxide composition of enhanced catalytic activity is provided which involves extruding a mixture of silica with one or more other oxides, e.g. titania, gallia, alumina, etc., treating the extrudate with a basic aqueous alkali and/or alkaline earth solution and then treating the extrudate with an ammonium exchange solution.
Claims11
A method for manufacturing an amorphous mixed oxide containing silica and having an Alpha Value of greater than 1 which comprises steps of (1) extruding a mixture of amorphous silica and one or more amorphous oxides of elements selected from the group consisting of Periodic Table groups IIA, IIIA, VA, VIII, IIIB, IVB and VB, (2) treating the extrudate of step (1) with an aqueous alkali solution or alkaline earth solution of from about 0.2M to about 10M at a temperature of from about 40.degree. C. to reflux, (3) treating the product of step (2) with an aqueous ammonium exchange solution and (4) calcining the product of step (3).
A method for manufacturing an amorphous mixed oxide having an Alpa Value of greater than 1 which comprises steps of (1) extruding a mixture comprising from about 20 weight percent to about 80 weight percent amorphous silica and from about 80 weight percent to about 20 weight percent amorphous alumina, (2) treating the extrudate product of step (1) with an aqueous alkali solution comprising sodium, potassium or a mixture thereof of from about 0.2M to about 10M at a temperature of from about 40.degree. C. to reflux, (3) treating the product of step (2) with an aqueous ammonium exchange solution comprising an ammonium salt and (4) calcining the product of step (3) at a temperature of from about 200.degree. C. to about 600.degree. C. in an inert atmosphere.
Dependencies are inferred from the claim text.