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AssigneeMobil Oil Corporation
InventorsWilliam E. Garwood, Nai Yeun Chen, Stanley J. Lucki
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A method of removing alumina from a crystalline aluminosilicate composition having a silica/alumina mole ratio of from above 3 to about 12 which comprises heating said aluminosilicate composition to a temperature of greater than 50.degree.C. to about 100.degree.C. in the presence of a cationic form of chromium, preferably Cr.sup.+.sup.3, in aqueous solution of above 0.01 Normal of a chromium salt of a mineral acid whereby the pH is less than 3.5, and such that the atomic ratio of chromium to aluminum is greater than 0.5 for a time sufficient to remove the alumina. The method of this invention permits the aluminosilicate composition to retain substantial crystallinity. Organic compound conversion with the dealuminized material formed by the method of this invention may be advantageously utilized.
A method of removing alumina from a crystalline aluminosilicate having a silica/alumina mole ratio of from above 3 to about 12 which comprises heating said aluminosilicate to a temperature of greater than 50.degree.C to about 100.degree.C in the presence of positive trivalent chromium ions in aqueous solution of above 0.01 Normal of a chromium salt of a mineral acid whereby the pH is less than 3.5 such that the atomic ratio of chromium in the solution to aluminum in the aluminosilicate is greater than 0.5 for a time sufficient to remove alumina.
Dependencies are inferred from the claim text.