Process for preparing alumina catalyst compositions

Claim 2

A PROCESS FOR THE PREPARATION OF AN ALUMINA HYDRATE COMPOSITION OF ALUMINA TRIHYDRATE WHICH COMPRISES MIXING AN AQUEOUS SOLUTION OF A SALT OF ALUMINUM WITH AQUEOUS AMMONIUM HYDROXIDE WHILE CONTROLLING THE RELATIVE AMOUNTS OF SAID SALT OF ALUMINUM AND SAID AMMONIUM HYDROXIDE TO EFFECT A PH OF THE MIXED SOLUTION FROM 7 TO ABOUT 9.5 DURING PRECIPITATION OF SUBSTANTIALLY THE ENTIRE ALUMINA HYDRATE AND WHILE CONTROLLING THE TEMPERATURE FROM ABOUT 70* TO ABOUT 160*F., SEPARATING PRECIPITATED ALUMINA HYDRATE FROM THE RESULTING SOLUTION, WASHING THE ALUMINA HYDRATE WITH WATER TO REMOVE CONTAMINATING WATER-SOLUBLE IONS WHILE MAINTAIING A PH OF AT LEAST ABOUT 7 AND CONVERTING THE WASHED HYDRATE COMPOSITION TO AN ALUMINA HYDRATE CONTAINING ABOUT 65 TO ABOUT 95% OF ALUMINA TRIHYDRATE.

Claim 3

IN THE PRODUCTION OF AN ALUMINA BASE-PLATINUM METAL CATALYST BY FORMATION OF AN ALUMINA HYDROGEL, CONVERTING THE HYDROGEL TO A HYDRATE COMPOSITION PREDOMINATING IN ALUMINA TRIHYDRATE, INCORPORATING A PLATINUM METAL IN THE HYDRATE COMPOSITION IN FINELY DISTRIBUTED FORM, DRYING AND CALCINING THE RESULTING CATALYST, A PROCESS FOR PREPARATION OF THE ALUMINA HYDRATE COMPOSITION WHICH COMPRISES MIXING AN AQUEOUS SOLUTION OF A SALT OF ALUMINUM WITH AQUEOUS AMMONIUM HYDROXIDE WHILE CONTROLLING THE RELATIVE AMOUNTS OF SAID SALT OF ALUMINUM AND SAID AMMONIUM HYDROXIDE TO EFFECT A PH OF THE MIXED SOLUTION FROM 7 TO ABOUT 9.5 DURING PRECIPITATION OF SUBSTANTIALLY THE ENTIRE ALUMINA HYDRATE AND WHILE CONTROLLING THE TEMPERATURE FROM ABOUT 70* TO ABOUT 160*F., SEPARATING PRECIPITATED ALUMINA HYDRATED FROM THE RESULTING SOLUTION, WASHING THE ALUMINA HYDRATE WITH WATER TO REMOVE CONTAMINATING WATER-SOLUBLE IONS WHILE MAINTAINING A PH OF AT LEAST ABOUT 7, AND CONVERTING THE WASHED HYDRATE COMPOSITION TO A MIXTURE CONTAINING FROM ABOUT 65 TO ABOUT 95 PERCENT ALUMINA TRIHYDRATE PHASE.

Claim 4

IN THE PRODUCTION OF AN ALUMINA BASE-PLATINUM METAL CATALYST BY FORMATION OF AN ALUMINA HYDROGEL, CONVERTING THE HYDROGEL TO A HYDRATE COMPOSITION PREDOMINATING IN ALUMINA TRIHYDRATE, INCORPORATING A PLATINUM METAL IN THE HYDRATE COMPOSITION IN FINELY DISTRIBUTED FORM, DRYING AND CALCINING THE RESULTING CATALYST, A PROCESS FOR PREPARATION OF THE ALUMINA HYDRATE COMPOSITION WHICH COMPRISES MIXING AN AQUEOUS SOLUTION OF A SALT OF ALUMINUM WITH AQUEOUS AMMONIUM HYDROXIDE WHILE CONTROLLING THE RELATIVE AMOUNTS OF SAID SALT OF ALUMINUM AND SAID AMMONIUM HYDROXIDE TO EFFECT A PH OF THE MIXED SOLUTION FROM 7 TO ABOUT 9.5 DURING PRECIPITATION OF SUBSTANTIALLY THE ENTIRE ALUMINA HYDRATE AND WHILE CONTROLLING THE TEMPERATURE FROM ABOUT 70* TO ABOUT 160*F., SEPARATING PRECIPITATED ALUMINA HYDRATED FROM THE RESULTING SOLUTION, WASHING THE ALUMINA HYDRATE WITH WATER TO REMOVE CONTAMINATING WATER-SOLUBLE IONS WHILE MAINTAINING A PH OF AT LEAST ABOUT 7, AND CONVERTING THE WASHED HYDRATE COMPOSITION TO A MIXTURE CONTAINING FROM ABOUT 65 TO ABOUT 95 PERCENT ALUMINA TRIHYDRATE PHASE.