Catalytic conversion with high density catalyst

Claim 1

A METHOD FOR PREPARING AN ATTRITION RESISTANT CATALYST CONSISTING ESSENTIALLY OF SILICA AND ALUMINA, HIGHLY STABLE TO DEACTIVATION BY STEAM, CHARACTERIZED BY A HIGH DIFFUSIVITY AND AN APPARENT DENSITY OF AT LEAST 0.9 GRAM PER CUBIC CENTIMETER WHICH COMPRISES DISPERSING IN A SILICAALUMINA SOL CONTAINING, ON A DRY BASIS, A MAJOR PROPORTION OF SILICA AND A MINOR PROPORTION OF BETWEEN ABOUT 10 AND ABOUT 15 PERCENT BY WEIGHT OF ALUMINA, AN AMOUNT CORRESPONDING TO BETWEEN ABOUT 30 AND ABOUT 45 PERCENT BY WEIGHT OF THE RESULTING DRY COMPOSITE OF FINELY DIVIDED ALPHA ALUMINA WHICH HAS UNDERGONE PREVIOUS CALCINATION AT A TEMPERATURE IN EXCESS OF 2000*F. AND WHICH HAS A WEIGHT MEAN PARTICLE DIAMETER OF BETWEEN ABOUT 2 AND ABOUT 7 MICRONS, THE CONCENTRATIONS AND PROPORTIONS OF REACTANTS BEING SUCH THAT THE RESULTING SILICA-ALUMINA SOL HAVING THE FINELY DIVIDED CALCINED ALPHA ALUMINA DISPERSED THEREIN HAS A PH OF BETWEEN 8.5 AND 9 AND A PRODUCT CONCENTRATION OF BETWEEN 10 AND 15, PERMITTING THE RESULTING SOL TO SET TO A HYDROGEL, HYDROTHERMALLY TREATING THE RESULTING HYDROGEL AT A TEMPERATURE OF BETWEEN 80*F. AND 200*F. FOR 6 TO 24 HOURS, WASHING THE HYDROGEL FREE OF WATER SOLUBLE MATTER, DRYING AND CALCINING.

Claim 2

A METHOD FOR PREPARING AN ATTRITION RESISTANT CATALYST CONSISTING ESSENTIALLY OF SILICA AND ALUMINA, HIGHLY STABLE TO DEACTIVATION BY STEAM, CHARACTERIZED BY A HIGH DIFFUSIVITY AND AN APPARENT DENSITY OF AT LEAST 0.9 GRAM PER CUBIC CENTIMETER WHICH COMPRISES DISPERSING IN A SILICAALUMINA SOL CONTAINING, ON A DRY BASIS, A MAJOR PROPORTION OF SILICA AND A MINOR PROPORTION OF BETWEEN ABOUT 10 AND ABOUT 15 PERCENT BY WEIGHT OF ALUMINA, AN AMOUNT CORRESPONDING TO BETWEEN ABOUT 30 AND ABOUT 45 PERCENT BY WEIGHT OF THE RESULTING DRY COMPOSITE OF FINELY DIVIDED ALPHA ALUMINA WHICH HAS UNDERGONE PREVIOUS CALCINATION AT A TEMPERATURE IN EXCESS OF 2000*F. AND WHICH HAS A WEIGHT MEAN PARTICLE DIAMETER OF BETWEEN ABOUT 2 AND ABOUT 7 MICRONS, THE CONCENTRATIONS AND PROPORTIONS OF REACTANTS BEING SUCH THAT THE RESULTING SILICA-ALUMINA SOL HAVING THE FINELY DIVIDED CALCINED ALPHA ALUMINA DISPERSED THEREIN HAS A PH OF BETWEEN 8.5 AND 9 AND A PRODUCT CONCENTRATION OF BETWEEN 10 AND 15, PERMITTING THE RESULTING SOL TO SET TO A HYDROGEL, HYDROTHERMALLY TREATING THE RESULTING HYDROGEL AT A TEMPERATURE OF BETWEEN 80*F. AND 200*F. FOR 6 TO 24 HOURS, WASHING THE HYDROGEL FREE OF WATER SOLUBLE MATTER, DRYING AND CALCINING.