Method for preparing vapor-phase isomerization catalyst

Claim 1

A HYDROCARBON CONVERSION PROCESS FOR ISOMERIZING LIGHT HYDROCARBONS WHICH COMPRISES CONTACTING SAID HYDROCARBONS AT ISOMERIZATION CONDITIONS COMPRISING TEMPERATURES IN THE RANGE OF ABOUT 500 TO ABOUT 800*F., PRESSURES IN THE RANGE OF ABOUT ATMOSPHERIC AND ABOUT 500 P.S.I.G., AND BETWEEN ABOUT 500 TO 45,000 STANDARD CUBIC FEET OF HYDROGEN PER BARREL OF SAID HYDROCARBONS, WITH A CATALYST PREPARED BY IMPREGNATING SOLID HYDROUS ALUMINA CONTAINING BETWEEN ABOUT 1 TO 30 PERCENT BY WEIGHT OF COMBINED WATER IN THE PRESENCE OF BETWEEN ABOUT 0.001 TO 0.02 MOLE OF ALUMINUM CHLORIDE PER MOLE OF DRY AI2O3 WITH A SOLUTION OF A PLATINUM COMPOUND WHEREBY PLATINUM IS ADDED THERETO IN A PROPORTION BETWEEN ABOUT 0.01 AND 2.0 PERCENT BY WEIGHT, BASED ON DRY AI2O3, DRYING AND CALCINING, IMPREGNATING THE RESULTING COMPOSITE WITH HYDROGEN FLUORIDE TO A FLUORIDE LEVEL IN THE RANGE OF ABOUT 0.5 TO 5 PERCENT BY WEIGHT, BASED ON DRY AI2O3, EXPOSING THE COMPOSITE TO A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SULFUR, SULFUR-CONTAINING COMPOUNDS, AND MIXTURES THEREOF, IN SUFFICIENT QUANTITY WHEREBY SAID CONPOSITE IS CONTACTED WITH AT LEAST ABOUT 0.1 PERCENT BY WEIGHT OF SULFUR, BASED ON DRY AI203, AND CALCINING.