Reactivation of supported platinum catalysts

Claim 1

A METHOD FOR THE REGENERATION AND REACTIVATION OF A SUPPORTED PLATINUM CATALYST DEACTIVATED BY THE ACCUMULATION OF CARBONACEOUS DEPOSITS THEREON AS WELL AS BY THE AGGLOMERATION OF THE PLATINUM INTO LARGE CRYSTALLITES OF LOW ACTIVITY WHICH COMPRISES REMOVIANG AT LEAST A PORTION OF THE CARBONACEOUS DEPOSITS BY CONTROLLED BURNING AT A TEMPERATURE BELOW ABOUT 1050*F., CONTACTING THE CATALYST AT A TEMPERATURE IN THE RANGE FROM ABOUT 700* TO 1050* F. WITH A GASEOUS MIXTURE CONTAINING OXYGEN, STEAM AND CHLORINE, THE MOLAR RATIO OF STEAM TO CHLORINE IN SAID GAS MIXTURE BEING LESS THAN ABOUT 150 TO 1 AND SUCH AS TO PROVIDE AN EQUILIBRIUM CHLORIDE CONTENT ON THE UPSTREAM PORTION OF THE CATALYST OF AT LEAST ABOUT 0.6% BY WEIGHT, BASIS CATALYST, CONTINUING AND CONTACTING UNTIL THE AMOUNT OF CHLORIDE DEPOSITED ON THE UPSTREAM PORTION OF THE CATALYST IS SUBSTANTIALLY EQUIVALENT TO THE THEORETICAL AMOUNT REQUIRED TO BRING THE TOTAL CATALYST INVENTORY TO THE DESIRED LEVEL WHICH IS LESS THAN 0.6A% BY WEIGHT, INCREASING THE STEAM TO CHLORINE RATIO IN THE GAS MIXTURE TO A VALUE ABOVE ABOUT 150 TO 1 AND WHICH GIVES THE DESIRED EQUILIBRIUM CHLORIDE CONTENT ON THE CATALYST, AND CONTINUING THE CONTACTING AT SAID INCREASED STEAM TO CHLORINE RATIO UNTIL THE TOTAL CATALYST INVENTORY IS SUBSTANTIALLY AT SAID DESIRED EQUILIBRIUM CHLORIDE CONTENT.

Claim 2

A METHOD FOR THE REGENERATION AND REACTIVATION OF A SUPPORTED PLATINUM CATALYST DEACTIVATED BY THE ACCUMULATION OF CARBONACEOUS DEPOSITS THEREON AS WELL AS BY THE AGGLOMERATION OF THE PLATINUM INTO LARGE CRYSTALLITES OF LOW ACTIVITY WHICH COMPRISES REMOVIANG AT LEAST A PORTION OF THE CARBONACEOUS DEPOSITS BY CONTROLLED BURNING AT A TEMPERATURE BELOW ABOUT 1050*F., CONTACTING THE CATALYST AT A TEMPERATURE IN THE RANGE FROM ABOUT 700* TO 1050* F. WITH A GASEOUS MIXTURE CONTAINING OXYGEN, STEAM AND CHLORINE, THE MOLAR RATIO OF STEAM TO CHLORINE IN SAID GAS MIXTURE BEING LESS THAN ABOUT 150 TO 1 AND SUCH AS TO PROVIDE AN EQUILIBRIUM CHLORIDE CONTENT ON THE UPSTREAM PORTION OF THE CATALYST OF AT LEAST ABOUT 0.6% BY WEIGHT, BASIS CATALYST, CONTINUING AND CONTACTING UNTIL THE AMOUNT OF CHLORIDE DEPOSITED ON THE UPSTREAM PORTION OF THE CATALYST IS SUBSTANTIALLY EQUIVALENT TO THE THEORETICAL AMOUNT REQUIRED TO BRING THE TOTAL CATALYST INVENTORY TO THE DESIRED LEVEL WHICH IS LESS THAN 0.6A% BY WEIGHT, INCREASING THE STEAM TO CHLORINE RATIO IN THE GAS MIXTURE TO A VALUE ABOVE ABOUT 150 TO 1 AND WHICH GIVES THE DESIRED EQUILIBRIUM CHLORIDE CONTENT ON THE CATALYST, AND CONTINUING THE CONTACTING AT SAID INCREASED STEAM TO CHLORINE RATIO UNTIL THE TOTAL CATALYST INVENTORY IS SUBSTANTIALLY AT SAID DESIRED EQUILIBRIUM CHLORIDE CONTENT.