Reactivating hydroforming catalysts

Claim 1

IN THE HYDROFORMING A NAPHTHAS IN THE PRESENCE OF A HALOGEN-CONTAINING CATALYST COMPRISING PLATINUM GROUP METAL SUPPORTED ON ALUMINA IN WHICH A NAPHTHA IS CONTACTED WITH A FIXED BED OF CATALYST IN THE PRESENCE OF HYDROGEN UNDER HYDROFORMING CONDITIONS OF TEMPERATURE, PRESSURE AND CONTACTING TIME AND THEN REGENERATED, THE IMPROVEMENT WHICH COMPRISES TREATING THE REGENERATED CATALYST BY CHLORINATING THE CATALYST TO A CHLORINE LEVEL BETWEEN ABOUT 0.70 AND 1.00 WT. PERCENT ON THE CATALYST BY FIRST TREATING SAID CATALYST AT AN ELEVATED TEMPERATURE OF ABOUT 500*F. AND A PRESSURE BETWEEN ABOUT 0 AND 400 P.S.I.G. WITH A WATER-CONTAINING TREAT GAS WHICH IS SATURATED WITH WATER SO AS TO CONTAIN 500-5000 V.P.P.M. OF WATER UNTIL THE PARTIAL PRESSURE OF THE WATER IN SAID CATALYST IS AT EQUILIBRIUM WITH SAID GAS AND THEN PASSING THROUGH SAID FIXED BED OF WATER SATURATED CATALYST A GAS CONTAINING 0.02 TO 1.0 MOL PERCENT CHLORINE, .02 TO 1.0 MOL PERCENT WATER, 0 TO 21 MOL PERCENT OXYGEN AND NITROGEN AT AN ELEVATED TEMPERATURE OF ABOUT 500*F.800*F. AT A TREATING GAS RATE OF 3 TO 30 S.C.F./HR./LB. OF CATALYST AND UNDER A PRESSURE OF BETWEEN 0 AND 400 P.S.I.G. UNTIL CHLORINE BREAKTHROUGH AND CHLORINE GAS IS DETECTED IN THE EXITING GAS.