Reactivation of catalysts containing iron

Claim 1

THE PROCESS FOR REACTIVATING AN IRON OXIDE CATALYST CONTAINING A POTASSIUM COMPOUND PROMOTER USED IN DEHYDROGENATING A HYDROCARBON FROM THE CLASS CONSISTING OF BUTENE AND EHTYL BENZENE IN THE PRESENCE OF STEAM AT 1000* F. TO 1600* F. AND REPEATEDLY REGENERATED TO REMOVE COKE DEPOSITS BY CONTACT WITH AN OXIDIZING GAS AT 1000* F. TO 1300*F., SAID CATALYST CONTAINING AS ITS EFFECTIVE COMPONENTS, IRON OXIDE PROMOTED BY A MINOR AMOUNT OF THE POTASSIUM COMPOUND PROMOTER, AND SAID CATALYST BEING DEACTIVATED BY THE REPEATED REGENERATION, WHICH COMPRISES TREATING SAID USED AND DEACTIVATED CATALYST WITH CARBON MONOXIDE AT A TEMPERATURE BETWEEN 200* F. AND 800* F. AND SUBSEQUENTLY HEATING THE THUS TREATED CATALYST TO ABOVE 1000* F. IN THE PRESENCE OF STEAM SO THAT THE IRON IN THE CATALYST REMAINS IN THE OXIDE FORM BEFORE IT IS AGAIN USED AND DURING ITS USE IN THE DEHYDROGENATING SET FORTH.