Catalytic cracking using a cracking catalyst in admixture with particles of platinum group metal or rhenium on a substrate regenerated to up to about 0.1% coke

Claim 1

A process for the fluidized catalytic cracking of higher molecular weight hydrocarbon to produce gasoline or distillate fuel range hydrocarbon comprising: (a) contacting in a cracking zone said higher molecular weight hydrocarbon with a cracking catalyst which becomes deactivated with coke deposits while being employed in said cracking, and thereby producing gasoline or distillate fuel range hydrocarbon; (b) withdrawing coked cracking catalyst particles from said cracking zone, said catalyst particles being in admixture with particles containing platinum group metal or rhenium oxidation promoter supported on a substrate; (c) contacting said mixed particles in a regeneration zone with an oxygen-containing regeneration gas stream in excess of that required for substantially complete combustion of carbon monoxide formed and substantially complete burning of coke from said particles to provide effluent gas containing up to about 1 volume % carbon monoxide and regenerated catalyst particles having up to about 0.1% coke, the amount of said oxidation promoter being effective to enhance the oxidation of carbon monoxide at regeneration temperature, said amount being up to about 10 ppm based on said cracking catalyst, and the amount of said admixture of particles being sufficient to absorb the major amount of the heat from the combustion of said carbon monoxide and burning of said coke; (d) withdrawing from said regeneration zone oxidation promoter-containing particles admixed with cracking catalyst particles; and (e) returning said mixture to said cracking zone wherein cracking catalyst and said platinum group metal or rhenium oxidation promoter are contacted with said higher molecular weight hydrocarbon and said cracking is thereby obtained.