초록 ▼

A metal combustion promoter is introduced to the circulating inventory of catalyst in a catalytic cracking unit as a mixture of particles rich in metal with particles free of metal such that the net concentration of metal in the mixture is about 1 to 10 ppm. According to a preferred embodiment the p

A metal combustion promoter is introduced to the circulating inventory of catalyst in a catalytic cracking unit as a mixture of particles rich in metal with particles free of metal such that the net concentration of metal in the mixture is about 1 to 10 ppm. According to a preferred embodiment the particles rich in metal contain about 50 ppm of platinum, iridium, osmium, palladium, rhodium, ruthenium or rhenium. When such mixtures are supplied to the circulating inventory, it is found that specific activity of the metal is enhanced in the sense that activity of the mixture for oxidation of carbon monoxide is higher than that of catalyst in which an equal amount of metal is evenly distributed among all the particles.

대표청구항 ▼

A catalyst mixture adapted for addition to a plant for continuous catalytic cracking of hydrocarbons and continuous oxidation regeneration of spent catalyst from said catalytic cracking with combustion of CO during said regeneration which mixture comprises an intimate and substantially uniform blend

A catalyst mixture adapted for addition to a plant for continuous catalytic cracking of hydrocarbons and continuous oxidation regeneration of spent catalyst from said catalytic cracking with combustion of CO during said regeneration which mixture comprises an intimate and substantially uniform blend of a minor portion of particles containing from 20 to 80 ppm of platinum, iridium, osmium, palladium, rhodium, ruthenium or rhenium and a major portion of active cracking catalyst, the proportions of said minor and major portions being such that said blend contains no more than 10 ppm of said metal. A mixture according to claim 1 wherein the particles of said minor portion are constituted by calcined spray dried kaolin clay impregnated with said metal. A mixture according to claim 5 wherein said major portion of active cracking catalyst is a rare earth zeolite Y type cracking catalyst. A mixture according to claim 1 wherein both said major and minor portions are constituted by rare earth zeolite Y type cracking catalyst.