Patent ID: 8137535

Claim:
A method for doping hydrocarbon cracking catalyst, comprising: fluidizing one or more coked-catalyst particles in the presence of one or more oxidants to provide a fluidized mixture; removing at least a portion of the coke from the one or more coked-catalyst particles to provide regenerated catalyst particles within the fluidized mixture; distributing one or more doping agents to the fluidized mixture; depositing the one or more doping agents onto a surface of the regenerated catalyst particles to provide one or more doped catalyst particles; and cracking a hydrocarbon feed in the presence of the one or more doped catalyst particles to provide a hydrocarbon product, wherein; the hydrocarbon product comprises ethylene, propylene, and aromatic hydrocarbons, an amount of at least one of ethylene and propylene in the hydrocarbon product is at least 5 wt % based on a weight of the hydrocarbon feed, and cracking the hydrocarbon feed cokes the one or more doped catalyst particles to provide the one or more coked-catalyst particles for the fluidized mixture; wherein the one or more doping agents comprise gallium and at least one of magnesium, barium, ruthenium, rhodium, and palladium.