METHOD FOR SUPPRESSING THE POISONING EFFECTS OF CONTAMINANT METALS ON CRACKING CATALYSTS IN FLUID CATALYTIC CRACKING

摘要

the contamination of the catalyst for cracking of metals such as nickel, vanadium and iron during the catalytic cracking of hydrocarbon charge containing the fluid metal contaminants can be prevented from deposition on the catalyst with small amounts of an agent of passiv e containing bismuth, preferably with a weight ratio of bismuth and nickel (nickel + 0, equivalentiron vanadium + 2) from about 0.01 to about 1: 1: 1. the passivating agent may also include mu00e9langesde composed of bismuth and antimony, bismuth, and tin.