The sulfur content of liquid cracking products, especially the cracked
gasoline, of the catalytic cracking process is reduced by the use of a
sulfur reduction catalyst composition comprising a porous molecular sieve
which contains a metal in an oxidation state above zero within the
interior of the pore structure of the sieve as well as a rare earth
component which enhances the cracking activity of the cracking catalyst.
The molecular sieve is normally a faujasite such as USY. The primary
sulfur reduction component is normally a metal of Period 3 of the
Periodic Table, preferably vanadium. The rare earth component preferably
includes cerium which enhances the sulfur reduction activity of the
catalyst. The sulfur reduction catalyst may be used in the form of a
separate particle additive or as a component of an integrated
cracking/sulfur reduction catalyst.