Catalytic cracking with reduced emissions of sulfur oxides
 Sulfur oxides are removed at least partially from the gaseous regenerator effluent of a fluid catalytic cracking unit operated with feedstock containing sulfur compounds and converted to hydrogen sulfide in the cracking zone by associating sulfur oxides in the gas with at least one rare earth compound, preferably cerium or a rare earth mixture rich in cerium, supported on discrete particles of alumina. The alumina particles may be a component of particles of a composite fluid cracking catalyst or separate fluidizable entities other than cracking catalyst and physically admixed with the catalyst particles. 
Atlantic Richfield Company
B B B B C C
B01D B01J B01J B01J C10G C10G
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John W. Harry E. Stanley M.
Byrne Jacobs Brown