Rare earth exchanged layered silicate catalysts

Reactivation of metal-contaminated cracking catalysts

Reactivation of spent catalytic cracking catalyst

Reactivation of steam-deactivated catalysts

Reclaiming wax contaminated lubricating oils

Recovery of metal values from petroleum residua and other fracti

Recracking of cat naphtha for maximizing light olefins yields

Recycle of oily refinery wastes

Recycle of waste streams

Reduced chaos cyclone separation

Reduced NOx combustion promoter for use in FCC processes

Reducing NO.sub.x emissions with antimony additive

Reducing NO.sub.x emissions with group IIIB compounds

Reducing NO.sub.x emissions with zinc catalyst

Reducing sulfur trioxide concentration in regeneration zone flue

Reduction of coker furnace tube fouling in a delayed coking...

Reduction of foaming in a slurry catalyst hydrocarbon conversion

Reduction of gas phase reduced nitrogen species in partial...

Reduction of gas phase reduced nitrogen species in partial...

Reduction of SO.sub.x in regenerator off gas of a fluid cracking