HYDROCARBON CONVERSION CATALYST ADDITIVES AND PROCESSES

摘要

Magnetic separation of fluid cracking catalyst and magnetic hooks can be improved by adding antimony, in the feed or during catalyst manufacture, to enhance the magnetic susceptibility, thus increasing the separation efficiency of the older less active fluid cracking catalyst from the more desirable fraction for recycle. Antimony can also be used as a tag for determination of age distribution of said catalyst. Concentration levels of 0.005-15 wt.% antimony (Sb) on the catalyst or sorbent are preferred. The invention is particularly preferred on catalyst and sorbents which comprise at least about 0.001 wt.%, more preferably above about 0.01 wt.% iron, because the antimony has been found to enhance the magnetic susceptibility of iron-containing particulates.