Patent ID: 6046125
Filing Date: 2000-04-04
Classification: B01J

Abstract:
An aqueous process for enhancing the acid sites of a spent fluid catalytic cracking (FCC) catalyst, comprising the steps of:preparing an aqueous solution comprising water, about 0.1-3.0 percent-by-weight acid selected from the group consisting of sulfurous and sulfuric acid and about 0.1-3.0 percent-by-weight aluminum provided by an aluminum source selected from the group consisting of the alumina trihydrates and aluminum oxides where said aluminum source has less than about 1,000 ppm chloride as a trace constituent;adding to said solution a sufficient quantity of ammonium hydroxide to adjust the pH of said solution to about 3.0-12.0;adding a spent FCC catalyst to said solution in a weight ratio of about 1 part catalyst to about 1-10 parts water to produce an aqueous slurry;stirring said slurry for a time sufficient for the pH of said slurry to stabilize; andseparating said catalyst from said slurry.