Phosphorus-containing catalyst and catalytic cracking process utilizing the same

Claim 1

A catalytic cracking process comprising contacting a hydrocarbonaceous feed at catalytic cracking conditions with a catalyst comprising a Y-type crystalline aluminosilicate zeolite prepared from a clay starting material, a residue derived from said clay, and at least about 0.1 weight percent phosphorus, based on the weight of said zeolite plus residue, said Y-type crystalline aluminosilicate zeolite having the structure of faujasite and having a silica to alumina mole ratio of at least about 3:1, said catalyst having been prepared initially by the steps which comprise: (a) ion exchanging a clay derived alkali metal-containing Y-type crystalline aluminosilicate zeolite and the clay derived residue with a cation other than an alkali metal to decrease the alkali metal content of said alkali metal-containing zeolite; (b) calcining the resulting ion exchanged zeolite and clay derived residue, and (c) contacting the resulting calcined zeolite and clay derived residue with an anion selected from the group consisting of dihydrogen phosphate anion, dihydrogen phosphite anion and mixtures thereof and with at least one ammonium salt other than a salt of an inorganic acid of phosphorus, for a time sufficient to composite said amount of phosphorus with said calcined zeolite and residue and to decrease additionally the alkali metal content of said zeolite.