Catalyst and procedure for catalytic splitting

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The catalyst comprises a crystalline aluminosilicate zeolite, gibbsite, a rare earth metal compound and a silica matrix prepared from at least one of a silica sol made by an ion-exchange process and an acidic silica sol prepared by mixing sodium silicate, an acid and an aluminum salt of an acid. The catalyst has improved selectivity for hydrocarbons conversion over coke formation in a FCC process.