Modified aluminas and the use thereof in FCC catalysts
AssigneePetroleo Brasiliero S.A. - Petrobras
InventorJose Carlos Duarte Macedo
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Abstract
A modified alumina is useful as metals passivator in fluidizable catalytic cracking catalysts. The modified alumina is prepared from a hydrated alumina, e.g., gibbsite, which is reacted with a low-molecular weight organic acid, e.g., acetic acid, forming aluminum salts. Calcination of the modified alumina results in decomposition of the aluminum salt.
Claims2
A fluidizable cracking catalyst comprising a matrix, from about 5 to about 50 weight percent of a crystalline, zeolitic aluminosilicate and from about 2 to about 80 weight percent of a modified alumina having a pore size distribution, determined after calcining said alumina at 788° C. for 3 hours, and with reference to a nitrogen desorption curve, such as to give an average pore diameter in the range of from about 2 to about 14 nm, with at least about 60 percent of the total pore volume being in pores having a diameter in the range of from about 2 to about 20 nm, said pore size distribution having been determined on the alumina independent of the remaining catalyst components.
Dependencies are inferred from the claim text.