CATALYTIC CRACKING WITH REDUCED EMISSION OF SULFUR OXIDES

摘要

1459953 Cracking catalyst STANDARD OIL CO 14 May 1974 [23 May 1973] 25001/75 Divided out of 1459952 Heading B1E A fluidisable cracking catalyst composition comprises a silica-alumina cracking catalyst matrix containing 10-50% wt alumina, from 0.1 to 10% wt of a crystalline aluminosilicate uniformly distributed throughout the matrix and from 0.25 to 5% wt of a Gp IIA metal or metals present in oxide form and distributed over the surface of the matrix by impregnation followed by calcination. The Gp IIA metal oxide or oxides may be applied by impregnation of the matrix followed by calcination. The preferred Gp IIA metal is magnesium or a mixture containing at least 50% mole magnesium. Calcium, strontium or barium may also be used. The crystalline aluminosilicate may be faujasite, chabozite or X- or Y-zeolite and is suitably rare earth, hydrogen or ammonium exchanged to reduce the sodium ion content below 0.5% wt. The catalyst is regenerated after use by calcination.