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A catalyst composition for the cracking of heavy oil, which has high cracking activity for heavy components in the heavy oil and features reduced deposition of coke. The catalyst composition is comprised of a zeolite, a mixed metal oxide, clay and a metal oxide, and the total acidity of a portion of

A catalyst composition for the cracking of heavy oil, which has high cracking activity for heavy components in the heavy oil and features reduced deposition of coke. The catalyst composition is comprised of a zeolite, a mixed metal oxide, clay and a metal oxide, and the total acidity of a portion of the catalyst; the portion being composed of the catalyst components other than the zeolite, is from 0.02 to 0.08 mmol/g.

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1. A catalyst composition for the catalytic cracking of heavy oil comprising a zeolite, a mixed metal oxide, clay, and a metal oxide, wherein the total acidity of a portion of said catalyst, said portion being composed of said catalyst components other than said zeolite, is from 0.02 to 0.08 mmol/g,

1. A catalyst composition for the catalytic cracking of heavy oil comprising a zeolite, a mixed metal oxide, clay, and a metal oxide, wherein the total acidity of a portion of said catalyst, said portion being composed of said catalyst components other than said zeolite, is from 0.02 to 0.08 mmol/g, wherein the metal oxide is selected from the group consisting of silica, alumina, titania, boria, magnesia, calcia, and zirconia and wherein said mixed metal oxide is selected from the group consisting of silica-alumina, silica-zirconia, silica-magnesia, silica-titania, silica-boria, alumina-calcia, alumina-boria and alumina-magnesia, wherein the silica content of said mixed metal oxide is from about 5 to about 30 wt. %. 2. The catalyst composition of claim 1 wherein the content of the zeolite is from about 1 to 40 wt. %, the content of the mixed metal oxide is from about 5 to 80 wt. %, the content of the metal oxide is from about 10 to 40 wt. %, and the content of the clay is from about 10 to 80 wt. %. 3. The catalyst composition of claim 1 wherein the zeolite is selected from the group consisting of zeolite Y, ultrastable Y zeolite, ZSM-5, and β-mordenite. 4. The catalyst composition of claim 1 wherein the clay is selected from the group consisting of kaolin, bentonite and kibushi clay.