Alumina-aluminum phosphate-silica-zeolite catalyst

A catalyst for increasing the gasoline yield and quality in a petroleum cracking reaction under catalytic cracking conditions comprising an alumina-aluminum phosphate-silica matrix characterized after calcination at 500.degree. C. for 16 hours as amorphous, and having an average pore radius of from about 10 A to about 200 A;

• a surface area ranging from about 50 m.sup.2 /g to about 300 m.sup.2 /g;
• a pore volume of from about 0.1 cc/g to about 1.2 cc/g;
• and wherein the alumina-aluminum phosphate-silica matrix has a mole percent ratio of from about 15:80:5 to about 60:10:30 and wherein said matrix retains at least 70% of its surface area when the matrix is additionally calcined at a temperature up to about 900.degree. C. for about 16 hours;
• said matrix being composited with from about 5 to about 50 weight percent of a zeolite having cracking activity.