A catalyst composition comprising a minor amount of a low acidity, highly dealuminated ultra stable Y
zeolite having an
Alpha value of less than about 5, preferable less than about 3 and Broensted acidity measured by FT-IR from about 1 to about 20, preferably from about 1-10, micro mole / g of, a homogeneous,
amorphous silica-
alumina cracking component having an SB ratio of from about 0.7 to about 1.3, wherein a crystalline
alumina phase is present in an amount of no greater than about 10%, preferably no greater than 5% and a catalytic amount of hydrogenation component selected from the group consisting of a Group VI
metal, a Group VIII
metal, and mixtures thereof is disclosed. The present invention provides for a process for converting hydrocarbonaceous oils comprising contacting the hydrocarbonaceous oils with the catalyst under suitable
hydrocarbon conversion conditions. Such processes in include, but are not limited to,
single stage hydrocracking, two-stage hydrocracking, series-flow hydrocracking, mild hydrocracking, lube hydrocracking, hydrotreating, lube hydrofinishing, hydrodesulphurization, hydrodenitrification, catalytic dewaxing and catalytic
cracking.