Catalyst that comprises a partially amorphous Y zeolite and its use in hydroconversion of hydrocarbon petroleum feedstocks

A catalyst comprising:

• (1) at least one matrix and at least one partially amorphous Y zeolite that has a peak rate that is less than 0.4, a crystalline fraction, expressed relative to a reference zeolite in sodium form (Na), that is less than 60%, (2) at least one hydro-dehydrogenating element that is selected from the group consisting of the elements of group VII and the elements of group VIB, and (3) at least one promoter element that is selected from the group consisting of phosphorus, boron, and silicon,
• wherein the zeolite has the following characteristics:
• an overall Si/Al ratio that is greater than 15,
• an Si/Aliv framework ratio that is greater than or equal to the overall Si/Al ratio,
• a pore volume that is at least equal to 0.20 ml/g wherein between 8% and 50% of the pore volume consists of pores that have a diameter of at least 5 nm, and
• a specific surface area of 210-800 m2/g.