Patent ID: 8530373

Claim:
A composition for use as a distillate hydrodesulfurization catalyst in the manufacture of an ultra-low sulfur distillate product, wherein said composition comprises: a calcined mixture made by calcining a co-mulled mixture comprising an inorganic oxide material, molybdenum trioxide in the form of finely defined particles having a maximum dimension of less than 150 mm, and a Group VIII metal compound selected from the group consisting of a nickel compound and a cobalt compound, wherein said calcined mixture has a molybdenum content in the range of from 10 weight percent to 22 weight percent with the weight percent being based upon the molybdenum as metal and the total weight of said calcined mixture, and a Group VIII metal content in the range of from 3 weight percent to 12 weight percent with the weight percent being based upon the Group VIII metal in its elemental form and the total weight of said calcined mixture, wherein said calcined mixture has a pore structure that includes a pore size distribution for said calcined mixture such that at least 70% of the total pore volume of said calcined mixture is in the pores of said calcined mixture having a diameter in the range of from 70 A to 150 A, wherein said calcined mixture has a mean pore diameter in the range of from 50 angstroms to 100 angstroms, and wherein said calcined mixture has less than 1 percent of the total pore volume in macropores having a pore diameter greater than 1000 angstroms, said calcined mixture being further characterized by having said molybdenum content and Group VIII metal content substantially uniformly dispersed within said inorganic oxide material, wherein crushed fines of a fresh, promoted, tri-metallic hydrotreatinq catalyst are mixed by co-mullinq with said inorganic oxide material and said finely divided particles of molybdenum trioxide prior to calcination of said co-mulled mixture.