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A catalyst for treating heavy hydrocarbon feedstocks. The catalyst comprises a calcined particle comprising a co-mulled mixture made by co-mulling inorganic oxide powder, molybdenum trioxide powder, and a nickel compound or cobalt compound, or both compounds, and then forming the co-mulled mixture i

A catalyst for treating heavy hydrocarbon feedstocks. The catalyst comprises a calcined particle comprising a co-mulled mixture made by co-mulling inorganic oxide powder, molybdenum trioxide powder, and a nickel compound or cobalt compound, or both compounds, and then forming the co-mulled mixture into a particle that is calcined to provide the calcined particle. The calcination is conducted at a temperature such that at least 20% of the pore volume of the calcined particle is in pores of greater than 5,000 Å and less than 70% of the pore volume of the calcined particle is in the pores having a pore size in the range of from 70 to 250 Å.

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1. A hydroprocessing catalyst having an enhanced vanadium removal activity and providing for treating a heavy hydrocarbon feedstock to yield a treated product having enhanced product stability, wherein said hydroprocessing catalyst comprises: a calcined particle comprising a co-mulled mixture made b

1. A hydroprocessing catalyst having an enhanced vanadium removal activity and providing for treating a heavy hydrocarbon feedstock to yield a treated product having enhanced product stability, wherein said hydroprocessing catalyst comprises: a calcined particle comprising a co-mulled mixture made by co-mulling inorganic oxide powder, molybdenum trioxide powder, and Group VIII metal particles and then forming said co-mulled mixture into a particle that is calcined to thereby provide said calcined particle, wherein said calcined particle has a total surface area exceeding 250 m2/gram and a pore structure such that at least 20% of the total pore volume of said calcined particle is in the pores of said calcined particle having pore diameters greater than 5,000 Å and less than 70% of the total pore volume of said calcined particle is in the pores of said calcined particle having pore diameters in the range of from 70 Å to 250 Å, as measured by mercury penetration, and wherein said calcined particle has a molybdenum content in the range of from 3 weight percent to 12 weight percent with the weight percent being based upon the molybdenum as MoO3 and the total weight of said calcined particle, a nickel content in the range of from 0.2 weight percent to 6 weight percent based on the nickel as NiO and the total weight of said calcined particle, and a cobalt content in the range of from 0.2 weight percent to 6 weight percent with the weight percent being based upon the cobalt as CoO and the total weight of said calcined particle. 2. A hydroprocessing catalyst as recited in claim 1, wherein the calcining of said particle is conducted under a controlled temperature condition at a calcination temperature in the range of from 482° C. (900° F.) to 787.7° C. (1450° F.) for a calcination time period so as to provide said calcined particle having said pore structure. 3. A hydroprocessing catalyst as recited in claim 2, wherein said molybdenum trioxide powder of said co-mulled mixture is in a finely divided state of particulate molybdenum trioxide either as a finely divided powdered solid or as a suspension wherein said particulate molybdenum trioxide is of a particle size having a maximum dimension of less than 500 μm. 4. A hydroprocessing catalyst as recited in claim 3, wherein said particulate molybdenum trioxide used in the formation of said co-mulled mixture comprises particles having a maximum dimension in the range of from 0.2 to 150 μm. 5. A hydroprocessing catalyst as recited in claim 3, wherein at least 50 percent of said particulate molybdenum trioxide are particles having a maximum dimension in the range of from 2 to 15 μm. 6. A hydroprocessing catalyst as recited in claim 1, wherein said inorganic oxide material is selected from the group consisting of alumina, silica and alumina-silica. 7. A hydroprocessing catalyst as recited in claim 1, wherein said co-mulling step is conducted such that said co-mulled mixture has a pH that is maintained in the range of from 6 to 9 by addition of ammonium salts or ammonium hydroxide. 8. A hydroprocessing catalyst as recited in claim 1, wherein said co-mulled mixture consists essentially of molybdenum trioxide, cobalt oxide, nickel oxide, a phosphorous component and an inorganic oxide material. 9. A process comprising: contacting a heavy hydrocarbon feedstock having a nickel content in the range of from 0.1 ppmw to 250 ppmw, a vanadium content in the range of from 0.3 ppmw to 250 ppmw, and a sulfur content in the range of from 0.5 wt % to 8 wt % with the catalyst of claim 1. 10. A method of making a hydroprocessing catalyst having an enhanced vanadium removal activity and providing for treating a heavy hydrocarbon feedstock to yield a treated product having enhanced product stability, wherein said method comprises: co-mulling inorganic oxide powder, molybdenum trioxide powder, and Group VIII metal particles to form a co-mulled mixture; forming said co-mulled mixture into a particle; and calcining said particle under a controlled temperature condition at a calcination temperature in the range of from 482° C. (900° F.) to 787.7° C. (1450° F.) for a calcination time period so as to provide a calcined particle having a total surface area exceeding 250 m2/gram and a pore structure such that at least 20% of the total pore volume of said calcined particle is in the pores of said calcined particle having pore diameters greater than 5,000 Å and less than 70% of the total pore volume of said calcined particle is in the pores of said calcined particle having pore diameters in the range of from 70 Å to 250 Å, as measured by mercury penetration; wherein the amounts of inorganic oxide powder, molybdenum trioxide powder, and Group VIII metal particles used to form said particle are such as to provide said calcined particle having a molybdenum content in the range of from 3 weight percent to 12 weight percent with the weight percent being based upon the molybdenum as MoO3 and the total weight of said calcined particle, a nickel content in the range of from 0.2 weight percent to 6 weight percent based on the nickel as NiO and the total weight of said calcined particle, and a cobalt content in the range of from 0.2 weight percent to 6 weight percent with the weight percent being based upon the cobalt as CoO and the total weight of said calcined particle. 11. A method as recited in claim 10, wherein said molybdenum trioxide powder of said co-mulled mixture is in a finely divided state of particulate molybdenum trioxide either as a finely divided powdered solid or as a suspension wherein said particulate molybdenum trioxide is of a particle size having a maximum dimension of less than 500 μm. 12. A method as recited in claim 11, wherein said particulate molybdenum trioxide used in the formation of said co-mulled mixture comprises particles having a maximum dimension in the range of from 0.2 to 150 μm. 13. A method as recited in claim 11, wherein at least 50 percent of said particulate molybdenum trioxide are particles having a maximum dimension in the range of from 2 to 15 μm. 14. A method as recited in claim 10, wherein said inorganic oxide material is selected from the group consisting of alumina, silica and alumina-silica. 15. A method as recited in claim 10, wherein said co-mulling step is conducted such that said co-mulled mixture has a pH that is maintained in the range of from 6 to 9 by addition of ammonium salts or ammonium hydroxide. 16. A method as recited in claim 10, wherein said co-mulled mixture consists essentially of molybdenum trioxide, cobalt oxide, nickel oxide, a phosphorous component and an inorganic oxide material. 17. A composition made by the method of claim 10. 18. A process comprising contacting a heavy hydrocarbon feedstock having a nickel content in the range of from 0.1 ppmw to 250 ppmw, a vanadium content in the range of from 0.3 ppmw to 250 ppmw, and a sulfur content in the range of from 0.5 wt % to 8 wt % with a composition made by the method of claim 10.