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A hydrorefining catalyst of a hydrogenation active metal component supported on a refractory porous carrier has a median pore diameter determined by the nitrogen adsorption method of 8 to 20 nm, a pore volume determined by the nitrogen adsorption method of 0.56 cm 3 /g or greater, and a pore volume

A hydrorefining catalyst of a hydrogenation active metal component supported on a refractory porous carrier has a median pore diameter determined by the nitrogen adsorption method of 8 to 20 nm, a pore volume determined by the nitrogen adsorption method of 0.56 cm 3 /g or greater, and a pore volume of pores with a pore diameter of 50 nm or larger determined by the mercury intrusion porosimetry method of 0.32 cm 3 /g or greater. Both the demetallizing activity and metal deposition capacity of the catalyst in hydrogenation and demetallizing of heavy oil are high. The hydrorefining catalyst is obtained by kneading a porous starting powder principally composed of γ-alumina and having a pore capacity of 0.75 m 3 /g or larger and a mean pore diameter of 10 to 200 μm, molding and calcining, and supporting an active metal component on the product.

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1. A hydrorefining catalyst comprising a hydrogenation active metal component supported on a refractory porous carrier, wherein a median pore diameter determined by the nitrogen adsorption method is 8 to 20 nm, a pore volume determined by the nitrogen adsorption method is 0.56-1.0 cm 3 /g, and a po

1. A hydrorefining catalyst comprising a hydrogenation active metal component supported on a refractory porous carrier, wherein a median pore diameter determined by the nitrogen adsorption method is 8 to 20 nm, a pore volume determined by the nitrogen adsorption method is 0.56-1.0 cm 3 /g, and a pore volume of pores having a pore diameter 50 nm or larger determined by the mercury intrusion porosimetry method is 0.32-1.1 cm 3 /g, wherein the pore volume of all pores determined by the mercury intrusion porosimetry method is 0.87 cm 3 /g or greater. 2. A hydrorefining catalyst according to claim 1, therein the catalyst is used in demetallizing or deasphaltening of heavy oil. 3. A hydrorefining catalyst according to claim 1, wherein a pore volume of pores with a pore diameter of not less than 1,000 nm measured by the mercury intrusion porosimetry method is not more than 0.2 cm 3 /g. 4. A hydrorefining catalyst according to claim 1, wherein the catalyst has a bulk density of 0.52 g/cm 3 or less. 5. A hydrorefining catalyst according to claim 1, wherein the catalyst comprises 2 to 6 wt % molybdenum and 0.5 to 2 wt % nickel or cobalt as the hydrogenation active metal component. 6. A hydrorefining catalyst according to claim 1, wherein the catalyst comprises 0.5 to 1.5 wt % phosphorus or boron. 7. A hydrorefining catalyst according to claim 1, wherein the catalyst is molded by extrusion molding. 8. A hydrorefining catalyst according to claim 1, wherein the catalyst exhibits an effective amount of metal deposition that is 70 g or more per 100 g of fresh catalyst. 9. A hydrorefining catalyst according to claim 1, wherein the catalyst is used for demetallization treatment of heavy oil containing 45 ppm by weight or more of nickel or vanadium with respect to metal weight. 10. A hydrorefining catalyst according to claim 1, wherein the catalyst is used for deasphaltening treatment of heavy oil containing 3% or more asphaltene component. 11. A method of producing a hydrorefining catalyst comprising a hydrogenation active metal, comprising the steps of:kneading a porous starting powder whose main component is crystalline γ-alumina wherein the crystalline γ-alumina in the porous starting powder is present at 90 weight t or more and wherein the crystalline γ-alumina has a pore volume of 0.75 cm 3 /g or greater and a mean particle diameter of 10 to 200 μm to prepare a kneaded product;molding and calcining said kneaded product; andsupporting the active metal component on the kneaded product or on the kneaded product after calcining. 12. A method of producing a hydrorefining catalyst according to claim 11, wherein the crystalline γ-alumina is crystalline γ-alumina that has been obtained by calcining boehmite powder. 13. A method of producing a hydrorefining catalyst according to claim 12, wherein the molding is performed by extrusion molding.