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Hydroprocessing of hydrocarbon oils is carried out utilizing a catalyst containing active metal components on a porous refractory oxide and having a narrow pore size distribution, with essentially all pores being of diameter greater than about 100 angstroms, with less than about 10 percent of the to

Hydroprocessing of hydrocarbon oils is carried out utilizing a catalyst containing active metal components on a porous refractory oxide and having a narrow pore size distribution, with essentially all pores being of diameter greater than about 100 angstroms, with less than about 10 percent of the total pore volume being in pores of diameter greater than 300 angstroms, and with at least about 60 percent of the total pore volume being in pores of diameter from about 180 to about 240 angstroms. The catalyst is particularly useful for removing of contaminant metals from residuum hydrocarbon oils.

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1. A catalytic process for upgrading a hydrocarbon oil wherein said hydrocarbon oil is contacted under conditions of elevated temperature and pressure with a catalyst comprising one or more active metal components comprising Group VIB and Group VIII metals on a porous refractory oxide, said catalyst

1. A catalytic process for upgrading a hydrocarbon oil wherein said hydrocarbon oil is contacted under conditions of elevated temperature and pressure with a catalyst comprising one or more active metal components comprising Group VIB and Group VIII metals on a porous refractory oxide, said catalyst having at least about 60 percent of the total pore volume distributed in pores of diameter from about 180 to about 240 angstroms, with essentially all pores being of diameter greater than about 100 angstroms, and with less than about 10 percent of the total pore volume being in pores of diameter greater than about 300 angstroms. 2. The process defined in claim 1 wherein said catalyst contains active metal components comprising up to 30 weight percent of said Group VIB metal component, calculated as the trioxide, and up to 10 weight percent of said Group VIII metal component, calculated as the monoxide. 3. The process defined in claim 1 wherein said catalyst has a surface area greater than about 100 m 2 /gram. 4. The process defined in claim 1 wherein said catalyst has an averagel pore diameter greater than about 180 angstroms. 5. The process defined in claim 1 wherein said hydrocarbon oil is selected from the group consisting of top crudes, vacuum and atmospheric residual fractions, heavy vacuum distillate oils, shale oils, oils from bituminous sands and coal compositions. 6. The process defined in claim 1 wherein said catalyst has greater than about 90 percent of the total pore volume in pores of diameter greater than about 150 angstroms. 7. The process defined in claim 1 wherein said hydrocarbon oil contains more than about 2 ppmw of contaminant metals and at least about 1 weight percent of sulfur. 8. The process defined in claim 1 wherein said catalyst has a capacity for accumulating contaminant metals from a metals-containing hydrocarbon oil such that the weight of said catalyst is increased by at least about 25 percent due to accumulated contaminant metals, calculated as the free metals. 9. The process defined in claim 1 wherein said catalyst has less than about 25 percent of the total pore volume in pores greater than about 240 angstroms. 10. The process defined in claim 1 wherein said catalytic process comprises hydrodesulfurization. 11. The process defined in claim 1 wherein said catalytic process comprises hydrodemetallization. 12. The process defined in claim 1 wherein said catalytic process comprises hydrodenitrogenation. 13. The process defined in claim 1 wherein said conditions include an elevated temperature above 600° F., a pressure above 500 p.s.i.g. and the presence of hydrogen. 14. A catalytic hydrodesulfurization process wherein a hydrocarbon oil is upgraded under conditions including an elevated temperature from about 500° F. to about 900° F., a hydrogen pressure of about 500 to about 3,000 p.s.i.g. and a space velocity of about 0.05 to about 3.0 by contact with a catalyst comprising at least one active Group VIB metal component on a porous refractory oxide comprising alumina, said catalyst with an average pore diameter greater than about 180 angstroms, with at least about 60 percent of the total pore volume distributed in pores of diameter from about 180 to about 240 angstroms, with essentially all the pores being in diameter greater than about 100 angstroms, and with less than about 10 percent of the total pore volume being in pores of diameter greater than about 300 angstroms. 15. The process defined in claim 14 wherein said alumina consists essentially of gamma alumina. 16. The process defined in claim 14 wherein said porous refractory oxide contains at least about 90 weight percent of alumina. 17. The process defined in claim 14 wherein less than about 25 percent of the total pore volume of said catalyst is in pores of diameter greater than about 240 angstroms. 18. The process defined in claim 14 wherein said Group VIB metal is selected from the group consisting of molybdenum and tungsten. 19. The process defined in claim 14 wherein said catalyst comprises at least one Group VIII metal component. 20. The process defined in claim 19 wherein said Group VIII metal is selected from the group consisting of cobalt and nickel. 21. The process defined in claim 19 wherein said Group VIB metal comprises molybdenum and said Group VIII metal component comprises cobalt. 22. The process defined in claim 19 wherein said hydrocarbon oil is selected from the group consisting of vacuum residual fractions, atmospheric residual fractions, top crudes and heavy vacuum distillate oils. 23. The process defined in claim 19 further comprising up to about 10 weight percent of Group VIII metal components, calculated as the monoxides, and up to about 30 weight percent of Group VIB metal components, calculated as the trioxides. 24. The process defined in claim 14 wherein said catalyst has an average pore diameter from about 180 to about 220 angstroms. 25. The process defined in claim 14 wherein said catalyst has a capacity for accumulating contaminant metals from a metals-containing hydrocarbon oil such that the weight of said catalyst is increased by at least about 50 percent due to accumulated contaminant metals, calculated as the free metals. 26. The process defined in claim 14 wherein said catalyst has a surface area from about 100 2 /gram to about 200 m 2 /gram. 27. The process defined in claim 14 wherein said catalyst has a total pore volume from about 0.4 cc/gram to about 0.9 cc/gram. 28. The process defined in claim 14 wherein greater than about 95 percent of the total pore volume of said catalyst is in pores of diameter greater than about 140 angstroms. 29. The process defined in claim 14 wherein said hydrodesulfurization process comprises demetallization. 30. The process defined in claim 14 wherein said hydrodesulfurization process comprises desulfurization. 31. The process defined in claim 14 wherein said hydrodesulfurization process comprises denitrogenation. 32. A catalytic hydrodemetallization process wherein a hydrocarbon oil is contacted with a hydrodemetallization catalyst under conditions including an elevated temperature from about 600° F. to about 850° F. and a hydrogen pressure from about 500 to about 3000 p.s.ig., said catalyst comprising at least one Group VIB metal component on a porous refractory oxide consisting essentially of gamma alumina, said catalyst with an average pore diameter from about 180 to about 220 angstroms, with at least about 60 percent of the total pore volume distributed in pores of diameter from about 180 to about 240 angstroms, with essentially all the pores being of diameter greater than 100 angstroms, with less than about 10 percent of the total pore volume being in pores of diameter greater than 300 angstroms, with less than about 25 percent of the total pore volume being in pores of diameter greater than about 240 angstroms, with a surface area from about 100 m 2 /gram to about 200 m/ 2 gram, and with a total pore volume between about 0.45 cc/gram and about 0.8 cc/gram. 33. The process defined in claim 32 wherein said hydrocarbon oil comprises a vacuum or atmospheric residual fraction of a crude oil. 34. The process defined in claim 32 wherein said Group VIB metal comprises molybdenum and said cayalyst further comprises a Group VIII metal component. 35. The process defined in claim 32 wherein said catalyst further comprises up to about 10 weight percent of at least one Group VIII metal component, calculated as the monoxide, and up to about 30 weight percent of said Group VIB metal components, calculated as the trioxide. 36. The process defined in claim 32 wherein said catalyst has an average pore diaemter from about 190 to about 210 angstroms. 37. The process defined in claim 32 wherein said catalyst has a capacity for accumulating contaminant metals from said hydrocarbon oil such that the weight of said catalyst is increased by at least about 50 percent due to accumulated contaminant metals, calculated as the free metals. 38. A catalytic process for upgrading a hydrocarbon oil wherein said hydrocarbon oil is contacted under conditions of elevated temperature and pressure with a catalyst containing Group VIB and Group VII metals, a porous refractory oxide support comprising a narrow pore size distribution with essentially all pores being of diameter greater than about 100 angstroms, with less than about 10 percent of the total pore volume being in the pores of diameter greater than 300 angstroms, and with at least about 60 percent of the total pore volume being in pores of diameter distributed over a narrow range of about 60 angstroms within the 100 angstrom range of about 140 to about 240 angstroms. 39. The process defined in claim 38 wherein said support has a total pore volume from about 0.5 to about 2.0 cc/gram. 40. The process defined in claim 38 wherein said support has a surface area greater than about 100 m 2 /gram. 41. The process defined in claim 38 wherein said support has an average pore diameter greater than about 160 angstroms. 42. The process defined in claim 38 wherein said catalyst comprises up to 30 weight percent of said Group VIB metal component, calculated as the trioxide up to 10 weight percent of said Group VIII metal component, calculated as the monoxide. 43. The process defined in claim 38 wherein said conditions include an elevated temperature above 600° F., a pressure above 500 psig and the presence of hydrogen. 44. The process defined in claim 38 wherein said support comprises gamma alumina. 45. The process defined in claim 38 wherein said hydrocarbon oil is selected from the group consisting of top crudes, vacuum and atmospheric residual fractions, heavy vacuum distillate oils, shale oils, oils from bituminous sands and coal compositions. 46. The process defined in claim 38 wherein said catalytic process comprises hydrodesulfurization. 47. The process defined in claim 38 wherein said catalytic process comprises hydrodemetallization. 48. The process defined in claim 38 wherein said catalytic process comprises hydrodenitrogenation. 49. The process defined in claim 38 wherein said hydrocarbon oil contains more than about 25 ppmw of contaminant metals. 50. The process defined in claim 38 wherein said catalyst has a capacity for accumulating contaminant metals from a metals-containing hydrocarbon oil such that the weight of said catalyst is increased by at least about 50 percent due to accumulated contaminant metals, calculated as the free metals. 51. The process defined in claim 1 wherein said active metal components consist essentially of Group VIB and Group VIII metal components. 52. The process defined in claim 1 wherein said porous refactory oxide comprises gamma alumina. 53. The process defined in claim 14 wherein said catalyst consists essentialy of at least one active Group VIB metal component and at least one active Group VIII metal component. 54. The process defined in claim 38 said catalyst consists essentially of at least one Group VIB metal component and at least one Group VIII metal component on said porous refractory oxide.