Patent ID: 6903048

Claim:
A method for producing a hydrorefining catalyst containing cobalt and/or nickel, molybdenum, and phosphorus by bringing an impregnation solution into contact with a carrier formed of inorganic porous oxide, the method comprising: preparing, without using any oxidizing agent and reducing agent, the impregnation solution containing cobalt and/or nickel, molybdenum, phosphorus, and citric acid in which a molar ratio of molybdenum/phosphorus is 6 to 13, a molar ratio of (cobalt and nickel)/phosphorus is 0.5 to 7, and a molar ratio of (cobalt and nickel)/citric acid is 0.5 to 2; bringing the carrier into contact with the impregnation solution; and calcinating the carrier having been brought into contact with the impregnation solution, in an oxidizing atmosphere at a temperature at which citric acid is removed, wherein a Raman spectroscopy spectrum of the impregnation solution has a peak between 940 cm −1 to 950 cm −1 .