Hydrodesulfurization catalyst for hydrocarbon oil, process of producing same and method for hydrorefining

A process of producing a hydrodesulfurization catalyst for hydrocarbon oil, comprising:

• (1) a first step of mixing a basic aluminum salt aqueous solution and a mixed aqueous solution of a titanium mineral acid salt and an acidic aluminum salt in the presence of silicate ion so that the pH is from 6.5 to 9.5 to produce a hydrate;
• (2) a second step of producing a support by washing, extruding, drying and calcining the hydrate in turn;
• (3) a third step of contacting the support with an impregnating solution containing at least one type of metal component selected from VIA and VIII groups of the periodic table (provided that molybdenum is indispensably contained) and a chelating agent;
• (4) a fourth step of drying the support with the metal supported thereon, produced by contacting the support with the impregnating solution to produce a hydrodesulfurization catalyst Y;
• and
• (5) a fifth step of pre-sulfurizing the hydrodesulfurization catalyst Y,
• the total area (titania diffraction peak area) of the diffraction peak area indicating the crystal structure of anatase titania (101) planes and the diffraction peak area indicating the crystal structure of rutile titania (110) planes in the support, measured by X-ray diffraction analysis being ¼ or less of the diffraction peak area (alumina diffraction peak area) indicating the aluminum crystal structure assigned to γ-alumina (400) planes,
• the molybdenum being formed into molybdenum disulfide crystal and disposed in layers on the support by the pre-sulfurization, and the molybdenum disulfide crystal layers having an average length of longer than 3.5 nm and 7 nm or shorter in the plane direction and an average number of laminated layers of more than 1.0 and 1.9 or fewer,
• the impregnating solution having a peak intensity in the range of 940 to 950 cm−1 2.5 times or more of the peak intensity in the range of 890 to 910 cm−1 in the Raman spectrum.