| 摘要 |
PROBLEM TO BE SOLVED: To provide a spherical catalyst which has high resistance to sulfur compounds and high hydrogenation activity and is suitably used for reducing the content of aromatic compounds by subjecting hydrocarbon oil containing sulfur compounds or the like, especially a light oil fraction to hydrogenation treatment, and whose carrier can be produced by a simplified production process, and to provide a method of producing the catalyst. SOLUTION: The catalyst contains at least one kind of noble metal selected from noble metals of group VIII of the periodic table as an active component in a silica- magnesia spherical carrier in which magnesia is contained in the range of 25 to 50 wt.% expressed in terms of its oxide. The method of producing the catalyst comprises adding a solution of a polysaccharide to a gel of silica-magnesia hydrate, then mixing them so as to prepare paste in which the concentration is controlled, dropping the paste into a solution containing polyvalent metal ions to form spherical hydrogel, aging the formed gel, washing, drying, firing to obtain the spherical carrier, further impregnating a solution of at least one kind of noble metal selected from the noble metals of group VIII of the periodic table into the fired spherical carrier to support the metal on the carrier, and after drying, firing the dried carrier.
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