| 摘要 |
PROBLEM TO BE SOLVED: To obtain a hydrogenation catalyst which exhibits an excellent denitrification activity, a high degradation resistance, and a long life by causing a fibrous alumina carrier having a specified average length to carry a metal selected from among metals of the groups VIA and VIII. SOLUTION: The medium-gravity distillate of a coal liquefaction oil is a coal-derived hydrocarbon oil having a b.p. in the range of 100-350 deg.C, and heavy naphtha, kerosene, a gas oil distillate, etc., belong to this category. The fibrous alumina carrier is bundles of fibrous alumina particles having an average length of 5-15 nm, The hydrogenation catalyst is prepared by causing the fibrous alumina carrier to carry a metal selected from among metals of the groups VIA and VIII by a conventional method such as impregnation, immersion or kneading. The metal is e.g. molybdenum, tungsten, cobalt or nickel, tungsten or nickel being especially preferable. The amount of a metal (as an oxide) carried is preferably 20-35 wt.% in the case of a group VIA metal and 3-5 wt.% in the case of a group VIII metal.
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