Importance

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Abstract

This invention relates to a method for preparing a hydrodesulfurization catalyst which comprises (a) preparing a filter cake of amorphous alumina hydrate at a pH of 7.5-10.5; (b) dewatering the above prepared filter cake by a filter press to raise the Al.sub.2 O.sub.3 concentration to 28-35% by weight and kneading the dewatered filter cake for at least 10 seconds by a self-cleaning type kneader; (c) kneading the dough obtained from the step (b) while adding respective aqueous solutions of water-soluble salts of Group VIB and Group VIII catalyst metals respectively in an amount of 20-60% by weight (as a metal amount) of the total metal amount used at the position just before the entrance of a kneader, kneading the resultant mixture and extruding the kneaded mixture by an extruder; (d) drying and calcining the extrudate; and (e) impregnating the calcined product with salts of remaining catalyst metals in an aqueous ammonia solution and drying and calcining the resultant product.

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First Claim