To enable the use of a catalyst compsn. in the hydrotreatment of a hydrocarbon mixture by constituting the catalyst compsn. of beta zeolite, a group VIII metal, a group VIB metal and, if desired, at least one oxide being a carrier.
A catalyst compsn. contains beta zeolite, a group VIII metal, a group VIB metal and, if desired, at least one oxide being a carrier. A catalyst to be used contains cobalt or nickel as the group VIII metal and molybdenum or tungsten as the group VIB metal. Pref., cobalt and molybdenum are used. Oxide used as the carrier is oxide of an element Z selected from silicon, aluminum, titanium, zirconium and a mixture of them. The carrier of the catalyst compsn. can comprise at least one kind of oxide and the oxide to be used is set to alumina or alumina mixed with an oxide selected from those of silica and zirconia.