Borium-containing catalyst.

摘要

A catalyst composition for converting hydrocarbons in a hydrotreatment process (hydrodesulphurisation and/or hydrodenitrogenation) and simultaneously cracking them, containing an alumina-silica-alumina carrier built up from alumina and silica-alumina, on which hydrogenation metals, such as molybdenum, nickel, and/or cobalt, have been provided and which also contains a catalytically active amount of borium, generally in the range of 1-20 wt.%. The invention also relates to a process for the preparation of such a catalyst, with borium being provided ahead of the Group VIII component, and with favourable effects being obtained if at least one calcination step is carried out between the borium being added and the addition of the Group VIII metal. The carrier material used may be made up of mixtures of alumina and amorphous silica-alumina or of mixtures of alumina and silica-coated alumina. The catalyst composition is highly suitable for converting vacuum gas oil into middle distillate oils by hydrotreatment.