New generation of hydrorefining catalysts

Alumonickelmolybdenum catalysts of the GP series for hydrorefining of heavy oil stock were developed and utilized on commercial scale. The development was carried out simultaneously in several directions: modification of alumooxide carriers by activating and stabilizing additions; optimization of porous structures, of the carriers and catalysts; working out of conditions for the catalyst impregnation by active component salts; selection of a method for the preparation of a basis for the carrier phosphating (by introduction of up to 5 % P₂O₅) promotes an increase in hydrodesulfurization activity of nickel-molybdenum catalyst in the process of vacuum distillate hydrorefining. It is also ascertained that modifiers - elements of groups 4-8 of the Periodic System - produce considerable stabilizing effect on Ni-Mo catalyst with P₂O₅ addition.