Method for preparing zirconium-containing hydrodemetallization catalyst

The invention discloses a method for preparing a zirconium-containing hydrodemetallization catalyst. The method comprises the steps of 1, impregnating a physical pore-enlarging agent I in hydrogenation activity component impregnation liquid I and zirconium-containing solution I respectively, impregnating a physical pore-enlarging agent II in hydrogenation activity component impregnation liquid II and zirconium-containing solution II respectively, and drying the impregnated physical pore-enlarging agent I and physical pore-enlarging agent II for use; 2, conducting mix-kneading on the physical pore-enlarging agent I and physical pore-enlarging agent II obtained from step 1 and pseudo-boehmite dry gelatine powder, chemical pore-enlarging agent, extrusion aid and peptizing agent to form a plasticizer, conducting band extrusion and drying, roasting dried materials in the nitrogen atmosphere, and then conducting roasting in the air to obtain a modified alumina supporter; 3, impregnating the modified alumina supporter obtained in step 2 in hydrogenation activity component impregnation liquid III, and conducting drying and roasting to obtain the zirconium-containing hydrodemetallization catalyst. The content of active metal in the catalyst prepared with the method is relatively high at the positions of large pores and is relatively low at the positions of small pores, and the utilization rate of large pores is increased remarkably. The hydrodemetallization catalyst has high activity and long-term operation stability.