EFFECTS OF BORON IN CO-MO B-AL2O3 HYDROTREATMENT CATALYSTS/

Several mild hydrocracking 3 wt.-% Co-10 wt.-% Mo/B-Al2O3 catalysts ha ve been prepared by adding H3BO3 into a boehmite dough during kneading + extrusion, drying and calcination prior to impregnation. HDS, HDN a nd cracking were monitored in the hydrotreatment of a VGO feedstock an d the optimum B content was estimated around 3 wt.-%. The effects of b oron on these catalysts will be discussed here with a particular focus on the effect of boron during impregnation. Using a simple hydrotherm al treatment method by soxhlet, B can be extracted, with hot water, fr om catalysts and from supports. Simultaneously, on supports calcined a t 600 degrees C, the formation of a boehmite phase was detected after extraction.