In this work we report the results of characterization and catalytic behavior of different CoMo-based catalysts supported on titania modified with lanthanum and cerium. Co and Mo contents of catalysts were between 25 and 100% of the corresponding amount of metals commonly found in commercial catalysts (Co + Mo = 12.85 wt %). For all catalyst a constant Co/Mo weight ratio was kept at about 0.22. Catalytic activities were evaluated using dibenzothiophene hydrodesulfurization as model reaction. On the bases of specific surface area results and XRD measurements analyses after hydrothermal deactivation, it was found that suitable contents of La and Ce in the support are 2 and 10 wt %, respectively. DBT conversion of Ti−La catalysts was slightly higher than Ti−Ce catalysts, and both showed maximum values of conversion at 50 and 75% of the amount of metals in commercial catalysts.

The objective of this work is to study the experimental synthesis of Co-Mo catalysts supported on Ti-MCM-41/alumina. The mixing process of alumina and Ti-MCM 41 and the resulting effects on mechanical and textural properties of the final catalyst were studied. MCM-41 was synthesized according to methods previously reported in the literature. An alumina matrix was obtained from the thermal treatment of pseudo-boehmite. Cylindrical extrudate support was prepared by physical mixture of Ti-MCM-41 and boehmite. Co and Mo were incorporated into the support by simultaneous impregnation. The catalysts were characterized by textural properties, X-ray diffraction (XRD), and scanning electron microscopy (SEM). Catalytic activity tests were conducted in a differential reactor using the hydrodesulfurization (HDS) of dibenzothiophene (DBT) as the model reaction. Reaction products were analyzed via online gas chromatography (GC). The integration of Ti-MCM-41 with alumina resulted in a support with suitable textural and mechanical properties, such as those required for commercial application. The results of HDS of DBT indicated that Co-Mo supported on Ti-MCM-41/alumina catalyst exhibits activity that is very similar, in comparison, to that of a typical commercial catalyst.

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