l. J ~ 1 Mexican Congress on Chemieal Reaction Engineering (MCCRE 2008)

Different alumina-titania and alumina-zeolite supported catalysts were evaluated for hydrodesulfurization of dibenzotiophene (DBT) in a batch reactor at 340°C, 4 MPa of hydrogen pressure and 700 rpm of stirring rate. The influence of the support preparation and the composition in the conversion of DBT was estimated for Ah03-Ti02 and Ah03-zeolite CoMo supported catalysts. The effect of support composition on HDS and its reaction product selectivities are the content of the full manuscript. 1. Introduetion Hydrotreating is an important process for upgrading petroleum by removing heteroelements such as metals and sulfur. However, the problem that refiners face nowadays is the increasingly production of heavy crudes by which it is nccessary to increase the operating conditions or change the catalysts/supports properties. Regarding to this, mixed oxides are useful to reach this goal [1]. In the case of the incorporation of Ti02 to alumina good results have been obtained with model molecules but problems are associated to this support due to its low SSA and pore volume. To improve the heavy and extra heavy crudes it is necessary to increase the acidity of the support by using zeolites which improve the activity towards eracking favoring the selectivity to ligh