Abstract
The method of titanium incorporation was studied in TiO 2-Al 2O 3 mixed oxide supports synthesized by two methods: impregnation of boehmite and impregnation of alumina. The supports were impregnated with Ni and W and evaluated for the hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene (DMDBT). All the materials were characterized by nitrogen physisorption, Raman and UV–vis–DR spectroscopies. The results show that the method of impregnating the alumina surface with the titanium oxide precursor, allows obtaining supports with greater degree of surface polymerization of structures Ti O Ti and with higher semiconducting character in which a greater proportion of the most basic OH's is eliminated. These combined effects produced more active HDS catalysts.
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