| 摘要 |
The present invention is related to a catalyst mainly used in the second stage of a process for hydrotreating residues and heavy crudes, mainly for performing a hydrodesulfurization reaction. The catalyst of the present invention comprises at least an hydrogenation metal from Group VIB in an oxide form, a promoter from Group VIII also in an oxide form that is deposited over a catalytically active inorganic mixed oxide, this promoter mainly including alumina in the gamma phase and titanium. The present invention provides two processes for the synthesis of the product: the first process is performed from a commercial bohemite, which is peptized with an inorganic acid, and subsequently extruded, calcined and impregnated with a solution containing titanium so as to obtain a titanium/alumina (TiO2/Al2O3) support; the second process includes a commercial bohemite mechanically mixed with a titanium solution, which is peptized with an inorganic acid, and subsequently extruded and calcined for obtaining the aforementioned titanium/alumina (TiO2/Al2O3) support, where the active phases and the promoter are deposited. The metallic oxides are converted into sulfurs so as to maintain the catalyst active. The activation is carried out by a process for hydrosulfuring oxides forming the catalyst. The catalysts synthesized by the aforesaid processes besides being useful for substantially improving the hydrodesulfurization activity, are not quickly deactivated due to the poisoning of the pollutants present in the heavy crude loads, mainly metals such as nickel and vanadium (Ni and V).
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