CoMoW / Al2O3-MgO-Li2O Catalytic formulations for DBT hydrodesulphurization

Abstract

Low acidity catalytic formulations were prepared incorporating MgO and Li₂O to the conventional CoMoW / Al₂O₃ catalysts. The CoMoW active phases were impregnates using an ammoniacal solution containing the metallic complexes as citrates. A high dispersion of the Co, Mo and W species in octahedral coordination, inhibiting the agglomeration towards phase like MoO₃, WO3 and Co₃O₄, was attained. The obtained formulations preserve the catalytic activity in the hydrodesulphurization (HDS) reaction of dibenzothiphene (DBT), enhancing the selectivity towards the direct desulphurization route. The prepared formulations show a lower hydrogenation function due to its low acidity.