Selective HDS of DBT using a K2O-modified CoMoW/Al2O3-MgO catalytic formulation

Abstract

Novel catalytic formulation CoMoW/Al2O3-MgO-K2O with low acidity and good selectivity towards direct desulfurization was obtained.It is observed that the addition of magnesia and potash to the catalytic support decreases the total number of acid sites determined through TPD of NH3. Supports were impregnated with a solution containing the metallic precursors of CoMoW as the respective citrates. From images obtained by TEM was made the statistical analyses of the stacking and slab length of MoS2 and WS2 crystallites, it was observed slabs larger and more stacked for the catalytic formulation containing K2O; their catalytic activity was evaluated through HDS of DBT to investigate their catalytic performance, and products such as BP, DCH and CHB were quantified to obtain selectivity through ratio of BP/CHB+DCH. Even when the catalytic formulation with low acidity shows a good selectivity the global activitydecreases.