Reaction pathways on NiMo/Al2O3 catalysts for hydrodesulfurization of diesel fuel

In order to be able to generalize the results, we included a CoMo catalyst in the study. The results at first sight are not fully consistent. Although this catalyst shows a low HG activity in HDS of DBT, it shows a relatively high activity in HDS of 4,6-DMDBT. Two reaction schemes were examined, one of them taking into account a dehydrogenation step. Although a dehydrogenation step could occur under our experimental conditions, the main cause of ranking differences is the differences of susceptibility for NiMo and CoMo catalysts to H2S.