Effect of the hydrogen spillover on the selectivity of dibenzothiophene hydrodesulfurization over CoS_x/gamma-Al_2O_3,NiS_x/gamma-Al_2O_3 and MoS2_/gamma-Al_2O_3 catalysts

摘要

Dibenzothiophene (DBT) hydrodesulphurization (HDS) reaction at 3 MPa and 325-375 deg C on Mo/gamma-Al_2O_3 single-bed and Me/y-Al_2O_3//SiO_2//MO/gamma-Al_2O_3 (Me=Co or Ni) double-bed catalysts were investigated.Results indicate that ratio cyclohexylbenzene (CHB)/biphenyl (BP) or selectivity is higher when using double-beds rather than a single-bed.Synergy in dibenzothiophene hydrodesulphurization on Co//Mo and Ni//Mo double-beds is also detected.Changes in selectivity and conversion are attributed to the action of spillover hydrogen (Hso) formed in the first bed that reaches the second bed.