Investigation of the Influence of H2S on Hydrodesulfurization of Dibenzothiophene over a Bulk MoS2 Catalyst

Bulk molybdenum sulfide catalyst was prepared by thermal decomposition of ammonium heptamolybdate at 800 °C in a flow of a 10% (v/v) H 2 S/H 2 gas mixture. Investigation of the catalytic activity of the grinding catalyst for hydrodesulfurization (HDS) of dibenzothiophene (DBT) was carried out in a batch magnetically stirring microautoclave reactor at 340 °C and 3 MPa H 2 . The influence of a wide range of H 2 S concentration on the catalytic activity was studied. A significant promoting effect on HDS of DBT by H 2 S was observed. The experimental results showed the great enhanced contribution from the hydrogenation route with H 2 S in HDS of DBT. However, severe inhibition by H 2 S against the direct desulfurization route was observed. Kinetic analysis leads to the individual reaction rate constant in the reaction scheme performed.