Abstract. The rate constants of all reaction steps in the hydrodesulfurization (HDS) of dibenzothiophene (DBT), 4,6- dimethyldibenzothiophene (DMDBT), and their tetra- and hexahydro intermediates TH(DM)DBT and HH(DM)DBT over Ni–MoS2/y-Al2O3 were determined. DBT, THDBT, DMDBT, and THDMDBT underwent desulfurization by hydrogenolysis of both C–S bonds, while HHDBT and HHDMDBT underwent des…
Abstract. Two intermediates of dibenzothiophene (DBT)—tetrahydro-DBT (THDBT) and hexahydro-DBT (HHDBT)— were synthesized, and their hydrodesulfurization (HDS) mechanism was investigated over Mo/γ -Al2O3 at 300–340 ◦C and 5 MPa in the absence and presence of H2S and 2-methylpiperidine. The rate constants of all steps in the kinetic network of the HDS of DBT were measured. THDBT underwe…