In this work, the possibility of enhanced activity during the hydrodesulfurization\nof dibenzothiophene over certain nano-MoS2 catalyst due to the presence\nof H2S was examined by focusing on the reaction kinetics. With H2S generated\nin situ , the overall reaction followed the autocatalytic rate law; while in the\nabsence of H2S the kinetics indicated a pseudo-first-order reaction. H2S appears\nto modify the relative contributions of parallel hydrogenation and desulfurization\nreactions by drastically increasing the hydrogenation rate. Kinetic\nmodels were developed that describe the hydrodesulfurization reaction\nat various H2S concentrations, and the kinetic parameters and adsorption\nequilibrium constants associated with this process were estimated by fitting\nthe experimental data. The results suggest that the promotion and/or inhibition\nof hydrodesulfurization by H2S likely result from the same overall reaction\nmechanism.
Loading....