Author(s)

Hamdy Farag^1,2*, Abdel-Nasser A. El-Hendawy³, Masahiro Kishida¹

¹Department of Material Process Engineering, Graduate School of Engineering, Kyushu University, Fukuoka, Japan.
²Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
³Physical Chemistry Department, National Research Center, Cairo, Egypt.

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

Hydrodesulfurization, MoS₂, Kinetics, Model, Autocatalysis, Dibenzothiophene

Farag, H. , El-Hendawy, A. and Kishida, M. (2020) Kinetic Modelling of the Influence of H₂S on Dibenzothiophene Hydrodesulfurization in a Batch System over Nano-MoS₂. Advances in Chemical Engineering and Science, 10, 135-148. doi: 10.4236/aces.2020.103010.