TITLE:
Kinetic Modelling of the Influence of H2S on Dibenzothiophene Hydrodesulfurization in a Batch System over Nano-MoS2
AUTHORS:
Hamdy Farag, Abdel-Nasser A. El-Hendawy, Masahiro Kishida
KEYWORDS:
Hydrodesulfurization, MoS2, Kinetics, Model, Autocatalysis, Dibenzothiophene
JOURNAL NAME:
Advances in Chemical Engineering and Science,
Vol.10 No.3,
June
3,
2020
ABSTRACT: 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.