Kinetic Modelling of the Influence of H₂S on Dibenzothiophene Hydrodesulfurization in a Batch System over Nano-MoS₂  

作　　者：Hamdy Farag Abdel-Nasser A. El-Hendawy Masahiro Kishida Hamdy Farag;Abdel-Nasser A. El-Hendawy;Masahiro Kishida(Department of Material Process Engineering, Graduate School of Engineering, Kyushu University, Fukuoka, Japan;Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt;Physical Chemistry Department, National Research Center, Cairo, Egypt)

机构地区：[1]Department of Material Process Engineering, Graduate School of Engineering, Kyushu University, Fukuoka, Japan [2]Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt [3]Physical Chemistry Department, National Research Center, Cairo, Egypt

出　　处：《Advances in Chemical Engineering and Science》2020年第3期135-148,共14页化学工程与科学期刊（英文）

摘　　要：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 <i>in situ</i>, 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.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 <i>in situ</i>, 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.

关 键 词：Hydrodesulfurization MoS₂ Kinetics Model AUTOCATALYSIS DIBENZOTHIOPHENE 

分 类 号：O64[理学—物理化学]