Kinetic Modelling of the Influence of H<sub>2</sub>S on Dibenzothiophene Hydrodesulfurization in a Batch System over Nano-MoS<sub>2</sub>

• 作者: Abdel-Nasser A. El-Hendawy Hamdy Farag Masahiro Kishida
• 来源期刊: 化学工程与科学期刊(英文)
• 学科: 化学
• 关键词: HYDRODESULFURIZATION MoS₂ Kinetics Model AUTOCATALYSIS DIBENZOTHIOPHENE
• 年，卷（期）: 2020,（3）
• 页码范围: 135-148
• 页数: 14页
• 分类号: O64

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.