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Abstract <p>The study compares the catalytic performance of two Ni–Mo sulfide systems: a dispersed (unsupported) catalyst and one supported on MCM–41 ordered mesoporous silica. The catalytic performance was evaluated in the hydrotransformation of dibenzothiophene (DBT) using a batch reactor at temperatures of 340–380°C and a hydrogen pressure of 5 MPa for 0.5–10 h. For each catalyst, the apparent reaction rate constant and activation energy were calculated, and the effects of temperature and reaction time on product distribution and selectivity towards the hydrogenation reaction route and direct hydrodesulfurization pathway were determined. The primary products of DBT conversion were biphenyl and cyclohexylbenzene. The dispersed catalyst demonstrated a higher activity for the DBT conversion than its supported counterpart. Furthermore, for the dispersed catalyst, with increasing temperature and reaction time, the dibenzothiophene hydrogenation pathway becomes dominant over the hydrodesulfurization reaction route. In contrast, the MCM-41-supported sample maintained a consistent balance between the two pathways under all tested conditions.</p>

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Hydrotransformation of Dibenzothiophene over Dispersed and MCM-41-Supported Ni–Mo Sulfide Catalysts

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • M. Yu. Talanova,
  • Sijing Dai,
  • E. A. Maurina,
  • E. N. Maifet,
  • A. V. Vutolkina

摘要

Abstract

The study compares the catalytic performance of two Ni–Mo sulfide systems: a dispersed (unsupported) catalyst and one supported on MCM–41 ordered mesoporous silica. The catalytic performance was evaluated in the hydrotransformation of dibenzothiophene (DBT) using a batch reactor at temperatures of 340–380°C and a hydrogen pressure of 5 MPa for 0.5–10 h. For each catalyst, the apparent reaction rate constant and activation energy were calculated, and the effects of temperature and reaction time on product distribution and selectivity towards the hydrogenation reaction route and direct hydrodesulfurization pathway were determined. The primary products of DBT conversion were biphenyl and cyclohexylbenzene. The dispersed catalyst demonstrated a higher activity for the DBT conversion than its supported counterpart. Furthermore, for the dispersed catalyst, with increasing temperature and reaction time, the dibenzothiophene hydrogenation pathway becomes dominant over the hydrodesulfurization reaction route. In contrast, the MCM-41-supported sample maintained a consistent balance between the two pathways under all tested conditions.