Pd–Pt catalysts on mesoporous SiO2–Al2O3 with superior activity for HDS of 4,6-dimethyldibenzothiophene: Effect of metal loading and support composition

Catalytic Activities of Noble Metal Phosphides for Hydrogenation and Hydrodesulfurization Reactions

“…On the other hand, the NiMoS catalyst exhibited the maximum HDS activity at 270 • C. In this catalyst, the selectivity of hydrogenated products, such as 3,3-methylcyclohexyltoluenes (MCHTs) and DMBCHs, decreased with increasing reaction temperature. It is well known that 4,6-DMDBT has high steric hindrance, which can be reduced by the hydrogenation of aromatic rings [5][6][7]. This indicates that higher reaction temperatures, which are thermodynamically unfavorable for hydrogenation reactions, should cause a decrease in the HDS activity of the NiMoS catalyst with low hydrogenation activity.…”

“…Heavy oil contains refractory organic sulfur compounds, such as 4,6-dimethyldibenzothiophene (4,6-DMDBT). It is well known that hydrogenation is an important method for the desulfurization of 4,6-DMDBT, because steric hindrance led by methyl groups can be decreased by hydrogenation of aromatic rings [5][6][7]. Thus, the petroleum industry claims that the development of highly active hydrodesulfurization (HDS) catalysts, which exhibit higher hydrogenating and HDS activities than commercial CoMo catalysts, will prevent air pollution, acid rain, and deactivation of exhaust gas treatment catalysts.…”

Ni2P clusters on zeolite nanosheet assemblies with high activity and good stability in the hydrodesulfurization of 4,6-dimethyldibenzothiophene

“…Therefore, the deep desulfurization of 4,6-DM-DBT requires catalysts with high hydrogenation activity [19,20]. It is well known that noble metal catalysts (Pd, Pt, and Pd-Pt) exhibit high hydrogenation activity [21], but they are sensitive to sulfur and expensive, which strongly limits their applications [22][23][24]. Metal phosphides (MoP, WP, and Ni 2 P) are a novel group of catalysts for deep hydrotreating [25][26][27].…”

The Silicon on the Catalysis: Hydrodesulfurization of Petroleum Fractions

“…This represents a challenge due to the declining trend of light oil supplies [6], leading to process heavy crudes with higher concentrations of sulfur, nitrogen, and metals. In this context, the hydrodesulphurization (HDS) is considered the most effective used process to produce ultralow sulfur transport fuels, for which the design and preparation of catalysts of high HDS performance are believed to be central factors [7,8]. In the last decade, traditional HDS catalysts have usually been based on Mo or W sulfides promoted by Co or Ni supported on γ-alumina [9,10].…”