The Silicon on the Catalysis: Hydrodesulfurization of Petroleum Fractions

Abstract

The use of silicon in hydrodesulfurization (HDS) catalysts has had an impact on some of the fundamental parameters for the performance of the HDS catalyst, such as dispersion of the active phase, the extent of sulfidation, or the level of promotion. Mesoporous silicates such as MCM-41, SBA-15, the modified surface of γ-alumina with silica, or mixed Al 2 O 3-SiO 2 support have showed to affect the metal-support interaction, favoring the so-called type II Co(Ni)-Mo(W)-S structures. The aim of this chapter is to elaborate an analysis on the recent advances in the synthesis design of silicon catalyst support for the hydrodesulfurization of petroleum fractions.

Constructing a superior Co–Mo HDS catalyst from a crystalline precursor separated from the impregnating solution

“…More stacking MoS 2 layers with shorter slabs can bring a higher HDS reactivity. [57][58][59] According to the discussion above, we can infer that the sulfidation occurs from the outside to the inside of the bulk crystalline Co 4 -Mo 12 , and the weak hydrogen bonds can bring about a lower sulfidation temperature. At 200 °C, MoS 2 is formed.…”