Influence of sulfiding agent and pressure on structure and performance of CoMo/Al2O3 hydrodesulfurization catalysts

Influence of H 2 O and H 2 S on the composition, activity, and stability of sulfided Mo, CoMo, and NiMo supported on MgAl 2 O 4 for hydrodeoxygenation of ethylene glycol

“…The transition of oxide to sulfide was followed in-situ with XANES and EXAFS (see Figure 9 and Figure 10). Similarly to what has been obtained in literature [89][90][91][92], the oxide precursor underwent transformation into intermediate oxy-sulfide species prior to conversion into the final sulfide form.…”

“…This may be explained by an interaction with the support resulting in the formation of highly dispersed, small particles as indicated by Raman. [56,90], but the CN = 0.26-0.43 is too low to obtain a precise estimate of the particle size (e.g. due to high temperature leading to a high Debye-Waller factor and small particle size due to mobility at > 300 °C), which is expected to be < 2 nm [93].…”

“…This is outside the scope of this paper, and it is the topic of further research. formation of the less active type I sulfide phases [56,90,96]. Type I sulfides are smaller particles with higher dispersion than type II sulfides that more resemble bulk MoS2 [100].…”

Efficient CoMoS Catalysts Supported on Bio‐Inspired Polymer Coated Alumina for Hydrotreating Reactions

“…They delay the sulfidation of the promoter with respect to the formation of MoS 2 and as a result, favour the insertion of Co or Ni in the edges of MoS 2 slabs ,. Yet, recent data indicate that this explanation may be too simplistic since it was shown that retarding the sulfidation of the promoter to temperatures where MoS 2 is already formed, is apparently not a sufficient condition for the formation of mixed sites . Moreover starting from organometallic or alkoxide compounds, a significant increase in the intrinsic activity has been observed, presumably because it modified the distribution of the promoter on the edges as compared to the classical method.…”

Paving the way towards green catalytic materials for green fuels: impact of chemical species on Mo-based catalysts for hydrodeoxygenation

“…Depending on the activation temperature, reaction time, pressure, and the support used, different mixtures of MoO 3 and MoS 2 are formed within the catalytic materials. 17,18 The inuence of the suldation process on the HDO of aromatics is very important for this type of catalysts. 19 The NiMo sulded catalysts supported on Al 2 O 3 have been tested in the HDO of triacylglycerides and were the best option among different supports to achieve complete deoxygenation mixture of hydrocarbons.…”