The influence of MoS 2 slab 2D morphology and edge state on the properties of alumina-supported molybdenum sulfide catalysts

Effect of sulfidation pressure on the structure and activity of Ni(CyDTA)W/γ-Al2O3 hydrodesulfurization catalysts

“…more "rigid", with more stable S-M bonds. Such phenomenon has already been reported for MoS2 catalysts sulfided at different temperatures [24]. An increase of sulfidation pressure should lead to the same effect as an increase of temperature, since in both cases the chemical potential of sulfur is increased.…”

“…Therefore, the area marked with a rectangle will not be discussed further. Note that the maximum intensity of this high-temperature peak does not depend on chemistry but only on the total amount of WS2 of the studied sample [24]. Below 1000 K, three zones of H2S release can be distinguished (Fig.…”

Ultradispersed (Co)Mo catalysts with high hydrodesulfurization activity

“…The conclusions of previous works relating the catalytic activity to the TEM-observable shape and size of MoS2 particles should probably be revisited from this viewpoint. For example, strong variations in MoS2/Al2O3 HDS activity observed without a comparable evolution of the slabs size [36] could be explained by agglomeration of TEM-invisible ultradispersed species.…”

“…Among the existing strategies, the recently emerged concept of single-atom (SA) catalysis occupies an important observations could hardly be explained on the basis of this view. For example, the evolution of HDS activity vs. the preparation temperature could not be explained by only slight variations of slabs size and shape as observed by conventional TEM [36]. In several recent papers studying highly dispersed MoS2-based catalysts, clusters of several atoms or even single heavy atoms could be clearly seen in the STEM-HAADF images [31,33,37].…”

Influence of the support on the catalytic performance of Mo, CoMo, and NiMo catalysts supported on Al2O3 and TiO2 during the HDS of thiophene, dibenzothiophene, or 4,6-dimethyldibenzothiophene

“…Changes in the morphology and structure of the MoS 2 slabs in aluminasupported catalysts induced by the temperature of treatment have also an effect on the activity and selectivity. At high sulfidation temperatures (500-700 • C), well ordered MoS 2 particles display low desulfurization and hydrogenation activities as well as low DDS/HYD selectivity [22].…”