Influence of cryogenic conditions of molybdenite dispersion on the activity of massive sulfide catalysts based on it

Single-component nanoscale moly powders (NP) prepared under cryogenic conditions (77 K) in various gaseous media, as well as two-component composites based on moly (MoS2), in combination with gas-phase cobalt (Co) and nickel (Ni) nanopowders, both with and without catalytic promoters, have been studied. To obtain a new series of samples, mono-molybdenum disulfide of a layered structure was subjected to fine grinding in cryogenic media of various chemical compositions, in combination with or without gas-phase NP Co and Ni. The dispersion, porosity, and catalytic activity in the hydrodesulfurization reactions of dibenzothiophene (DBT), as well as diesel fractions (DF), were determined for cryo-NP samples. The most active catalysts identified during the experiments were used in the process of hydrotreating components of diesel fractions. The "aromatizing" and "hydrogenating" abilities of the tested catalyst samples were evaluated. It is shown that using the cryogenic approach makes it possible to obtain new cryocatalysts with a high level of hydrodesulfurization ability of both model S-, N-compounds and components of native raw materials. Possible relationships between the specific characteristics that were determined during the studies of the prepared cryo-samples and their catalytic activity are discussed. It has been shown that cryo-catalysts based on a mono-molybdenum disulfide layered structure with a micro and mesoporous structure are characterized by higher activity and stability in the hydrodesulfurization reactions of DBT and diesel fractions. The authors declare no conflicts of interests.

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