Novel Molybdenite-Based Nanopowder Catalysts for Hydrodesulfurization

Novel bulk single-component sulfide catalysts were prepared under the conditions of solid-phase dispersion of \MoS2 molybdenite at various mechanical treatment times and various amounts of polar and nonpolar liquid microadditives. The chemical degradation of the samples in the air was found to lead to the formation of surface sulfate anions that shield catalytically active Mo sites. Indirect correlations of the hydrodesulfurization ability of MoS2 powders with the concentration of sulfate anions on their surface, and with the aqueous pH in the powder suspensions, including the dielectric permittivity of the organic dopants, can serve as reference indicators of high catalytic activity in the model reaction of dibenzothiophene hydrogenolysis. The study identified the most active sample able to run for an extended time during multiple cycles without losing its catalytic properties. Also, the paper discusses the dibenzothiophene conversion routes, the product composition, the probable structure of active sites in the catalysts, and the desulfurization degree of diesel fuel components.

Automated summary

A study on novel bulk single-component sulfide catalysts synthesized by solid-phase dispersion of MoS2 molybdenite revealed that chemical degradation in the air leads to the formation of surface sulfate anions that shield catalytically active sites. The hydrodesulfurization ability of MoS2 powders showed indirect correlations with the concentration of sulfate anions on their surface, pH in powder suspensions, and dielectric permittivity of organic dopants, providing reference indicators for high catalytic activity. The most active sample was able to maintain its catalytic properties over multiple cycles, and the study also discussed dibenzothiophene conversion routes, product composition, active sites structures, and desulfurization degree of diesel fuel components.