Abstract
Novel bulk single-component sulfide catalysts were prepared under the\t\t\t\t\tconditions of solid-phase dispersion of МoS2 molybdenite\t\t\t\t\tat various mechanical treatment times and various amounts of polar and nonpolar\t\t\t\t\tliquid microadditives. The chemical degradation of the samples in the air was\t\t\t\t\tfound to lead to the formation of surface sulfate anions that shield\t\t\t\t\tcatalytically active Mo sites. Indirect correlations of the hydrodesulfurization\t\t\t\t\tability of MoS2 powders with the concentration of sulfate\t\t\t\t\tanions on their surface, and with the aqueous pH in the powder suspensions,\t\t\t\t\tincluding the dielectric permittivity of the organic dopants, can serve as\t\t\t\t\treference indicators of high catalytic activity in the model reaction of\t\t\t\t\tdibenzothiophene hydrogenolysis. The study identified the most active sample\t\t\t\t\table to run for an extended time during multiple cycles without losing its\t\t\t\t\tcatalytic properties. Also, the paper discusses the dibenzothiophene conversion\t\t\t\t\troutes, the product composition, the probable structure of active sites in the\t\t\t\t\tcatalysts, and the desulfurization degree of diesel fuel components.
Highlights
The recent increasing trend in the hydrotreatment of petroleum fuels has been to search for approaches to creating novel oil refining catalysts [1]
Under the conditions of solid-phase mechanical activation of molybdenite in an inert atmosphere containing small amounts of polar/nonpolar liquids, novel unsupported bulk single-component sulfide catalysts with high hydrodesulfurization ability were prepared for the first time
It was demonstrated that trace amounts of polar and nonpolar liquid dopants can significantly affect the dispersion, surface chemical state, and catalytic activity of powders, all in accordance with the dielectric permittivity of the organic dopants
Summary
The recent increasing trend in the hydrotreatment of petroleum fuels has been to search for approaches to creating novel oil refining catalysts [1]. During mechanical activation (MA), the deformation and fracturing of large solid fragments is known to be significantly facilitated in liquid media with a high wetting energy. This is due to the forces of electrostatic interaction between liquid dipoles and ions on the crystal surface [3]. The temperature of dopant removal from the MoS2 samples (the dopant being represented by methanol or water) proved to exceed the boiling points of these dopants by 70–100°C This finding suggests that the dopants are chemically and structurally bound with molybdenite’s interlayer space. The data available from published reports on the structure and properties of such systems are insufficient
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