The hydrodearomatization and hydrodesulfurization of the coking resin fraction (below 360A degrees C) in the presence of in situ synthesized Ni-W-S catalysts are studied using tungsten hexacarbonyl W(CO)(6) and nickel(II) 2-ethylhexanoate Ni(C7H15COO)(2) oil-soluble salts at a molar ratio of W: Ni = 1: 2 as precursors for the Ni-W-S catalysts. The resulting catalysts are characterized by transmission electron microscopy; the formation of agglomerates of nanoparticles with an average diameter of 100-200 nm is shown. The optimum temperature for the hydrotreating of the coking resin (380A degrees C) is determined.