Аннотация:A NiWS sulfide catalyst was generated in situ by decomposition of [(Met)3S]2Ni(WS4)2 as a precursor, and characterized by transmission electron microscopy and X-ray photoelectron spectroscopy. The obtained catalyst is active in hydrogenation of bicyclic aromatics. Heating and extending the reaction time were found to enhance the substrate conversion; the catalyst activity was further increased by adding a sulfiding agent. At a substrate/W molar ratio of 250/1, the conversion was 25% without the addition of the sulfiding agent. With the sulfiding agent it reached 65%