Mechanochemical synthesis of β-NiMoO4 as a precursor of massive highly dispersed catalyst for hydrogenation processing of petroleum fractions

The possibility of massive catalysts synthesis using the mechanochemical activation (MCA), which is the basis for a non-waste technology of production of catalysts with particle sizes less than 10 microns is shown in the work. The predecessors of Ni-Mo catalysts for hydrogenation processes were synthesized by MCA. The chemical, phase composition and specific surface area of mechanically-activated composites with an atomic ratio of Ni: Mo = 1,0 and 1,4 were studied using the methods of DTA, XRD, TPR and low-temperature adsorption. It was established that during a joint MCA of salts containing Ni-and Mo-, solid-state reactions take place with the formation of complex X-ray amorphous compounds, which, after heating at 520 °С form nickel molybdates, which almost entirely composed of highly modified β-NiMoO4, sulfide which leads to the formation of phases MoS2, Ni3S2. There is comparative testing of sulfide catalysts – massive (Ni : Mo = 1,4), and commercial supported in the model conversion reactions of 1-methylnaphthalene and dibenzothiophene at 350 °C, 3,5 MPa pressure, mass flow rate of feed 2 h–1, the ratio of hydrogen/materials equal 600. The conclusion about the higher hydrogenating activity of the massive catalyst is made by composition of the conversion products of 1-methylnaphthalene and dibenzothiophene.

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