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Research of the catalysts activity in the reactions of model compounds and their mutual influence was carried out. Quinoline is able to promote the hydrodesulfurization reaction of dibenzothiophene (DBT), being a source of hydrogen in the system at 260 °C. The possibility of intermolecular hydrogen transfer reactions in the reactions of tetrahydroquinoline and DBT is shown. [ABSTRACT FROM AUTHOR]

A series of catalysts have been synthesized Ni-Mo-W/P-Al2O3 with different Mo: W ratios (a sample without W, Mo: W = 2: 1, Mo: W = 1: 1, Mo: W = 1: 2, and a sample without Мо) and a concentration of P2O5 in a support of 0.5 wt %. Heteropoly acids H3PMo12O40 · nH2O and H3PW12O40 · nH2O and nickel citrate were precursors of the active phase. High-resolution transmission electron microscopy and X-ray photoelectron spectroscopy were used to study the surface of the sulfide phase of the samples. Their catalytic activity was estimated in the reactions of dibenzothiophene hydrodesulfurization and naphthalene hydrogenation. A catalyst with the ratio Mo: W = 1: 1 showed the highest activity, and was characterized by the maximum concentration of atomic groups Ni-Mo-W-S, Mo-S, and W-S. [ABSTRACT FROM AUTHOR]

A series of NiMoW/P-Al2O3 catalysts with different Mo/W ratios (sample containing Mo only, Mo/W = 2: 1, Mo/W = 1: 1, Mo/W = 1: 2, and sample containing W only; P2O5 content of the support 2.0 wt %) were synthesized. The precursors of the active phase were the heteropoly acids H3PMo12O40∙nH2O and H3PW12O40∙nH2O, and also nickel citrate. The sulfide phase in the samples was studied by high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy; the catalytic activity of the samples in dibenzothiophene hydrodesulfurization and naphthalene hydrogenation was determined. For the dibenzothiophene hydrogenolysis in the presence of quinoline and naphthalene (content in the model mixture, wt %: dibenzothiophene 0.3, naphthalene 1.5, and quinoline 0.5), kHDS for different samples is in the range 17.6-42.5 h-1 at 275°C and 24.6-45.9 h-1 at 300°C. For the naphthalene hydrogenation, kHYD varies from 0.79 to 1.89 h-1 at 275°C and from 0.91 to 3.78 h-1 at 300°C. The sample based on molybdenum showed the highest activity in hydrogenation and hydrodesulfurization. [ABSTRACT FROM AUTHOR]