Collect. Czech. Chem. Commun. 1987, 52, 1748-1757

Bimetallic sulphide catalysts Ni-M-Sx/SiO2 prepared by unconventional method involving thiourea complexes

Eva Hillerová, Jiří Sedláček and Miroslav Zdražil

Institute of Chemical Process Fundamentals, Czechoslovak Academy of Sciences, 165 02 Prague 6-Suchdol


An unconventional method of preparation of hydrodesulphurization catalysts was tested. A series of M-Sx/SiO2 and Ni-M-Sx/SiO2 catalysts was prepared, where M was V, Cr, Mn, Mo, W or Nb, respectively. A mixture of a salt of the metal M, thiourea, glycerol, sulphur, isopropanol, and silica gel was thermally decomposed to obtain the M-Sx/SiO2 catalysts. Nickel was deposited from solution of nickel acetate in methanol. Activity of catalysts was tested in benzothiophene hydrodesulphurization and their surface composition was characterized by XPS. The activity of samples containing Ni-Mo and Ni-W was in the rank of classical Co-Mo/Al2O3 catalysts but other samples exhibited only low activity and no synergism. The increase in binding energy of Ni after mixing with second metal M was observed not only for Mo and W but also for V, Cr, and Mn. It is concluded that this shift is probably not the main cause of synergism as suggested in the literature.