Abstract
Sulphided Co–Mo catalysts prepared by supporting (CoL)2[Mo4(C6H5O7)2O11]·xH2O on γ-Al2O3 were studied. Pores with diameters less than 40 A in the catalysts preliminary dried at 120 °C were observed. The volume of these pores is proportional to the amount of carbon-containing decomposition products of the citrate ligands. No narrow pores in preliminary calcined catalysts were observed, whereas a sulphided active component was uniformly distributed in pores with diameters greater than 50 A, independent of the active-metal concentration. The morphology of the active component particles depends on the conditions of the heat pretreatment. Catalysts that contain particles with an average of 2.1 ± 0.2 layers in a stack and pores with diameters of 60–120 A are the most active in the hydrotreatment of diesel fuels.
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