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The surface and catalytic properties of Co 3 O 4 /Al 2 O 3  solids treated with different proportions of MoO 3  were investigated, the extent of MoO 3  added varying between 0.50 mol% and 5.00 mol% (0.63–5.9 wt%). The pure sample was prepared by thermal decomposition at 600°C of aluminium hydroxide impregnated with a calculated amount of Co(NO 3 ) 2  dissolved in the least amount of distilled water. The MoO 3 -treated samples were prepared by thermal decomposition at 600°C of aluminium hydroxide treated with different proportions of ammonium molybdate followed by treatment with Co(NO 3 ) 2  solution.    The crystalline phases produced by thermal treatment of the pure and treated samples precalcined at 600°C were characterized using an XRD technique. The surface and catalytic properties of the various catalysts were studied using nitrogen adsorption at −196°C and CO oxidation by O 2  at 100–150°C.    The results obtained revealed that molybdena treatment of the Co 3 O 4 /Al 2 O 3  solids followed by precalcination at 600°C resulted in a decrease in the degree of crystallinity of the Co 3 O 4  phase produced. This treatment effected a progressive small increase in the specific surface area of the treated solids (ca. 10%). However, the catalytic activity was found to be increased considerably by increasing the amount of MoO 3  added (184%), reaching a maximum limit at 1.00 mol% MoO 3 .    The activation energies of the catalytic reaction calculated for both the pure and MoO 3 -treated solids suggested that MoO 3  treatment did not modify the energetic nature of the active sites (surface cobalt species) but increased their concentration.

Surface and Catalytic Properties of MoO3-Treated Co3O4/Al2O3 Solids

Surface and Catalytic Properties of MoO₃-Treated Co₃O₄/Al₂O₃ Solids