Abstract
Nickel–manganese mixed oxides doped with 1, 3, 5mol% ytterbia have been prepared by co-precipitation method and used in the catalytic oxidation of benzyl alcohol. Catalytic activity of these oxides calcined at 400°C and 500°C was studied for selective oxidation of benzyl alcohol to the corresponding aldehyde using molecular oxygen as an oxidizing agent. The results showed that thermally stable 5mol% ytterbia doped nickel–manganese oxide [Yb2O3-(5%)-Ni6MnO8] exhibited highest catalytic performance when it was calcined at 400°C. A 100% conversion of the benzyl alcohol was achieved with >99% selectivity to benzaldehyde within a reaction period of 5h at 100°C. The mixed oxide prepared has been characterized by scanning election microscopy (SEM) and energy dispersive X-ray analysis (EDXA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), Brunauer–Emmett–Teller (BET) and temperature programed reduction (H2-TPR).
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