Abstract

CASTANO, María H.; MOLINA, Rafael  and  MORENO, Sonia. Catalytic oxidation of toluene and 2-propanol over Mn and Co mixed oxides obtained by coprecipitation method. Rev.Colomb.Quim. [online]. 2013, vol.42, n.1, pp.64-85. ISSN 0120-2804.

Manganese and cobalt mixed oxides with M²⁺+Mg²⁺/M³⁺=3 y M²⁺/Mg²⁺=1 ratios were obtained by the coprecipitation method. The solids were characterized using X-ray diffraction (XRD), temperature-programmed reduction (H₂-TPR), N₂ adsorption and in the catalytic oxidation of two VOCs: toluene and 2-propanol. Manganese mixed oxide reached 100% conversion of the mixture of VOCs while cobalt mixed oxide did not achieve a complete oxidation. The catalyst Mn-Mg-Al showed the lowest temperature oxidation of toluene and 2-propanol in the mixture. The highest performance of the oxide catalyst Mn-Mg-Al is associated with the better redox potential in the manganese catalyst. Manganese mixed oxide was active in the oxidation of the single VOCs, where the scale of difficulty to oxidize the different organic compounds evaluated was: 2-propanol < toluene. The mixed oxide showed 100% conversion to CO₂ in the oxidation of toluene, while the 2-propanol was first oxidized to acetone. It suggests that there is an inhibitory effect on the oxidation of 2-propanol in the mixture of VOCs.

Keywords : coprecipitation; mixed oxides; volatile organic compounds; VOCs.

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