Cobalt-Copper Oxide Catalysts for VOC Abatement: Effect of Co:Cu Ratio on Performance in Ethanol Oxidation

The effect of the Co-Cu oxide catalysts composition on their physicochemical properties and performance in deep oxidation ethanol was studied. with Co:Cu molar ratios 4:1, 1:1, 1:4 were obtained by calcination (4 h at 500 °C air) coprecipitated precursors characterized detail using powder XRD, Raman spectroscopy, N2 physisorption, H2-TPR, XPS. XRD spectroscopy indicated formation Co3O4 CuO mixtures rather than mixed oxides. promoted reduction; reduced more easily single-component Co Cu oxides main reduction maxima shifted to lower temperatures increasing cobalt content catalysts. catalyst a ratio 4:1 exhibited best gas-phase oxidation, showing lowest T50 (91 °C) T90(CO2) (159 needed for 50% conversion 90% CO2, respectively. excellent catalytic this ascribed synergistic components. high activity selectivity attributed presence finely dispersed particles surface Co3O4.