Effect of metal oxides concentration over supported cordierite monoliths on the partial oxidation of ethanol

The effect of metal oxide concentration supported over monoliths was studied on the partial oxidation of ethanol. Nano-structured Co3O4, NiO and CuO oxide catalysts were prepared by means of polymerization-combustion technique using citric acid as chelating agent and washcoated over cordierite monoliths, which after combustion process were calcined and tested under isothermal conditions. X-ray diffraction (XRD) and high resolution transmission electronic microscopy (TEM) showed nanostructure and stable crystallite materials. These metal oxides were tested in the partial oxidation reaction, showing that metal oxide concentration influences the product distribution and selectivity. The maximum concentration for all samples was 12% of corresponding metal oxide (MeO), resulting in high conversions and H-2 selectivity. Diffuse reflectance infrared Fourier transform spectroscopy of adsorbed ethanol (DRIFTS-EtOH) and TPD desorption of ethanol showed the formation of intermediate ethoxy-species and preferential dehydrogenation reaction. (C) 2013 Elsevier B.V. All rights reserved.