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

• Published in: Applied catalysis. B, Environmental Vol. 148-149; pp. 1 - 10
• Main Authors: Gómez-Cuaspud, J.A., Schmal, M.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 27.04.2014; Elsevier
• Subjects: Catalysis; CATALYSTS; Chemistry; COPPER OXIDE; Cordierite; Ethanol; Ethanol oxidation; ETHYL ALCOHOL; Exact sciences and technology; General and physical chemistry; Metal oxides; Metaloxides; MICROSTRUCTURES; Monoliths; Nanostructure; Oxidation; OXIDES; PARTIAL OXIDATION; Selectivity; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Ethanol oxidation; Monoliths; Metaloxides; Heterogeneous catalysis; Ethanol; Support; Alkanol; Alcohol; Cordierite; Oxides; Partial oxidation; Environmental protection
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2013.10.036

Hydrogen selectivity as function of the conversion for 12% catalyst at 420 and 650°C. •Effect of metal oxide content over Al2O3/monolith on the ethanol partial oxidation.•Syntheses of nanostructured Co3O4, NiO, CuO by polymerization combustion technique.•Maximum conversion and H2 selectivity obtained for 12% Co3O4/γ-Al2O3/monolith.•The 12% MeO content over γ-Al2O3/monolith catalysts exhibited excellent stability.•Comparison of conversion and selectivity at 420 and 650°C for optimum MeO content. 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 H2 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.