Abstract. The effect of oxygen mobility on the bio-ethanol steam reforming of ZrO2- and CeO2-supported cobalt catalysts was investigated. The supported catalysts were prepared by incipient wetness impregnation (IWI) and characterized through N2 physisorption, X-ray photoelectron spectroscopy, temperature programmed oxidation, laser Raman spectroscopy, diffuse reflectance infrared Fourier tr…