LAUSR

The effects of adding Co to a Ni/MgAl2O4 catalyst on activity and stability in the oxidative steam reforming of ethanol (OSRE) were investigated. The catalysts were prepared by impregnation and characterized by X-ray diffraction, N2 physisorption, temperature-programmed reduction, transmission electron microscopy, and X-ray absorption near edge structure (XANES). The major products formed during the OSRE reaction at 500 °C were H2, CO2, CO, and acetaldehyde, together with small amounts of CH4, ethylene, and acetone. The ethanol conversion was close to 100% with selectivity to H2 around 55% for 4Co4Ni catalyst, and no deactivation was observed on this catalyst during 28 h of reaction. The oxidation and reduction of Ni and Co catalysts during OSRE reaction were studied by XANES. Initial deactivation during the OSRE reaction occurred due to metal oxidation during heating, and the catalysts became reduced again as the reforming reaction proceeded during heating at temperatures higher than about 500 °C. Greate...