NiO/LaMnO₃ Catalysts for Steam Reforming of Ethanol

Perovskite type oxides supported nickel catalysts NiO/LaMnO3 were prepared by citric-complexing and impregnation method and used for H2 production by steam reforming of ethanol. The influence of nickel content and the calcination temperature on the catalytic performance was investigated. The catalysts were characterized by temperature programmed reduction (TPR), X-ray diffraction (XRD), and thermal analysis techniques. The catalysts showed very good catalytic performance. The NiO/LaMnO3 catalyst with NiO content of 15% (mass fraction, w) in catalysts and calcined at 700 exhibited the highest activity. Nearly 100% conversion of ethanol was observed over this catalyst at reaction temperature of 400 , in reaction mixtures of 20%(volume fraction, φ) C2H5OH+H2O and 80% (φ) N2 with a molar ratio of water and ethanol of 3:1 and at a gas hourly space velocity (QHSV) 80000 mL·h-1·g-1 cat. Bycombining catalytic performance and characterization results, it was proposed that the high activity was ascribed to the metal nickel reduced fromnickel ions in the lattice of perovskite type oxides.