Effect Of Wox Over Ni/Hydrotalcite Catalysts To Produce Hydrogen From Ethanol

The effect of WOx over Ni-hydrotalcite catalysts to produce H-2 by ethanol steam reforming was studied. The catalysts were characterized by N(2)physisorption (BET area), X-ray diffraction, Infrared and UV-vis spectroscopies. The W concentration ranged from 0.5 to 3 wt% As W concentration increased, the intensity of XRD reflections of the Ni catalysts decreased. The porous structure of the materials consisted of parallel layers with a monomodal mesoporous distribution. The surface groups detected by IR were: -OH, Al-OH, Mg-OH, W=O and CO32-. UV-vis results suggested that Ni2+ ions were substituted by W ions. The catalytic evaluations were made in a fixed bed reactor using a water/ethanol mol ratio of 4 at 450 degrees C. Catalysts with low loadings of W (0.5 and I%) showed the highest H-2 production and stability..W promoted the conversion of ethanol towards hydrogen in the case of the Ni-hydrotalcite catalysts. The reaction products were; H-2, CO2, CH3CHO, CH4 and C2H4. The catalysts did not produce CO.