Effect of WOx Over Ni/Hydrotalcite Catalysts to Produce Hydrogen from Ethanol
OPEN ACCESS
The effect of WOx over Ni-hydrotalcite catalysts to produce H2by ethanol steam reforming was studied. The catalysts were characterized by N2 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°C. Catalysts with low loadings of W (0.5 and 1%) showed the highest H2production and stability. W promoted the conversion of ethanol towards hydrogen in the case of the Ni-hydrotalcite catalysts. The reaction products were; H2, CO2, CH3CHO, CH4 and C2H4. The catalysts did not produce CO.
Hydrogen, Ni, WOx, Hydrotalcite, Ethanol
The authors acknowledge the financial support of the Universi-dad Autónoma Metropolitana-Azcapotzalco and UAM-Iztapalapa and the Instituto Politécnico Nacional of México.
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