Abstract
The effect of WOx over Ni-hydrotalcite catalysts to produce H2 by 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 H2 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 C 2H4. The catalysts did not produce CO.
Original language | English |
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Pages (from-to) | 157-163 |
Number of pages | 7 |
Journal | Journal of New Materials for Electrochemical Systems |
Volume | 15 |
Issue number | 3 |
DOIs | |
State | Published - 2012 |
Keywords
- Ethanol
- Hydrogen
- Hydrotalcite
- Ni