Abstract
Ethanol steam reforming over various catalysts was studied to identify the best conditions for selective CH4 production. In the sequence of catalyzed reactions, H2 production was followed by reduction of CO and CO2 to CH4. The compositions of the product gases obtained over Ru/CeO2 and Ru/SiO2 were close to the chemical equilibrium composition at 673 K. However, the product gas compositions obtained over Ru catalysts and Ru-based alloy catalysts were far from the chemical equilibrium composition at 623 K. Ethanol steam reforming by means of a two-stage catalytic process that involved ethanol CC bond cleavage over RuPt/SiO2 and Pd/Al2O3 in the first stage and reduction of CO and CO2 to CH4 over Ru/Al2O3 in the second stage was conducted at 623 K. The product gas compositions obtained over RuPt/SiO2+Ru/Al2O3 and Pd/Al2O3+Ru/Al2O3 were close to the chemical equilibrium composition at 623 K.
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