In the present study, we reveal the dominant chemical reactions and the optimum conditions, supposing the design of ethanol steam-reforming reactors. Experiments are conducted for two types of catalysts; namely, Cu/ZnO/Al 2 O 3 and Ru/Al 2 O 3 . Using a household-use-scale reactor with well-controlled temperature distributions, we compare experimental results with chemical-equilibrium theories. As a result, the Cu/ZnO/Al 2 O 3 catalyst shows rather high performance at low reaction temperature

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... This implies that the Cu/ZnO/Al 2 O 3 catalyst promotes the ethanol-steam-reforming and water-gas-shift reactions, but doesn't promote the methanation reaction. On the other hand, such high-reaction-temperature-type catalysts as Ru/Al 2 O 3 promote all the three. Furthermore, we specify the effect of steam-carbon molar ratio S/C on the hydrogen concentration C H2 , and the effect of T on C H2 , for each catalyst.