In the present study, we examine the dominant chemical reactions and the optimal conditions, assuming the design of ethanol-steam-reforming reactors. Experiments are performed for two catalysts, 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 T, which suggests that the Cu/ZnO/Al 2 O 3 catalyst promotes the ethanol-steam-reforming and the water-gas shift reactions, but does not promote the methanation reaction. On the other hand, high-reaction-temperature-type catalysts, such as Ru/Al 2 O 3 , promote all the three at high T. Furthermore, we specify the effect of the steam-carbon molar ratio S/C on the hydrogen concentration C H2 and the effect of T on C H2 for each catalyst.

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Our aim is to reveal the optimum conditions for the design of ethanol steam − reforming reactors ． Experiments are carried out using two types of catalysts ； namely ， Cu〆 ZnO ／ Al203 and Ru 〆 Al203． Using a plant ・ scale reactor with we11 − controlled thermal djstributions ， we specify the effect of steam − c田 bon molar r飢 io on the hy〔 irogen concentration CH2 ， and the effect ofthe reaction temperature T on CH2 ， fbr each catalyst ， and we compare such results with Ghemicai − equilibrium theory ． Obtained results are as fol 且 ows ． T卜e Ru catalyst shows better performance than the Cu1ZnO catalyst ． On the other hand ， the Cu ／ ZnO catalyst shows rather high perfomlancc at much lower T Specifically speaking ， under the condition of

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