Solar Rotary Reactor for Continuous H2 Production Using Two-(6)

pe solar furnace with Ni,Mn-ferrite at the estimated temperatures of 1473 and 1073 K, respectively. The cylindrical rotor was rotated 180 degrees every 10 min between the oxygen releasing reaction cell and the hydrogen generation reaction cell. In case of a steam with an Ar carrier gas was passed through the hydrogen reaction cell continuously, the evolution of oxygen was observed every 10 min (Fig.6 (a)). In the hydrogen generation reaction cell without steam flow, the oxygen releasing reaction didn’t proceed (Fig.6 (b)). It was indicated that the two-step water splitting reaction with the rotary-type solar furnace was repeatedly accomplished. The dependence of hydrogen generation temperature for the reproduction of oxidized reactive ceramics in the two-step water splitting process with Ni,Mn-ferrite was investigated to reveal the optimum temperature ofTemperature (K) (K)Intensity (a.u.)4/6WHEC 16 / 13-16 June 2006 – Lyon France the hydrogen generation reaction using the rotary-type solar furnace. The oxygen releasing reaction and the hydrogen generation reaction were carried out at the estimated temperatures of around 1473 and 873-1073 K, respectively. The cylindrical rotor was rotated 180 degrees every 10 min. The peaks of oxygen evolved in the oxygen releasing reaction cell were observed as the cylindrical rotor turned around at the estimated temperature of 1073 K in the hydrogen generation reaction cell. On the other hand, the hydrogen generation reaction with Ni,Mn-ferrite didn’t proceed at the estimated temperature of 873 K in the hydrogen generation reaction cell. The amounts of oxygen evolved in the oxygen reaction cell increased with an increase in the reaction temperature of hydrogen generation reaction proceeding in the other cell (Fig.7). The optimum estimated temperature for the hydrogen generation reaction with Ni,Mn-ferrite was 1073 K with the rotarytype solar furnace in the temperature range between 873 K and 1073 K.Rotation of 180 degrees Intensity (a.u.)Rotation of 180 degreesIntensity (a.u.)(c)(a)(b)(b)(a)5101520 Time (min)2530350102030405060Time (min)Fig.6 O2 generation profile observed by mass spectrometry in the oxygen releasing reaction cell, (a) steam on and (b) steam off.Fig.7 O2 generation profile observed by mass spectrometry in the oxygen releasing reaction cell at the temperatures of 1073, 973 and 873 K for the hydrogen generation reaction.The two-step water splitting cycle with Ni,Mn-ferrite was repeated at different Rotation of (c) temperature of the hydrogen generation 180 degrees reaction on the rotation of the cylindrical rotor at 180 degrees every 10 min in order to confirm the hydrogen generation reaction using the rotary-type solar furnace. The oxygen releasing reactions were carried out at (b) the estimated temperatures of around 1473 K, and the hydrogen generation reactions were performed at the estimated temperatures of (a) 1073, 1123 and 1173

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