Solar Rotary Reactor for Continuous H2 Production Using Two-(2)

produce solar hydrogen. The high temperatures of the oxygen releasing reaction with MO systems form a barrier to integration of a two-step water splitting cycle and construction of a solar concentrating system for hydrogen production. The redox materials with MxFe3-xO4 (M = Mn, Co, Ni, Zn) have been investigated to lower the temperature of the oxygen releasing reaction.7-12 In the case of x = 1, MFe2O4 (M = Ni, Zn) is also possible to lower the temperature of the oxygen releasing reaction, the oxygen releasing reaction proceeds at 1800K under an air flow with both Zn ferrite (ZnFe2O4) and Ni ferrite (NiFe2O4) systems.13,14 Moreover, CeO2-MOx (M = Mn, Fe, Ni, Cu) solid solution has been prepared for lowering the temperatures of the oxygen releasing reaction and preventing from sintering of the material in the oxygen releasing reaction.15 The various types of solar furnace have been introduced as an efficient thermo/chemical energy conversion device to produce solar hydrogen. The two-step water splitting process has been carried out in a single solar energy converter.16 The metal oxide redox systems such as mixed iron oxides coated upon 1/6WHEC 16 / 13-16 June 2006 – Lyon France multi-channeled honeycomb ceramic which supports capable of absorbing solar irradiation were utilized in the whole process. The gaseous products of oxygen and hydrogen are obtained alternately in the cyclic twostep water splitting process with the solar furnace having a single reaction cell. A solar chemical reactor for conducting the thermal dissociation of ZnO into zinc and oxygen at above 2000K has been developed for the following hydrogen generation reaction.17 With the reactor configuration, ZnO is directly exposed to high-flux solar irradiation and serves simultaneously the functions of radiant absorber, thermal insulator, and chemical reactant. The hydrolyser is necessary for achievement of the water-splitting solar thermochemical cycle, separately.18,19 We develop and fabricate the solar furnace with cylindrical rotor coated by reactive ceramics and two different type reaction cells, one is for oxygen releasing reaction and the other is for hydrogen generation reaction.1-4 The evolutions of oxygen and hydrogen in the two-step water splitting cycle can be effected simultaneously and continuously in the oxygen releasing reaction cell and hydrogen generation cell of the rotary-type solar furnace, respectively. A conceptual outline of the rotary-type solar furnace is illustrated in Fig.1. The cylindrical rotor coated with reactive ceramics is mounted in the middle of two reaction cells and turned around between the oxygen releasing Reduced reactive and hydrogen generation reaction cells Oxygen ceramics alternately. The reactive ceramics reduced releasing in the oxygen releasing reaction cell can reaction cell continuously split water and produce O2 hydrogen with the oxidation in the hydrogen H O 2 generation reaction cell where steam is flowing. The aim of this stu

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