Solar Rotary Reactor for Continuous H2 Production Using Two-

WHEC 16 / 13-16 June 2006 – Lyon FranceSolar Rotary Reactor for Continuous H2 Production Using Two-Step Water Splitting ProcessH.Kaneko, T.Miura, H.Ishihara, T.Yokoyama, M.Chen and Y.Tamaura Research Center for Carbon Recycling and Energy, Tokyo Institute of Technology Ookayama 2-12-1, Meguro-ku, Tokyo, 152-8552, JAPAN, ytamaura@chem.titech.ac.jpABSTRACT: The rotary-type solar furnace was developed and fabricated for solar hydrogen production by a two-step water splitting reaction using the special reactive ceramic. The rotary-type solar furnace is the dual cell solar reactor, which has two different type reaction rooms, one is for oxygen releasing reaction and the other is for hydrogen generation reaction. The detailed specification and the efficiency of the rotary-type solar furnace were examined. The reactive ceramics mounted on the cylindrical rotor in the rotary-type solar furnace was heated up to ca. 1623K by a solar simulator. Successive evolutions of oxygen and hydrogen were observed in the oxygen releasing and water splitting reaction cells, respectively. Two-step water splitting process using newly developed rotary-type solar furnace was achieved. The optimum reaction temperatures of the oxygen releasing and hydrogen generation reactions with Ni,Mn-ferrite were 1473 K and 1173 K, respectively. KEYWORDS : Solar furnace, Rotary reactor, Concentrated solar heat, Two-step water splitting, Solar hydrogen production.1. Introduction The utilization of hydrogen energy as a clean energy greatly becomes important to solve global environmental problems, especially grovel warming caused by CO2 emission from fossil fuel combustion. Hydrogen can be produced by two-step water splitting with metal oxides as a redox pair in a thermochemical reaction. In the solar hydrogen production development with concentrated solar thermal energy, the key factor is to develop the solar reactor, in which solar hydrogen will be produced by a two-step water splitting reaction using the special reactive ceramics (reactive type at around 1473-1673K).1-4 The two-step water splitting cycle, which consists of the oxygen releasing reaction and hydrogen generation reaction, using metal oxides and thermo-chemical methods have been proposed on account of the lower reaction temperature than the direct water-splitting.5, 6 They can be represented as: Oxygen releasing step (1) MOox + thermal energy = MOred + 1/2O2(g) Hydrogen generation step MOred + H2O(g) = MOox + H2(g) (2) where MOox and MOred denote the oxidized and reduced states of metal oxide, respectively. Hydrogen and oxygen are obtained by repeating two steps alternately in the two-step water splitting cycle. Since the oxygen releasing step is an endothermic reaction, hydrogen obtained in Eq.(2) is solar hydrogen, 100% renewable energy, when thermal energy in Eq.(1) is supplied with the collector of concentrated solar heat. Two-step water splitting process is promising thermo/chemical energy conversion process to

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