Thermochemical production of hydrogen and oxygen from water

Details Thermochemical production of hydrogen and oxygen from water Thermochemical production of hydrogen and oxygen from water

C - Chemistry, Metallurgy

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C01B 3/00 (2006.01) C01B 3/06 (2006.01) C01B 7/01 (2006.01) C01B 7/03 (2006.01) C01B 7/09 (2006.01) C01B 7/19 (2006.01) C01B 13/02 (2006.01) C01B 7/00 (2006.01)

Patent

CA 1068471

ABSTRACT OF THE INVENTION A process is disclosed which produces hydrogen and oxygen from water by means of a multi-step, closed, thermochemical cycle. Hydrogen and oxygen are produced at separate stations. Hydrogen and a halogen are produced by a sub-cycle involving transition metal or lanthanide compounds (depending on the halogen) and a hydrogen halide. Oxygen and the hydrogen halide are produced in a sub-cycle involving magnesium or transition metal compounds (depending on the halogen), the halogen and water. When the halogen is chlorine the transition metals in the oxygen producing sub-cycle can be nickel, cobalt, or yttrium and the lanthanide metals in the hydrogen producing sub-cycle can be samarium, europium, or ytterbium. When the halogen is bromine, the metals in the oxygen producing sub-cycle can be manganese or cobalt and the metals in the hydrogen producing sub-cycle can be vanadium or chromium.

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