Reactive Working Material for Use in Hydrogen Production by Decompostion of Water

US20080089834A1Inactive Publication Date: 2008-04-17KROSAKI HARIMA CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
KROSAKI HARIMA CORP
Publication Date
2008-04-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

Disclosed is a reactive working material for use in a process of producing hydrogen by splitting water based on a two-step thermochemical water-splitting cycle through the utilization of solar heat, industrial waste heat or the like, which comprises a ferrite fine powder and a cubic zirconia supporting the ferrite fine powder. This reactive working material makes it possible to prevent scaling off of the ferrite fine powder from the zirconia fine powder due to volumetric changes of the ferrite fine powder during repeated use, and suppress growth of FeO grains due to repetition of melting and solidification when used as a reactive working material for a cyclic reaction under a high temperature of 1400° C. or more.
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Description

TECHNICAL FIELD

[0001] The present invention relates to a technique of producing hydrogen by splitting water through the utilization of solar heat, industrial waste heat or the like, and more particularly to a hydrogen production process based on a two-step thermochemical water-splitting cycle and a reactive working material for use in the hydrogen production process. BACKGROUND ART

[0002] A hydrogen production process based on a two-step thermochemical water-splitting cycle has been widely known before the filing of this patent application. The hydrogen production process is designed to repeat the following two reaction formulas. MOox→MOred+½O2   First Step MOred+H2O→MOox+H2   Second Step

[0003] Specifically, this hydrogen production process comprises a first step of reducing a metal oxide MOox to form a reduced metal oxide MOred and produce oxygen through a high-temperature thermal decomposition reaction, and a second step of reacting the reduced metal oxide with water to oxidize ...

Claims

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