Process for the production of hydrogen by the thermochemical route, based on the hydrochlorination of cerium

US7658904B2 · kind B2 · utility

Assignee

• COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR

Inventors

• Roger Boen · Pont-Saint-Esprit, FR
• Christophe Girold · Piolenc, FR
• Florent Lemort · Villeneuve-lès-Avignon, FR
• Vlatko Materic · Wellington, NZ

Key dates

• Filing date: Dec 20, 2005
• Grant date: Feb 9, 2010
• Expiry date: Dec 20, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E60/36
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Process for the production of hydrogen by the thermochemical route from water, based on the chlorine/cerium cycle, in which, according to a first reaction scheme, the following reactions are carried out:H2O+Cl2=2HCl+½O2;  (A)8HCl+2CeO2=2CeCl3+Cl2+4H2O;  (B)2CeCl3+4H2O=2CeO2+6HCl+H2;  (C)or in which, according to a second reaction scheme, the following reactions are carried out:H2O+Cl2=2HCl+½O2;  (A)8HCl+2CeO2=2CeCl3+Cl2+4H2O;  (B)2CeCl3+2H2O=2CeOCl+4HCl;  (B′)2CeOCl+2H2O=2CeO2+2HCl+H2;  (C′)and in which the reaction (B) for the chlorination of cerium oxide is carried out in the liquid phase, the cerium chloride passing into solution.