Titre du document / Document title
Thermochemical hydrogen production from a two-step solar-driven water-splitting cycle based on cerium oxides
Auteur(s) / Author(s)
ABANADES Stéphane (1) ;
FLAMANT Gilles (1) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Processes, Materials, and Solar Energy Laboratory, CNRS (PROMES-CNRS, UPR 8521), 7 Rue du Four Solaire, BP 5 Odeillo, 66120 Font-Romeu, FRANCE
Résumé / Abstract
A new thermochemical cycle for H
2 production based on CeO
2/Ce
2O
3 oxides has been successfully demonstrated. It consists of two chemical steps: (1) reduction, 2CeO
2 → Ce
2O
3 + 0.50
2; (2) hydrolysis, Ce
2O
3 + H
2O → 2CeO
2 + H
2. The thermal reduction of Ce(IV) to Ce(III) (endothermic step) is performed in a solar reactor featuring a controlled inert atmosphere. The feasibility of this first step has been demonstrated and the operating conditions have been defined (T= 2000 °C, P = 100-200 mbar). The hydrogen generation step (water-splitting with Ce(III) oxide) is studied in a fixed bed reactor and the reaction is complete with a fast kinetic in the studied temperature range 400-600 °C. The recovered Ce(IV) oxide is then recycled in first step. In this process, water is the only material input and heat is the only energy input. The only outputs are hydrogen and oxygen, and these two gases are obtained in different steps avoiding a high temperature energy consuming gas-phase separation. Furthermore, pure hydrogen is produced (it is not contaminated by carbon products like CO, CO
2), thus it can be used directly in fuel cells. The results have shown that the cerium oxide two-step thermochemical cycle is a promising process for hydrogen production.
Revue / Journal Title
Solar energy
ISSN
0038-092X
CODEN SRENA4
Source / Source
2006, vol. 80, n
o12, pp. 1611-1623 [13 page(s) (article)] (1 p.1/4)
Langue / Language
Anglais
Editeur / Publisher
Elsevier, Kidlington, ROYAUME-UNI
(1958)
(Revue)
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Localisation / Location
INIST-CNRS, Cote INIST : 8338 A, 35400014514682.0090
Nº notice refdoc (ud4) : 18357022
