RefDoc
Haut

Faire une nouvelle recherche
Make a new search
Lancer la recherche


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 H2 production based on CeO2/Ce2O3 oxides has been successfully demonstrated. It consists of two chemical steps: (1) reduction, 2CeO2 → Ce2O3 + 0.502; (2) hydrolysis, Ce2O3 + H2O → 2CeO2 + H2. 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, CO2), 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, no12, pp. 1611-1623 [13 page(s) (article)] (1 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Kidlington, ROYAUME-UNI  (1958) (Revue)

Mots-clés anglais / English Keywords

Solar furnace

;

Kinetics

;

Fixed bed reactor

;

Operating conditions

;

Feasibility

;

Controlled atmosphere

;

Hydrolysis

;

Chemical reduction

;

Thermochemical cycle

;

Cerium oxide

;

Hydrogen production

;

Mots-clés français / French Keywords

Four solaire

;

Cinétique

;

Réacteur lit fixe

;

Condition opératoire

;

Faisabilité

;

Atmosphère contrôlée

;

Hydrolyse

;

Réduction chimique

;

Cycle thermochimique

;

Cérium oxyde

;

Production hydrogène

;

Mots-clés espagnols / Spanish Keywords

Horno solar

;

Cinética

;

Reactor lecho fijo

;

Condición operatoria

;

Practicabilidad

;

Atmósfera controlada

;

Hidrólisis

;

Reducción química

;

Ciclo termoquímico

;

Cerio óxido

;

Mots-clés d'auteur / Author Keywords

Solar energy

;

Hydrogen

;

Water-splitting

;

Thermochemical cycle

;

Cerium oxide

;

Localisation / Location

INIST-CNRS, Cote INIST : 8338 A, 35400014514682.0090

Nº notice refdoc (ud4) : 18357022



Faire une nouvelle recherche
Make a new search
Lancer la recherche
Bas