Abstract
A thermodynamic property of Ca2Fe2O5 was exploited to improve the efficiency of the steam-iron process to produce hydrogen. The ability of reduced Ca2Fe2O5 to convert a higher fraction of steam to hydrogen than chemically unmodified Fe was demonstrated in a packed bed. At 1123 K, the use of Ca2Fe2O5 achieved an equilibrium conversion of steam to hydrogen of 75%, in agreement with predicted thermodynamics and substantially higher than that theoretically achievable by iron oxide, viz. 62%. Furthermore, in Ca2Fe2O5, the full oxidation from Fe(0) to Fe(III) can be utilised for hydrogen production - an improvement from the Fe to Fe3O4 transition for unmodified iron. Thermodynamic considerations demonstrated in this study allow for the rational design of oxygen carriers in the future. Modifications of reactors to capitalise on this new material are discussed.
Original language | English |
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Pages (from-to) | 406-411 |
Number of pages | 6 |
Journal | Chemical Engineering Journal |
Volume | 296 |
DOIs | |
Publication status | Published - Jul 15 2016 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2016 The Authors.
ASJC Scopus Subject Areas
- General Chemistry
- Environmental Chemistry
- General Chemical Engineering
- Industrial and Manufacturing Engineering
Keywords
- Chemical looping
- Hydrogen
- Iron oxide
- Packed bed
- Thermodynamics