Improving hydrogen yields, and hydrogen: Steam ratio in the chemical looping production of hydrogen using Ca2Fe2O5

Martin S.C. Chan*, Wen Liu, Mohammad Ismail, Yanhui Yang, Stuart A. Scott, John S. Dennis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

79 Citations (Scopus)

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 languageEnglish
Pages (from-to)406-411
Number of pages6
JournalChemical Engineering Journal
Volume296
DOIs
Publication statusPublished - Jul 15 2016
Externally publishedYes

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

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