Improving hydrogen yields, and hydrogen:steam ratio in the chemical looping production of hydrogen using Ca2Fe2O5Report as inadecuate


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


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Publication Date: 2016-04-01

Journal Title: Chemical Engineering Journal

Publisher: Elsevier

Volume: 296

Pages: 406-411

Language: English

Type: Article

Metadata: Show full item record

Citation: Chan, M. S. C., Liu, W., Ismail, M., Yang, Y., Scott, S. A., & Dennis, J. S. (2016). Improving hydrogen yields, and hydrogen:steam ratio in the chemical looping production of hydrogen using Ca2Fe2O5. Chemical Engineering Journal, 296 406-411. https://doi.org/10.1016/j.cej.2016.03.132

Description: This is the final version of the article. It first appeared from Elsevier via http://dx.doi.org/10.1016/j.cej.2016.03.132

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.

Keywords: chemical looping, hydrogen, iron oxide, thermodynamics, packed bed

Sponsorship: Dr Matthew T. Dunstan is acknowledged for help with the XRD analysis. M.S.C.C acknowledges financial support from an EPSRC Doctoral Training Grant. W.L and Y.Y acknowledge funding from the National Research Foundation (NRF), Prime Minister’s Office, Singapore under its Campus for Research Excellence and Technological Enterprise (CREATE) programme.

Identifiers:

External DOI: https://doi.org/10.1016/j.cej.2016.03.132

This record's URL: https://www.repository.cam.ac.uk/handle/1810/254930



Rights: Attribution 2.0 UK: England & Wales

Licence URL: http://creativecommons.org/licenses/by/2.0/uk/





Author: Chan, Martin S. C.Liu, WenIsmail, MohammadYang, YanhuiScott, Stuart A.Dennis, John S.

Source: https://www.repository.cam.ac.uk/handle/1810/254930



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