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Improving hydrogen yields, and hydrogen: Steam ratio in the chemical looping production of hydrogen using Ca<inf>2</inf>Fe<inf>2</inf>O<inf>5</inf>

Chan, MSC and Liu, W and Ismail, M and Yang, Y and Scott, SA and Dennis, JS (2016) Improving hydrogen yields, and hydrogen: Steam ratio in the chemical looping production of hydrogen using Ca<inf>2</inf>Fe<inf>2</inf>O<inf>5</inf>. Chemical Engineering Journal, 296. pp. 406-411. ISSN 1385-8947

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Abstract

© 2016 The Authors. A thermodynamic property of Ca 2 Fe 2 O 5 was exploited to improve the efficiency of the steam-iron process to produce hydrogen. The ability of reduced Ca 2 Fe 2 O 5 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 Ca 2 Fe 2 O 5 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 Ca 2 Fe 2 O 5 , the full oxidation from Fe(0) to Fe(III) can be utilised for hydrogen production - an improvement from the Fe to Fe 3 O 4 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.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:11
Last Modified: 21 Nov 2017 03:51
DOI: