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Title: Breaking the stoichiometric limit in oxygen-carrying capacity of Fe-based oxygen carriers for chemical looping combustion using the Mg-Fe-O solid solution system
Authors: Fan, Qianwenhao
Huang, Chuande
Xi, Shibo
Yan, Yong
Huang, Jijiang
Syed Saqline
Tao, Longgang
Dai, Yihu
Borgna, Armando
Wang, Xiaodong
Liu, Wen
Keywords: Engineering::Chemical engineering
Issue Date: 2022
Source: Fan, Q., Huang, C., Xi, S., Yan, Y., Huang, J., Syed Saqline, Tao, L., Dai, Y., Borgna, A., Wang, X. & Liu, W. (2022). Breaking the stoichiometric limit in oxygen-carrying capacity of Fe-based oxygen carriers for chemical looping combustion using the Mg-Fe-O solid solution system. ACS Sustainable Chemistry & Engineering, 10(22), 7242-7252.
Project: RT03/19 
Journal: ACS Sustainable Chemistry & Engineering 
Abstract: The performance of oxygen carriers contributes significantly to the efficiency of chemical looping combustion (CLC), an emerging carbon capture technology. Despite their low cost, Fe2O3-based oxygen carriers suffer from sintering-induced deactivation and low oxygen-carrying capacity (OCC) during CLC operations. Here, we report the development of a sintering-resistant MgO-doped Fe2O3oxygen carrier with an optimal composition of 5MgO·MgFe2O4, which exhibits superior cyclic stability and an OCC of 0.45 mol O/mol Fe (2.25 mmol O/gsolid), exceeding the widely accepted OCC limit of 0.167 mol O/mol Fe (2.08 mmol O/gsolid) of unmodified commercial Fe2O3. This result distinguishes this report from all past studies, in which efforts to enhance the cyclic stability of Fe-based oxygen carriers would always result in dilution of the OCC. The capacity enhancement by MgO is attributed to the unique mixtures of MgxFe1-xO (halite) and Mg1-yFe2+yO4(spinel) solid solutions, which effectively reduce the exergonicity for the reduction from Fe3+to Fe2+, while preventing any irreversible structural transformations during the redox process. This hypothesis-driven oxygen carrier design approach provides a new avenue for tailoring the lattice oxygen activities of oxygen carriers for chemical looping applications.
ISSN: 2168-0485
DOI: 10.1021/acssuschemeng.2c00271
DOI (Related Dataset): 10.21979/N9/WPBICK
Schools: School of Chemical and Biomedical Engineering 
Organisations: Cambridge Centre for Advanced Research and Education in Singapore (CARES) 
Research Centres: Nanyang Environment and Water Research Institute 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Sustainable Chemistry & Engineering, copyright © 2022 American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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