Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/164396
Title: Modulating lattice oxygen activity of Ca₂Fe₂O₅ brownmillerite for the co-production of syngas and high purity hydrogen via chemical looping steam reforming of toluene
Authors: Xu, Tingting
Wang, Xun
Zhao, Haibo
Xiao, Bo
Liu, Dong
Liu, Wen
Keywords: Engineering::Chemical engineering
Issue Date: 2023
Source: Xu, T., Wang, X., Zhao, H., Xiao, B., Liu, D. & Liu, W. (2023). Modulating lattice oxygen activity of Ca₂Fe₂O₅ brownmillerite for the co-production of syngas and high purity hydrogen via chemical looping steam reforming of toluene. Applied Catalysis B: Environmental, 320, 122010-. https://dx.doi.org/10.1016/j.apcatb.2022.122010
Journal: Applied Catalysis B: Environmental 
Abstract: The chemical looping steam reforming (CLSR) of biomass tar enables the process intensification for the co-preparation of syngas and high purity hydrogen. The practical application of brownmillerite-structured Ca2Fe2O5 is hindered by activity-related issues such as low fuel conversion and oxygen transfer capacity. Here, the doping of heteroatoms, e.g. Ni induces structural changes to the brownmillerite lattice, transforming it from a Pnma phase to a Pcmn one, with increased distortion of the FeO6 octahedra. The structural changes lead to the upwards shifts of the O 2p band of oxygen carrier, and subsequently improved lattice oxygen activity as well as oxygen transfer capacity. The formation of oxygen vacancy is a rate determining step during CLSR, while the Ni-doped Ca2Fe2O5 reduces the energy of oxygen vacancy formation and energy barrier for lattice oxygen migration through the bulk. During CLSR, Ca2Ni0.25Fe1.75O5 lead to significant improvement in syngas productivity, hydrogen purity and fuel conversion.
URI: https://hdl.handle.net/10356/164396
ISSN: 0926-3373
DOI: 10.1016/j.apcatb.2022.122010
Schools: School of Chemical and Biomedical Engineering 
Organisations: Cambridge Centre for Advanced Research and Education 
Rights: © 2022 Elsevier B.V. All rights reserved. This paper was published in Applied Catalysis B: Environmental and is made available with permission of Elsevier B.V.
Fulltext Permission: embargo_20250207
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Journal Articles

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