Imperial College London
Alternate

Paul Fennell

Faculty of Engineering, Department of Chemical Engineering

Professor of Clean Energy
 
 
 
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Contact

 

+44 (0)20 7594 6637p.fennell

 
 
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Location

 

228aBone BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Patzschke:2021:10.1016/j.cej.2020.127093,
author = {Patzschke, CF and Boot-Handford, ME and Song, Q and Fennell, PS},
doi = {10.1016/j.cej.2020.127093},
journal = {Chemical Engineering Journal},
pages = {1--14},
title = {Co-precipitated Cu-Mn mixed metal oxides as oxygen carriers for chemical looping processes},
url = {http://dx.doi.org/10.1016/j.cej.2020.127093},
volume = {407},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Chemical looping with oxygen uncoupling (CLOU) and chemical looping air separation (CLAS) are novel and potentially promising processes for the combustion of solid fuels (e.g. biomass) for power generation with inherent CO2 capture. Redox-experiments at 850–950°C confirmed that copper manganese spinel oxides are promising oxygen carriers for these processes, as they combine a relatively high O2 release capacity and fast O2 release kinetics. Furthermore, this work presents a novel method to calculate the O2 partial pressure equilibrium and the heat of O2 release from observed rates of reaction. To demonstrate this method, oxygen carriers were prepared via mechanical mixing and co-precipitation with varying molar Cu:Mn ratios and synthesis conditions, thereby tuning material properties and the pore structure. The precursors and calcined materials were characterised, and the crystalline phases were determined using X-ray diffraction. The insights from the post cycling analysis of the oxygen carriers and the experimentally obtained O2 release capacities were combined to elucidate the redox-reactions relevant for the two processes. It was found that the presence of a higher partial pressure of O2 during the O2 release results in the formation of different (perovskite-like) phases than those occurring during the decomposition in an O2-free environment. The oxygen carriers demonstrated excellent stability at CLOU and CLAS process conditions during extended redox cycling (100 cycles in a thermo-gravimetric analyser and 50 cycles in a fluidised bed reactor), showing no significant loss of reactivity or O2 release capacity and a high resistance towards attrition and agglomeration. The degree of degradation after 100 cycles was in the order: temperature swing (CLAS)<O2 partial pressure swing (CLOU)<reduction with CH4 (chemical looping combustion).
AU  - Patzschke,CF
AU  - Boot-Handford,ME
AU  - Song,Q
AU  - Fennell,PS
DO  - 10.1016/j.cej.2020.127093
EP  - 14
PY  - 2021///
SN  - 1385-8947
SP  - 1
TI  - Co-precipitated Cu-Mn mixed metal oxides as oxygen carriers for chemical looping processes
T2  - Chemical Engineering Journal
UR  - http://dx.doi.org/10.1016/j.cej.2020.127093
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000607604900002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.sciencedirect.com/science/article/pii/S1385894720332216?via%3Dihub
VL  - 407
ER  -
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