Abstract
Physical and chemical degradation of the oxygen-carrier materials during high-temperature redox exposures may affect the overall efficiency of the chemical looping process. Therefore, studying real-time physical and chemical changes in these materials when exposed to repeated redox cycles is essential for further development of chemical looping technology. In this work, the National Energy Technology Laboratory’s Al2O3-supported Cu/Fe spinel oxygen carrier, in the form of a CuO · Fe2O3 solid solution, was examined in situ during 3-h exposures to either oxidizing or reducing environments at 800 °C using a controlled atmosphere heating chamber in conjunction with a confocal scanning laser microscope. A compilation of the physical changes of individual particles using a controlled atmosphere confocal microscope and the microstructural/chemical changes documented using a scanning electron microscope will be discussed.
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Acknowledgements
This work was performed in support of the US Department of Energy’s Fossil Energy Advanced Combustion Program. The research was executed through NETL Research and Innovation Center’s Advanced Combustion effort. Research performed by AECOM Staff was conducted under the RES contract DE-FE-0004000. The authors wish to thank Mr. Matt Fortner for metallography.
Figure 1 reprinted with permission from Nealley et al.: Springer, JOM, Structural changes and material transport in Al2O3-supported Cu/Fe spinel particles in a simulated chemical looping combustion environment, Nealley WHH, Nakano A, Nakano J, Bennett JP, Copyright (2018).
The authors declare that they have no competing financial interest.
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Nealley, W.H.H., Nakano, A., Nakano, J., Bennett, J.P. (2019). In Situ Structural Variations of Individual Particles of an Al2O3-Supported Cu/Fe Spinel Oxygen Carrier During High-Temperature Oxidation and Reduction. In: Nakano, J., et al. Advanced Real Time Imaging II. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-06143-2_3
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DOI: https://doi.org/10.1007/978-3-030-06143-2_3
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