In Situ Structural Variations of Individual Particles of an Al2O3-Supported Cu/Fe Spinel Oxygen Carrier During High-Temperature Oxidation and Reduction
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.
KeywordsChemical looping Fossil energy Oxygen carrier
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.
This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
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