452449 Design of Manganese Oxide-Based Particles for High-Temperature Thermochemical Energy Storage

Wednesday, November 16, 2016: 9:36 AM
Powell (Hilton San Francisco Union Square)
Barbara J. Ward1, Brian D. Ehrhart1, Roman Bader2, Peter Kreider2, Wojciech Lipinski2 and Alan W. Weimer2,3, (1)Chemical & Biological Engineering, University of Colorado at Boulder, Boulder, CO, University of Colorado at Boulder, Boulder, CO, (2)Research School of Engineering, The Australian National University, Canberra, Australia, (3)Chemical & Biological Engineering, University of Colorado at Boulder, Boulder, CO

High-temperature thermochemical energy storage shows promise in aiding concentrating solar power plants in meeting variable, grid-scale electricity demand. In this work, manganese oxide-based mixed metal oxide particles have been designed and tested for thermochemical energy storage. Particles are designed for high energy storage capacity, flowability, and physical and chemical stability. We evaluate the effects of Al2O3, Fe2O3, and ZrO2 in Mn2O3-based spray-dried particles in a TGA between 650°C and 1,200°C over six consecutive redox cycles. Results are compared with thermodynamic predictions from 400-1,400°C under oxidizing and reducing atmospheres. A mixture of 2:1 Fe2O3:Mn2O3 formed iron manganese oxide spinel (Fe2MnO4) on calcination, and demonstrated the highest thermochemical activity despite particle agglomeration and deformation. Conversely, zirconia was an inert support that does not react with manganese oxide. Differences in redox performance between materials with different Fe to Mn ratios have been attributed to ion diffusion and secondary phase formation.

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See more of this Session: Solar Thermochemical Energy Storage
See more of this Group/Topical: 2016 International Congress on Energy