About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
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Presentation Title |
Multiscale Chemistry for Hydrogen-based Direct Reduction of Iron in Steelmaking |
Author(s) |
Xueli (Sherry) Zheng, Lauren Moghimi, Subhechchha Paul, Yi Cui, Leora Dresselhaus-Marais |
On-Site Speaker (Planned) |
Xueli (Sherry) Zheng |
Abstract Scope |
Steelmaking contributes to 8% of the total CO2 emissions globally. One approach to decarbonizing steelmaking is to shift from the coal-based blast furnaces to hydrogen-based direct reduction of iron. While extremely important, the chemistry in these reactors is often complex and poorly understood. Herein, we measure the kinetics of magnetite (Fe3O4) reduction with H2, comparing industrial Fe3O4 to the lab-synthesized nanoscale Fe3O4 samples. Using in-situ synchrotron X-ray diffraction, we demonstrate that the magnetite to wustite (FeO) step of the reaction occurs quickly, while the subsequent FeO to metallic Fe is rate-limiting. We “zoom in” on the nanoparticulate samples on the full T-dependence of the nanoscale chemistry and the associated structural changes in the sample morphology. Using small-angle X-ray scattering, we demonstrate how the kinetics evolve simultaneously with mesoscopic structural changes. Environmental transmission electron microscopy indicates the self-assembly and fusion of the reacting particles into elongated and irregular structures. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Sustainability, Phase Transformations |