Analysis of Iron Oxide Reduction Kinetics in the Nanometric Scale Using Hydrogen
Abstract
:1. Introduction
1.1. Background
1.2. Theory
The Kissinger Method
2. Materials and Methods
3. Results and Analysis
3.1. Iron Nanopowder
3.1.1. Non-Isothermal Reduction of Oxide Layer on Fe Nanopowder
3.1.2. Reduction Kinetics for Removal of Oxide Layer on Fe Nanopowder
3.2. Iron Oxide Nanopowder
3.2.1. Non-Isothermal Reduction of Fe2O3 Nanopowder
3.2.2. Reduction Kinetics for Fe2O3 Nanopowder
3.3. Kissinger Approach for Iron and Iron Oxide Reduction Kinetics
3.4. Proposed Model
- During the prereduction step, Fe2O3 is reduced to Fe3O4 completely. As the density of Fe3O4 is higher than that of Fe2O3, a porous Fe3O4 structure is expected upon transformation.
- The porous Fe3O4 is reduced to metallic Fe during the main reduction step, resulting in islands of metallic Fe.
- Catalytic reaction: The freshly formed metallic iron surfaces exhibit an auto-catalytic nature, supporting the chemisorption and disassociation of hydrogen molecules to yield active hydrogen atoms which are transferred or transported from metal surface to the metal/oxide interfaces through ‘portholes’ of water vapour [25,27].
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Data Statement
References
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Iron Oxide | Activation Energy, kJ/mol | Reduction | Temperature Range, °C |
---|---|---|---|
Granulated Fe2O3 nanopowder [23] α-Fe2O3 → Fe2O3 → Fe | 75–125 | Hydrogen reduction, Isoconversional approach | 320–500 |
Ball milled Fe2O3 nanopowder agglomerates [21] α-Fe2O3 → Fe2O3 → Fe | 20–46 | Hygrometry method, Hydrogen reduction Isoconversional approach | 270–580 |
Both natural and laboratory iron oxide α-Fe2O3 →Fe3O4 [24] | 108 | Hydrogen reduction | 250–400 |
99.8% pure iron oxide α-Fe2O3 → Fe3O4, [19] | 76 | Hydrogen reduction | 220–683 |
α-Fe2O3 → Fe3O4, [19] | 95 | H2–N2 | 337–604 |
α-Fe2O3 → Fe3O4, [19] | 114 | CO | 265–482 |
Fe3O4 → Fe, [19] | 39–88 | Hydrogen reduction | 220–683 |
Fe3O4 → Fe, [19] | 36–103 | H2–N2 | 337–604 |
Fe3O4 → Fe, [19] | 40–114 | CO | 265–482 |
α-Fe2O3 →Fe3O4, [22] | 90 | Temperature programmed reduction | 230–380 |
Fe3O4 →Fe, [22] | 70 | Temperature programmed reduction | 330–730 |
Iron oxide nanopowder α-Fe2O3 → Fe3O4, this work | 105–120 | Hydrogen reduction Isoconversional approach | 230–430 |
Fe3O4 → Fe, this work | 45–55 | Hydrogen reduction Isoconversional approach | 430–680 |
Reaction | Activation Energy, Isoconversional Approach, kJ/mol | Activation Energy, Kissinger Approach, kJ/mol |
---|---|---|
Fe nanopowder surface oxide reduction (40–60 nm) | 118–65 | 62–70 |
Fe nanopowder surface oxide reduction (60–80 nm) | 115–71 | 78–84 |
Fe2O3 nanopowder, Fe2O3 → Fe3O4 | 105–120 | 109–117 |
Fe2O3 nanopowder, Fe3O4 → Fe | 55–45 | 45–55 |
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Manchili, S.K.; Wendel, J.; Hryha, E.; Nyborg, L. Analysis of Iron Oxide Reduction Kinetics in the Nanometric Scale Using Hydrogen. Nanomaterials 2020, 10, 1276. https://doi.org/10.3390/nano10071276
Manchili SK, Wendel J, Hryha E, Nyborg L. Analysis of Iron Oxide Reduction Kinetics in the Nanometric Scale Using Hydrogen. Nanomaterials. 2020; 10(7):1276. https://doi.org/10.3390/nano10071276
Chicago/Turabian StyleManchili, Swathi K., Johan Wendel, Eduard Hryha, and Lars Nyborg. 2020. "Analysis of Iron Oxide Reduction Kinetics in the Nanometric Scale Using Hydrogen" Nanomaterials 10, no. 7: 1276. https://doi.org/10.3390/nano10071276