Kinetic Analysis of Hydrogen Reduction of Nickel Compounds
Pöyhtäri, Sonja; Ruokoja, Juhani; Heikkinen, Eetu-Pekka; Heikkilä, Anne; Kokkonen, Tommi; Tynjälä, Pekka (2023-11-14)
Pöyhtäri, Sonja
Ruokoja, Juhani
Heikkinen, Eetu-Pekka
Heikkilä, Anne
Kokkonen, Tommi
Tynjälä, Pekka
Asm international
14.11.2023
Pöyhtäri, S., Ruokoja, J., Heikkinen, EP. et al. Kinetic Analysis of Hydrogen Reduction of Nickel Compounds. Metall Mater Trans B 55, 251–265 (2024). https://doi.org/10.1007/s11663-023-02955-6
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© The Author(s) 2023. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
https://creativecommons.org/licenses/by/4.0/
© The Author(s) 2023. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202401111186
https://urn.fi/URN:NBN:fi:oulu-202401111186
Tiivistelmä
Abstract
A review on the hydrogen reduction kinetics of NiO, NiCO3, and Ni(OH)2 hydrogen was conducted, and the most significant experimental values and results were summarized from the past two decades. Isothermal hydrogen reduction experiments of NiO, NiCO3, and, Ni(OH)2 experiments were carried out at 300 °C, 400 °C, and 500 °C, and the obtained data were fitted to multiple different solid-state kinetic models in order to compare the suitability of the models. Non-isothermal reduction in H2 (0 °C --> 900 °C) showed the decomposition of NiCO3 at a temperature range of 230 °C to 300 °C and Ni(OH)2 at 220 °C to 300 °C. The calculated Ea values for NiCO3, Ni(OH)2, and NiO varied between 30 and 35, 36 and 37, and 21 and 26 kJ/mol, respectively. Most of the used models were well fitted making the choice of unequivocally the best suitable model difficult and the identification of the mechanism behind the reaction. It was concluded that an increase in temperature accelerates the reduction process, and the reaction rate-controlling mechanism requires more extensive investigation.
A review on the hydrogen reduction kinetics of NiO, NiCO3, and Ni(OH)2 hydrogen was conducted, and the most significant experimental values and results were summarized from the past two decades. Isothermal hydrogen reduction experiments of NiO, NiCO3, and, Ni(OH)2 experiments were carried out at 300 °C, 400 °C, and 500 °C, and the obtained data were fitted to multiple different solid-state kinetic models in order to compare the suitability of the models. Non-isothermal reduction in H2 (0 °C --> 900 °C) showed the decomposition of NiCO3 at a temperature range of 230 °C to 300 °C and Ni(OH)2 at 220 °C to 300 °C. The calculated Ea values for NiCO3, Ni(OH)2, and NiO varied between 30 and 35, 36 and 37, and 21 and 26 kJ/mol, respectively. Most of the used models were well fitted making the choice of unequivocally the best suitable model difficult and the identification of the mechanism behind the reaction. It was concluded that an increase in temperature accelerates the reduction process, and the reaction rate-controlling mechanism requires more extensive investigation.
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