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Article

Impact of Partial Pressure, Conversion, and Temperature on the Oxidation Reaction Kinetics of Cu2O to CuO in Thermochemical Energy Storage

1
Institute of Chemical, Environmental and Bioscience Engineering, TU Wien, Getreidemarkt 9/166, 1060 Vienna, Austria
2
Institute for Energy Systems and Thermodynamics, TU Wien, Getreidemarkt 9/302, 1060 Vienna, Austria
*
Author to whom correspondence should be addressed.
Energies 2019, 12(3), 508; https://doi.org/10.3390/en12030508
Received: 8 December 2018 / Revised: 24 January 2019 / Accepted: 1 February 2019 / Published: 5 February 2019
(This article belongs to the Section D: Energy Storage and Application)
Metal oxides are promising potential candidates for thermochemical energy storage in concentrated solar power plants. In particular, the Cu2O/CuO system is suitable because of its high energy density, applied temperature interval, and reduced cost compared to the CoO/Co3O4 system. In heterogenous gas-solid reactions, the pressure affects the kinetics significantly. To quantify this effect for oxidation of Cu2O to CuO, isothermal runs between 800 °C and 930 °C at different oxygen partial pressures (0.1, 0.2, 0.5, and 1.0 bar) were conducted with thermogravimetric analysis (TGA). Defined fractions of CuO samples (1–100 µm) were analyzed with X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, and scanning electron microscopy (SEM) analysis. The kinetic analyses were performed with extended non-parametric kinetics (NPK), which is applied for the first time to consider the pressure term in the general kinetic equation in addition to the conversion and the temperature term. The results show how the oxygen partial pressure impacts the kinetics and how reparameterization of the pressure term affects the kinetic analysis of the oxidation reaction of Cu2O to CuO. The best conversion model is a two-dimensional Avrami-Erofeev model with an activation energy of 233 kJ/mol. The kinetic models for conversion, temperature, and pressure presented in this work provide one of the most important requirements for reactor designs. View Full-Text
Keywords: thermochemical energy storage; partial pressure; kinetics; thermogravimetric analysis; Cu2O/CuO thermochemical energy storage; partial pressure; kinetics; thermogravimetric analysis; Cu2O/CuO
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MDPI and ACS Style

Setoodeh Jahromy, S.; Birkelbach, F.; Jordan, C.; Huber, C.; Harasek, M.; Werner, A.; Winter, F. Impact of Partial Pressure, Conversion, and Temperature on the Oxidation Reaction Kinetics of Cu2O to CuO in Thermochemical Energy Storage. Energies 2019, 12, 508. https://doi.org/10.3390/en12030508

AMA Style

Setoodeh Jahromy S, Birkelbach F, Jordan C, Huber C, Harasek M, Werner A, Winter F. Impact of Partial Pressure, Conversion, and Temperature on the Oxidation Reaction Kinetics of Cu2O to CuO in Thermochemical Energy Storage. Energies. 2019; 12(3):508. https://doi.org/10.3390/en12030508

Chicago/Turabian Style

Setoodeh Jahromy, Saman, Felix Birkelbach, Christian Jordan, Clemens Huber, Michael Harasek, Andreas Werner, and Franz Winter. 2019. "Impact of Partial Pressure, Conversion, and Temperature on the Oxidation Reaction Kinetics of Cu2O to CuO in Thermochemical Energy Storage" Energies 12, no. 3: 508. https://doi.org/10.3390/en12030508

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