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Adapting the MgO-CO2 Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO3 Content

doi: 10.3390/en12122262
The MgO-CO2 working pair has been regarded as prospective for thermochemical energy storage (TCES) due to its relatively high heat storage capacity, low cost, and wide availability. This study is aimed at the optimization of the molar salt content, α, for the MgO modified with the eutectic mixture of LiNO3 and KNO3 (Li0.42K0.58NO3) which was earlier shown to provide high conversion, Δx, in heat-storage/release processes at 300–400 °C. The composites that have different salt content were prepared and carbonation kinetics was investigated under various conditions (carbonation temperature, Tcarb., is 290–360 °C and CO2 pressure, P(CO2), is 50–101 kPa). Significant accelerating effect was revealed at α ≥ 0.05, and the Δx value was maximized at α = 0.10–0.20. The largest conversion of 0.70 was detected at α = 0.10 and Tcarb. = 350 °C that corresponds to the specific useful heat (Qcomp.) is 1.63 MJ/kg-composite. However, the salt content of 0.20 ensures the high conversion, Δx = 0.63–0.67 and Qcomp. = 1.18–1.25 MJ/kg-composite in the whole temperature range between 290 and 350 °C. The (LiK)NO3/MgO composite with an optimal salt content of 0.20 exhibits reasonable durability through cyclic experiment at 330 °C, namely, the stabilized reacted conversion Δx = 0.34 (Qcomp. = 0.64 MJ/kg-composite). The studied (Li0.42K0.58)NO3 promoted MgO-CO2 working pair has good potential as thermochemical storage material of middle temperature heat (300–400 °C).
- Eindhoven University of Technology Netherlands
- Technical University Eindhoven TU Eindhoven Research Portal Netherlands
- Technical University Eindhoven Netherlands
- Boreskov Institute of Catalysis Russian Federation
- Technical University Eindhoven Netherlands
Technology, Control and Optimization, Energy Engineering and Power Technology, magnesium oxide, eutectic mixture, salt modification, SDG 7 - Affordable and Clean Energy, Renewable Energy, Electrical and Electronic Engineering, Magnesium oxide, Magnesium carbonate, Sustainability and the Environment, T, Thermochemical energy storage, 300, Eutectic mixture, magnesium carbonate, Salt modification, thermochemical energy storage, SDG 7 – Betaalbare en schone energie, Energy (miscellaneous)
Technology, Control and Optimization, Energy Engineering and Power Technology, magnesium oxide, eutectic mixture, salt modification, SDG 7 - Affordable and Clean Energy, Renewable Energy, Electrical and Electronic Engineering, Magnesium oxide, Magnesium carbonate, Sustainability and the Environment, T, Thermochemical energy storage, 300, Eutectic mixture, magnesium carbonate, Salt modification, thermochemical energy storage, SDG 7 – Betaalbare en schone energie, Energy (miscellaneous)
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