4.7 Article

Thermochemical storage of medium-temperature heat using MgO promoted with eutectic ternary mixture LiNO3-NaNO3-KNO3

期刊

JOURNAL OF ENERGY STORAGE
卷 51, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.est.2022.104409

关键词

Thermochemical energy storage; Magnesium oxide; Magnesium carbonate; Medium-temperature heat; Modification; Eutectic salt mixture

资金

  1. Tokyo Tech World Research Hub Initiative (WRHI)

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This study investigates the modification of MgO with the triple eutectic mixture LiNO3-NaNO3-KNO3 in order to improve its decarbonation performance. The composites were comprehensively characterized and tested for their sorption properties. The results show that the material has high conversion rate, CO2 uptake, and excellent heat storage capacity at high temperatures.
Decarbonation of MgCO3 is promising for thermochemical energy storage (TCES) at medium temperatures as it has appropriate reaction thermodynamics and low material cost. For approaching the problem of kinetic hindrance and severe reaction metastability, MgO was modified with the triple eutectic mixture LiNO3-NaNO3-KNO3 (Li0.30Na0.18K0.52NO3) to investigate the sorption/desorption properties, which were studied in detail for prospective conditions of a TCES system. The composites with various salt contents were comprehensively characterized by X-ray diffraction, N-2 sorption, Scanning electron microscopy(SEM). The sorption behavior was tested at various salt contents, temperatures (290-360 degrees C) and CO2 pressures (50-100 kPa). The conversion of MgO to MgCO3 up to 0.65 and the CO2 uptake up to 16.2 mmol/g were found. The heat storage capacity reached 950 kJ/kg-composite and decreased down to 750 kJ/kg-composite after 20 carbonation/decarbonation cycles. The results obtained suggest an excellent performance of the material under the conditions that allow utilization of heat at T > 400 degrees C.

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