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Shkatulov, Alexandr
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article
Stabilization of K2CO3 in vermiculite for thermochemical energy storage
Abstract
<p>Thermochemical energy storage (TCES) is an emerging technology promising for domestic applications. Recently, K<sub>2</sub>CO<sub>3</sub> was identified and studied as a TCES material. In this work, the composite “K<sub>2</sub>CO<sub>3</sub> in expanded vermiculite” (69 wt. % of the salt) was prepared and studied for thermochemical energy storage bearing in mind its application for space heating. The hydration rate was found to be higher for the confined K<sub>2</sub>CO<sub>3</sub> in comparison with K<sub>2</sub>CO<sub>3</sub> granules of the same size. While morphology and texture of the composite alter after 74 hydration/dehydration cycles, its chemical composition and average grain size do not change. The energy storage density of the composite bed can reach 0.9 GJ/m<sup>3</sup> (250 kWh/m<sup>3</sup>) for cycles with deliquescence which makes the composite an inexpensive thermochemical material for space heating. Stable conversion for deliquescence conditions was shown for at least 47 cycles.</p>