Abstract
Thermochemical energy storage can reduce fossil fuel consumption, which is still dominant in heating of buildings. The efficiency of the sorption technology is determined by the performance of the adsorbent, which should have a high water adsorption capacity and, consequently, a high energy storage density, stability under humid conditions, and fast kinetics of adsorption and desorption. In this study we investigated the effect of different elemental compositions of the commercial and laboratory prepared microporous aluminophosphates, natural and synthetic zeolites with chabazite structure and their modifications in powder and granular form on water adsorption capacity. The highest water uptake among the aluminophosphates was found for APO-34-IL, which was prepared by green synthesis with the low cost ionic liquid, while the highest water uptake of all the samples analysed was found for the composites of the natural zeolite with CaCl2.
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