Preparation and performance study of zeolite/hydrated salt adsorption heat storage materials

doi:10.19799/j.cnki.2095-4239.2025.0237

Abstract

Abstract:

Toward the goal of "reaching the peak of carbon and carbon neutrality," China is vigorously developing renewable energy and actively developing energy storage technology to address the critical problems of supply and demand imbalance—space-time difference, intermittence, and instability. Thermochemical adsorption heat storage offers the advantages of high heat storage density and low heat loss, making it one of the most promising heat storage technologies. Zeolite is well-known for its applications in adsorption and heat storage, but it has the disadvantage of relatively low heat storage density. Impregnating zeolite with hydrated salts can effectively address these problems. However, systematic research on the optimal ratio of hydrated salts in zeolite/hydrated salt composites is lacking. In this study, zeolite was impregnated with four commonly used hydrated salt materials, namely, MgSO₄·7H₂O, MgCl₂·6H₂O, LaCl₃·7H₂O, and CaCl₂·2H₂O. Adsorption and heat storage materials composed of zeolite/hydrated salt with different mass fractions were then prepared. The adsorption properties, heat storage density, and cycling properties of these materials were examined comprehensively. The results showed that the optimum mass fraction of MgCl₂ impregnated with zeolite was 30%. This material achieved the best adsorption performance (44.99%) and the highest heat storage density (638.9 J/g) at 80% relative humidity (RH). The second-best performance was achieved by MgSO₄ impregnated with zeolite, which had an adsorption mass of 38.0% and a heat storage density of 568.5 J/g at 80% RH. The results of subsequent cyclic experiments showed that the zeolite composite impregnated with 10% MgSO₄ had the best cyclic stability but lower adsorption property and heat storage density than the zeolite/MgCl₂ heat storage material with a 30% mass fraction. This work will support research on zeolite/hydrated salt composites and provide a reference for the performance improvement and application of zeolite heat storage materials.

Key words: adsorption heat storage, zeolite, hydrous salt, adsorption performance, heat storage density

CLC Number:

TK 02

Yiming CHEN, Haoshu LING, Meng LIU, Yujie XU, Guoqing SHEN, Yun JIA, Haisheng CHEN. Preparation and performance study of zeolite/hydrated salt adsorption heat storage materials[J]. Energy Storage Science and Technology, 2025, 14(7): 2853-2864.

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