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Synthesis of Mesoporous γ-Alumina Support for Water Composite Sorbents for Low Temperature Sorption Heat Storage

Author

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  • Manca Ocvirk

    (National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
    Jožef Stefan International Postgraduate School, Jamova Cesta 39, 1000 Ljubljana, Slovenia)

  • Alenka Ristić

    (National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia)

  • Nataša Zabukovec Logar

    (National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
    School of Science, University of Nova Gorica, Vipavska Cesta 13, 5000 Nova Gorica, Slovenia)

Abstract

The efficiency of thermochemical heat storage is crucially determined by the performance of the sorbent used, which includes a high sorption capacity and a low regeneration temperature. The thermochemical salt hydrate– γ-alumina composite sorbents are promising materials for this application but lack systematic study of the influence of γ-alumina structural properties on the final storage performance. In this study, mesoporous γ-Al 2 O 3 supports were prepared by solvothermal and hydrothermal synthesis containing a block copolymer (F-127) surfactant to design thermochemical CaCl 2 and LiCl composite water sorbents. Altering the solvent in the synthesis has a significant effect on the structural properties of the γ-Al 2 O 3 mesostructure, which was monitored by powder XRD, nitrogen physisorption, and SEM. Solvothermal synthesis led to a formation of mesoporous γ-Al 2 O 3 with higher specific surface area (213 m 2 /g) and pore volume (0.542 g/cm 3 ) than hydrothermal synthesis (147 m 2 /g; 0.414 g/cm 3 ). The highest maximal water sorption capacity (2.87 g/g) and heat storage density (5.17 GJ/m 3 ) was determined for W-46-LiCl containing 15 wt% LiCl for space heating, while the best storage performance in the sense of fast kinetics of sorption, without sorption hysteresis, low desorption temperature, very good cycling stability, and energy storage density of 1.26 GJ/m 3 was achieved by W-46-CaCl 2 .

Suggested Citation

  • Manca Ocvirk & Alenka Ristić & Nataša Zabukovec Logar, 2021. "Synthesis of Mesoporous γ-Alumina Support for Water Composite Sorbents for Low Temperature Sorption Heat Storage," Energies, MDPI, vol. 14(22), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:22:p:7809-:d:684885
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    References listed on IDEAS

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