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

Manca Ocvirk, Alenka Ristić and Nataša Zabukovec Logar
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Manca Ocvirk: National Institute of Chemistry, Hajdrihova 19, 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

Energies, 2021, vol. 14, issue 22, 1-15

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 .

Keywords: mesoporous γ-Al 2 O 3; TCM composite; hydrothermal synthesis; structural properties; water sorption capacity; sorption heat storage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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