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

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 lac...

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Autores principales:	Manca Ocvirk, Alenka Ristić, Nataša Zabukovec Logar
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	mesoporous γ-Al<sub>2</sub>O<sub>3</sub> TCM composite hydrothermal synthesis structural properties water sorption capacity sorption heat storage Technology T
Acceso en línea:	https://doaj.org/article/5d8b846bff5e4073a78e7a042f90fe75
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spelling	oai:doaj.org-article:5d8b846bff5e4073a78e7a042f90fe752021-11-25T17:28:56ZSynthesis of Mesoporous γ-Alumina Support for Water Composite Sorbents for Low Temperature Sorption Heat Storage10.3390/en142278091996-1073https://doaj.org/article/5d8b846bff5e4073a78e7a042f90fe752021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7809https://doaj.org/toc/1996-1073The 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<sub>2</sub>O<sub>3</sub> supports were prepared by solvothermal and hydrothermal synthesis containing a block copolymer (F-127) surfactant to design thermochemical CaCl<sub>2</sub> and LiCl composite water sorbents. Altering the solvent in the synthesis has a significant effect on the structural properties of the γ-Al<sub>2</sub>O<sub>3</sub> mesostructure, which was monitored by powder XRD, nitrogen physisorption, and SEM. Solvothermal synthesis led to a formation of mesoporous γ-Al<sub>2</sub>O<sub>3</sub> with higher specific surface area (213 m<sup>2</sup>/g) and pore volume (0.542 g/cm<sup>3</sup>) than hydrothermal synthesis (147 m<sup>2</sup>/g; 0.414 g/cm<sup>3</sup>). The highest maximal water sorption capacity (2.87 g/g) and heat storage density (5.17 GJ/m<sup>3</sup>) 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<sup>3</sup> was achieved by W-46-CaCl<sub>2</sub>.Manca OcvirkAlenka RistićNataša Zabukovec LogarMDPI AGarticlemesoporous γ-Al<sub>2</sub>O<sub>3</sub>TCM compositehydrothermal synthesisstructural propertieswater sorption capacitysorption heat storageTechnologyTENEnergies, Vol 14, Iss 7809, p 7809 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	mesoporous γ-Al<sub>2</sub>O<sub>3</sub> TCM composite hydrothermal synthesis structural properties water sorption capacity sorption heat storage Technology T
spellingShingle	mesoporous γ-Al<sub>2</sub>O<sub>3</sub> TCM composite hydrothermal synthesis structural properties water sorption capacity sorption heat storage Technology T Manca Ocvirk Alenka Ristić Nataša Zabukovec Logar Synthesis of Mesoporous γ-Alumina Support for Water Composite Sorbents for Low Temperature Sorption Heat Storage
description	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<sub>2</sub>O<sub>3</sub> supports were prepared by solvothermal and hydrothermal synthesis containing a block copolymer (F-127) surfactant to design thermochemical CaCl<sub>2</sub> and LiCl composite water sorbents. Altering the solvent in the synthesis has a significant effect on the structural properties of the γ-Al<sub>2</sub>O<sub>3</sub> mesostructure, which was monitored by powder XRD, nitrogen physisorption, and SEM. Solvothermal synthesis led to a formation of mesoporous γ-Al<sub>2</sub>O<sub>3</sub> with higher specific surface area (213 m<sup>2</sup>/g) and pore volume (0.542 g/cm<sup>3</sup>) than hydrothermal synthesis (147 m<sup>2</sup>/g; 0.414 g/cm<sup>3</sup>). The highest maximal water sorption capacity (2.87 g/g) and heat storage density (5.17 GJ/m<sup>3</sup>) 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<sup>3</sup> was achieved by W-46-CaCl<sub>2</sub>.
format	article
author	Manca Ocvirk Alenka Ristić Nataša Zabukovec Logar
author_facet	Manca Ocvirk Alenka Ristić Nataša Zabukovec Logar
author_sort	Manca Ocvirk
title	Synthesis of Mesoporous γ-Alumina Support for Water Composite Sorbents for Low Temperature Sorption Heat Storage
title_short	Synthesis of Mesoporous γ-Alumina Support for Water Composite Sorbents for Low Temperature Sorption Heat Storage
title_full	Synthesis of Mesoporous γ-Alumina Support for Water Composite Sorbents for Low Temperature Sorption Heat Storage
title_fullStr	Synthesis of Mesoporous γ-Alumina Support for Water Composite Sorbents for Low Temperature Sorption Heat Storage
title_full_unstemmed	Synthesis of Mesoporous γ-Alumina Support for Water Composite Sorbents for Low Temperature Sorption Heat Storage
title_sort	synthesis of mesoporous γ-alumina support for water composite sorbents for low temperature sorption heat storage
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5d8b846bff5e4073a78e7a042f90fe75
work_keys_str_mv	AT mancaocvirk synthesisofmesoporousgaluminasupportforwatercompositesorbentsforlowtemperaturesorptionheatstorage AT alenkaristic synthesisofmesoporousgaluminasupportforwatercompositesorbentsforlowtemperaturesorptionheatstorage AT natasazabukoveclogar synthesisofmesoporousgaluminasupportforwatercompositesorbentsforlowtemperaturesorptionheatstorage
_version_	1718412285957898240

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

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