Dehydration kinetics and thermodynamics of ZrO(NO3)2-doped Ca(OH)2 for chemical heat storage

Ya Ting Li; Meng Tian Li; Zhi Bin Xu; Zi Hui Meng; Qin Pei Wu

doi:10.1016/j.cej.2020.125841

Dehydration kinetics and thermodynamics of ZrO(NO₃)₂-doped Ca(OH)₂ for chemical heat storage

Ya Ting Li, Meng Tian Li, Zhi Bin Xu, Zi Hui Meng, Qin Pei Wu^*

^*Corresponding author for this work

School of Chemistry and Chemical Engineering

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

Long-term heat storage provides an efficient way to utilize solar energy. Hydroxides are potential candidates for this purpose by dehydration-hydration. In this study, we investigated the effect of doping calcium hydroxide with ZrO(NO₃)₂ on the thermodynamic and kinetic performance for heat storage. ZrO(NO₃)₂ improved the heat-storage performance of calcium hydroxide and significantly decreased the dehydration temperature. Differential scanning calorimetry and thermogravimetric data indicated that both the dehydration rate and heat-storage capacity of Ca(OH)₂ at 310 °C notably increased by doping with ZrO(NO₃)₂. The Coats–Redfern integral method and Archar–Brindley–Sharp–Wendworth differential method were used to calculate the pre-exponential factor and the activation energy. The activation energy of the dehydration reaction decreased from 176 to 130 kJ/mol by doping with 10 wt% ZrO(NO₃)₂ (ZrO(NO₃)₂-Ca(OH)₂-x composite, x = 10). The dehydration-mechanism functions for both the ZrO(NO₃)₂-Ca(OH)₂-10 composite and pure Ca(OH)₂ were determined to be the same. The kinetic control equation of the ZrO(NO₃)₂-Ca(OH)₂-x composites was derived and tested. The cycling stability for heat storage was investigated. The results showed that these composites are promising materials for long-term heat storage.

Original language	English
Article number	125841
Journal	Chemical Engineering Journal
Volume	399
DOIs	https://doi.org/10.1016/j.cej.2020.125841
Publication status	Published - 1 Nov 2020

Keywords

Dehydration
Heat storage
Hydroxide
Kinetics
Pyrolysis
Thermodynamics

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10.1016/j.cej.2020.125841

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title = "Dehydration kinetics and thermodynamics of ZrO(NO3)2-doped Ca(OH)2 for chemical heat storage",

abstract = "Long-term heat storage provides an efficient way to utilize solar energy. Hydroxides are potential candidates for this purpose by dehydration-hydration. In this study, we investigated the effect of doping calcium hydroxide with ZrO(NO3)2 on the thermodynamic and kinetic performance for heat storage. ZrO(NO3)2 improved the heat-storage performance of calcium hydroxide and significantly decreased the dehydration temperature. Differential scanning calorimetry and thermogravimetric data indicated that both the dehydration rate and heat-storage capacity of Ca(OH)2 at 310 °C notably increased by doping with ZrO(NO3)2. The Coats–Redfern integral method and Archar–Brindley–Sharp–Wendworth differential method were used to calculate the pre-exponential factor and the activation energy. The activation energy of the dehydration reaction decreased from 176 to 130 kJ/mol by doping with 10 wt% ZrO(NO3)2 (ZrO(NO3)2-Ca(OH)2-x composite, x = 10). The dehydration-mechanism functions for both the ZrO(NO3)2-Ca(OH)2-10 composite and pure Ca(OH)2 were determined to be the same. The kinetic control equation of the ZrO(NO3)2-Ca(OH)2-x composites was derived and tested. The cycling stability for heat storage was investigated. The results showed that these composites are promising materials for long-term heat storage.",

keywords = "Dehydration, Heat storage, Hydroxide, Kinetics, Pyrolysis, Thermodynamics",

author = "Li, {Ya Ting} and Li, {Meng Tian} and Xu, {Zhi Bin} and Meng, {Zi Hui} and Wu, {Qin Pei}",

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year = "2020",

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doi = "10.1016/j.cej.2020.125841",

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AU - Li, Ya Ting

AU - Li, Meng Tian

AU - Xu, Zhi Bin

AU - Meng, Zi Hui

AU - Wu, Qin Pei

PY - 2020/11/1

Y1 - 2020/11/1

N2 - Long-term heat storage provides an efficient way to utilize solar energy. Hydroxides are potential candidates for this purpose by dehydration-hydration. In this study, we investigated the effect of doping calcium hydroxide with ZrO(NO3)2 on the thermodynamic and kinetic performance for heat storage. ZrO(NO3)2 improved the heat-storage performance of calcium hydroxide and significantly decreased the dehydration temperature. Differential scanning calorimetry and thermogravimetric data indicated that both the dehydration rate and heat-storage capacity of Ca(OH)2 at 310 °C notably increased by doping with ZrO(NO3)2. The Coats–Redfern integral method and Archar–Brindley–Sharp–Wendworth differential method were used to calculate the pre-exponential factor and the activation energy. The activation energy of the dehydration reaction decreased from 176 to 130 kJ/mol by doping with 10 wt% ZrO(NO3)2 (ZrO(NO3)2-Ca(OH)2-x composite, x = 10). The dehydration-mechanism functions for both the ZrO(NO3)2-Ca(OH)2-10 composite and pure Ca(OH)2 were determined to be the same. The kinetic control equation of the ZrO(NO3)2-Ca(OH)2-x composites was derived and tested. The cycling stability for heat storage was investigated. The results showed that these composites are promising materials for long-term heat storage.

AB - Long-term heat storage provides an efficient way to utilize solar energy. Hydroxides are potential candidates for this purpose by dehydration-hydration. In this study, we investigated the effect of doping calcium hydroxide with ZrO(NO3)2 on the thermodynamic and kinetic performance for heat storage. ZrO(NO3)2 improved the heat-storage performance of calcium hydroxide and significantly decreased the dehydration temperature. Differential scanning calorimetry and thermogravimetric data indicated that both the dehydration rate and heat-storage capacity of Ca(OH)2 at 310 °C notably increased by doping with ZrO(NO3)2. The Coats–Redfern integral method and Archar–Brindley–Sharp–Wendworth differential method were used to calculate the pre-exponential factor and the activation energy. The activation energy of the dehydration reaction decreased from 176 to 130 kJ/mol by doping with 10 wt% ZrO(NO3)2 (ZrO(NO3)2-Ca(OH)2-x composite, x = 10). The dehydration-mechanism functions for both the ZrO(NO3)2-Ca(OH)2-10 composite and pure Ca(OH)2 were determined to be the same. The kinetic control equation of the ZrO(NO3)2-Ca(OH)2-x composites was derived and tested. The cycling stability for heat storage was investigated. The results showed that these composites are promising materials for long-term heat storage.

KW - Dehydration

KW - Heat storage

KW - Hydroxide

KW - Kinetics

KW - Pyrolysis

KW - Thermodynamics

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Dehydration kinetics and thermodynamics of ZrO(NO₃)₂-doped Ca(OH)₂ for chemical heat storage

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Keywords

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