Journal of South China University of Technology(Natural Science) >

2023 , Vol. 51 >Issue 8: 71 - 79

DOI: https://doi.org/10.12141/j.issn.1000-565X.220352

Energy, Power & Electrical Engineering

Kinetics of Dehydration/Adsorption Reaction of LaCl3

  • LOU Bo ,
  • ZHOU Daheng ,
  • XIA Jun
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  • School of Electric Power Engineering，South China University of Technology，Guangzhou 510640，Guangdong，China
楼波（1965-），男，博士，副教授，主要从事燃烧理论与节能技术研究。

Received date: 2022-06-06

  Online published: 2023-03-28

Supported by

the Natural Science Foundation of Guangdong Province(2021B1515020071)

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Abstract

LaCl3 is one of the most promising hydrated salt thermochemical heat storage materials, and its reaction kinetics plays a crucial role in the study of its reaction characteristics. The study tested the reaction characteristics of dehydration and adsorption of LaCl3 by experiments and analyzed the reaction kinetics mechanism. The dehydration process of LaCl3·7H2O at the heating rates of 1, 10 and 20 K/min was tested by a synchronous thermal analyzer. The results show that the dehydration process of LaCl3·7H2O can be divided into three stages, where 4,2 and 1 water molecules are removed respectively.The initial temperature of each stage is different at different heating rates. The activation energy value of three stages was calculated by FWO method and the activation energy of the first stage was the largest. The Doyle method was used to solve the mechanism functions of each stage, in which the first stage conforms to the shrinking cylinder model in the phase boundary reaction, while the second and the third stage conformed to the random nucleation and subsequent growth model. The adsorption process of LaCl3 was tested at the temperature of 15, 20, 25, 30 ℃ and at the relative humidity of 40%, 60%, 80% by a constant temperature and humidity chamber. The adsorption reaction rate of LaCl3 is positively correlated with the temperature and humidity. When the relative humidity is 40%, LaCl3 does not decompose. The reaction rate of LaCl3 is faster in the initial stage of the adsorption process. As the adsorption process proceeds, LaCl3·nH2O crystals formed on the surface restricts the contact between LaCl3 and water vapor. The kinetic equation of LaCl3 adsorption reaction was fitted, the adsorption process of LaCl3 conformed to the chemical reaction series model, and the reaction order was 0.837. The results show that LaCl3 has good chemical kinetics and high heat release, and is a potential chemical thermal storage material.

Key words： lanthanum chloride; thermochemical heat storage; reaction kinetics; activation energy; mechanism function

Cite this article

LOU Bo , ZHOU Daheng , XIA Jun . Kinetics of Dehydration/Adsorption Reaction of LaCl3[J]. Journal of South China University of Technology(Natural Science), 2023 , 51(8) : 71 -79 . DOI: 10.12141/j.issn.1000-565X.220352

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