THERMAL SCIENCE

International Scientific Journal

Azhar Abbas Khosa

,

Najam-Ul-Hassan Shah

,

Xinyue Han

,

Naveed Husnain

SILICA DOPANT EFFECT ON THE PERFORMANCE OF CALCIUM CARBONATE/CALCIUM OXIDE BASED THERMAL ENERGY STORAGE SYSTEM

ABSTRACT
The CaCO3 is being studied for its application in thermal energy storage. However, it has drawbacks of slow reaction rate during calcination and incomplete reversible carbonation which limit its use. In this paper, SiO2 has been studied as a dopant for CaCO3 to improve its cyclic performance. The CaCO3 samples were loaded with different concentrations of SiO2 and its effect on the thermal energy density of CaCO3 was determined. Afterwards, the effect of the dopant on the heat storage process of the synthesized composite along with kinetics of decarbonation reaction was investigated. Cyclic tests were performed to determine the reusability of the material. It was found that the addition of dopant helped to increase the rate of decarbonation reaction, thereby making the heat storage process more efficient as compared to pure CaCO3. The activation energy values are 255.9 kJ/mol, 280.1 kJ/mol, 244.9 kJ/mol, and 234.8 kJ/mol for 5%, 15%, 30%, and 0% doped SiO2 samples, respectively. Furthermore, thermal energy storage density increases when the amount of dopant decreases in the samples such as the 30% and 5% doped samples have gravimetric energy storage densities of 339.85 J/g and 759.24 J/g, respectively. It was observed that the large quantities (15% and 30%) of dopant had introduced a new phase of Ca3SiO5 during CaCO3 decomposition.
KEYWORDS
Thermochemical heat storage, Catalysis, kinetics analysis, Non-isothermal Methods
PAPER SUBMITTED: 2023-04-22
PAPER REVISED: 2023-06-19
PAPER ACCEPTED: 2023-06-23
PUBLISHED ONLINE: 2023-08-05
DOI REFERENCE: https://doi.org/10.2298/TSCI230422165K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 2, PAGES [837 - 850]
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Silica dopant effect on the performance of calcium carbonate/calcium oxide based thermal energy storage system

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence