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Doping Magnesium Hydroxide with Sodium Nitrate: A New Approach to Tune the Dehydration Reactivity of Heat-Storage Materials Full article

Journal ACS Applied Materials and Interfaces
ISSN: 1944-8244 , E-ISSN: 1944-8252
Output data Year: 2014, Volume: 6, Number: 22, Pages: 19966-19977 Pages count : 11 DOI: 10.1021/am505418z
Tags Brucite, Dehydration kinetics, Magnesium hydroxide, Middle-temperature heat, Thermochemical heat storage
Authors Shkatulov Alexandr 1,2 , Krieger Tamara 1 , Zaikovskii Vladimir 1,2 , Chesalov Yurii 1,2 , Aristov Yuri I. 1,2
Affiliations
1 Boreskov Institute of Catalysis, Lavrentieva av., 5, Novosibirsk, Russia
2 Novosibirsk State University, Pirogova str., 2, Novosibirsk, Russia

Abstract: Thermochemical energy storage (TES) provides a challenging approach for improving the efficiency of various energy systems. Magnesium hydroxide, Mg(OH)2, is known as a suitable material for TES at temperature T > 300 °C. In this work, the thermal decomposition of Mg(OH)2 in the absence and presence of sodium nitrate (NaNO3) is investigated to adapt this material for TES at T < 300 °C. The most notable observations described for the doped Mg(OH)2 are (1) a significant reduction of the decomposition temperature Td that allows tuning the dehydration reactivity by varying the NaNO3 content. The Td decrease by 25 °C is revealed at a salt content Y ≤ 2.0 wt %. The maximum Td depression of some 50 °C is observed at Y = 15–20 wt %; (2) the NaNO3-doped Mg(OH)2 decomposes considerably faster under conditions typical for closed TES cycles (at T > 300 °C in vapor atmosphere) than a pure Mg(OH)2; (3) the morphology of the dehydration product (MgO) dramatically changes. Differential scanning calorimetry, high-resolution transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and vibrational spectroscopy (IR and Raman) are used to study the observed effects and to elucidate possible ways the NaNO3 influences the Mg(OH)2 dehydration and morphology of the dehydration product. The mechanism involving a chemical interaction between the salt and the hydroxide accompanied by nitrate embedding into brucite layers is discussed.
Cite: Shkatulov A. , Krieger T. , Zaikovskii V. , Chesalov Y. , Aristov Y.I.
Doping Magnesium Hydroxide with Sodium Nitrate: A New Approach to Tune the Dehydration Reactivity of Heat-Storage Materials
ACS Applied Materials and Interfaces. 2014. V.6. N22. P.19966-19977. DOI: 10.1021/am505418z WOS Scopus РИНЦ ANCAN PMID OpenAlex
Dates:
Submitted: Aug 15, 2014
Accepted: Oct 21, 2014
Published online: Nov 5, 2014
Published print: Nov 26, 2014
Identifiers:
Web of science: WOS:000345721400063
Scopus: 2-s2.0-84914674973
Elibrary: 24011530
Chemical Abstracts: 2014:1792176
Chemical Abstracts (print): 161:717888
PMID: 25333760
OpenAlex: W2312588556
Citing:
DB Citing
Web of science 49
Scopus 51
Elibrary 49
OpenAlex 55
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