Calcium hydroxide doped by KNO<sub>3</sub>as a promising candidate for thermochemical storage of solar heat

Shkatulov, Alexandr; Aristov, Yuri

doi:10.1039/c7ra06639b

Cited by 29 publications

(18 citation statements)

References 38 publications

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“…It is usually used in dentistry, industries, agriculture, and biomedical applications. Some other applications of calcium hydroxide include thermochemical heat storage [1,2]. It is noted that the semipermeable encapsulation of calcium hydroxide can be used for thermochemical heat storage by using the micrometer sized particles [1].…”

Section: Introductionmentioning

confidence: 99%

Influence of Impurity on the Properties of Chemically Synthesized Calcium Hydroxide

Harish¹,

Kumar²,

Kumari³

et al. 2021

J. Nano- Electron. Phys.

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Here we report synthesis and characterization of chemically synthesized calcium hydroxide (Ca(OH)2) with and without deliberate presence of NaNO3 as an impurity. Calcium nitrate tetrahydrate (Ca(NO3)2.4H2O) is used as precursor and alkaline NaOH solution is used as precipitant to synthesize the Ca(OH)2 samples. The samples were characterized by XRD, FESEM, FTIR spectroscopy, DTA, TGA and UV-Vis spectroscopy techniques. From the UV-Vis spectroscopy results, it is found that the Ca(OH)2 with NaNO3 impurity has higher bandgap than the sample without NaNO3. The weight loss in TGA is also more for the Ca(OH)2 with impurity than the one for without impurity. The results are discussed in terms of composition formed during synthesis process.

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Section: Introductionmentioning

confidence: 99%

Influence of Impurity on the Properties of Chemically Synthesized Calcium Hydroxide

Harish¹,

Kumar²,

Kumari³

et al. 2021

J. Nano- Electron. Phys.

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“…prepared Ca(OH) 2 pellets with carboxymethyl cellulose sodium as the binder, which achieved high mechanical strength and heat storage rates. In addition, the dehydration rate of Ca(OH) 2 was reduced with the addition of KNO 3 , whereas the hydration reaction barely improved 19 …”

Section: Introductionmentioning

confidence: 99%

Coupled CO₂ capture and thermochemical heat storage of CaO derived from calcium acetate

Sun

Yan

et al. 2020

Greenhouse Gases

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CaO/Ca(OH) 2 thermochemical heat storage (THS) technology is considered to be one of the most promising technologies for large-scale solar energy storage. However, the THS performance of raw CaO-based materials decreases during multiple cycles. In this work, CaO derived from calcium acetate (Ac-CaO) is prepared and applied to a coupled system that achieved simultaneous CaO/Ca(OH) 2 THS and CO 2 capture. The CO 2 capture and THS performances of Ac-CaO are always higher than those of calcined limestone owing to the preferable pore structure, whereas Ac-CaO exhibits decreasing CO 2 capture and THS performance resulting from sintering and the formation of CaCO 3 from CaO or Ca(OH) 2 with ambient CO 2 during air cooling, respectively. In the coupled CaO/Ca(OH) 2 THS and CO 2 capture system, Ac-CaO is subjected to 10 CO 2 capture cycles, 30 THS cycles, 1 CO 2 capture cycle, 10 THS cycles, 1 CO 2 capture cycle, and 10 THS cycles sequentially. The hydration and dehydration conversions of Ac-CaO in the 31st THS cycle reach 91.7 and 93.6%, respectively, which are 1.6 and 1.6 times higher than those recorded prior to the 11th CO 2 capture cycle owing to the decomposition of CaCO 3 during calcination. The carbonation conversion of Ac-CaO achieves 89.9% in the 11th CO 2 capture cycle, which is 22.3% higher than that recorded prior to the 10 THS cycles owing to reactivation from the hydration process during THS. The CO 2 capture and CaO/Ca(OH) 2 THS processes are enhanced in the coupled system using Ac-CaO; therefore, the coupled system appears promising for CaO/Ca(OH) 2 THS and CO 2 capture.

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“…Aside from large-scale industrial processes such as ammonia production [4] there are only a few solid-gas reactions that were extensively studied specifically for TCES at medium temperatures. They are dehydration of Mg(OH) 2 [5], Ca(OH) 2 [6], dehydrogenation of MgH 2 and some other hydrides [7].…”

Section: Introductionmentioning

confidence: 99%

“…temperatures. They are dehydration of Mg(OH)2 [5], Ca(OH)2 [6], dehydrogenation of MgH2 and some other hydrides [7]. The carbonation of MgO, Equation (1), that has the high reaction enthalpy, 116.4 kJ/mol, and suitable equilibrium temperature, Teq = 388 °C (at P(CO2) = 101 kPa), was considered for TCES since the late 70s [8].…”

Section: Introductionmentioning

confidence: 99%

Adapting the MgO-CO2 Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO3 Content

et al. 2019

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The MgO-CO2 working pair has been regarded as prospective for thermochemical energy storage (TCES) due to its relatively high heat storage capacity, low cost, and wide availability. This study is aimed at the optimization of the molar salt content, α, for the MgO modified with the eutectic mixture of LiNO3 and KNO3 (Li0.42K0.58NO3) which was earlier shown to provide high conversion, Δx, in heat-storage/release processes at 300–400 °C. The composites that have different salt content were prepared and carbonation kinetics was investigated under various conditions (carbonation temperature, Tcarb., is 290–360 °C and CO2 pressure, P(CO2), is 50–101 kPa). Significant accelerating effect was revealed at α ≥ 0.05, and the Δx value was maximized at α = 0.10–0.20. The largest conversion of 0.70 was detected at α = 0.10 and Tcarb. = 350 °C that corresponds to the specific useful heat (Qcomp.) is 1.63 MJ/kg-composite. However, the salt content of 0.20 ensures the high conversion, Δx = 0.63–0.67 and Qcomp. = 1.18–1.25 MJ/kg-composite in the whole temperature range between 290 and 350 °C. The (LiK)NO3/MgO composite with an optimal salt content of 0.20 exhibits reasonable durability through cyclic experiment at 330 °C, namely, the stabilized reacted conversion Δx = 0.34 (Qcomp. = 0.64 MJ/kg-composite). The studied (Li0.42K0.58)NO3 promoted MgO-CO2 working pair has good potential as thermochemical storage material of middle temperature heat (300–400 °C).

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Calcium hydroxide doped by KNO₃as a promising candidate for thermochemical storage of solar heat

Abstract: The addition of KNO3reduces the dehydration temperature of Ca(OH)2which is of interest for thermochemical heat storage.

Cited by 29 publications

References 38 publications

Influence of Impurity on the Properties of Chemically Synthesized Calcium Hydroxide

Influence of Impurity on the Properties of Chemically Synthesized Calcium Hydroxide

Coupled CO₂ capture and thermochemical heat storage of CaO derived from calcium acetate

Adapting the MgO-CO2 Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO3 Content

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Calcium hydroxide doped by KNO3as a promising candidate for thermochemical storage of solar heat

Abstract: The addition of KNO3reduces the dehydration temperature of Ca(OH)2which is of interest for thermochemical heat storage.

Cited by 29 publications

References 38 publications

Influence of Impurity on the Properties of Chemically Synthesized Calcium Hydroxide

Influence of Impurity on the Properties of Chemically Synthesized Calcium Hydroxide

Coupled CO2 capture and thermochemical heat storage of CaO derived from calcium acetate

Adapting the MgO-CO2 Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO3 Content

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Product

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Calcium hydroxide doped by KNO₃as a promising candidate for thermochemical storage of solar heat

Coupled CO₂ capture and thermochemical heat storage of CaO derived from calcium acetate