Boric Acid: A High Potential Candidate for Thermochemical Energy Storage

Huber, Clemens; Jahromy, Saman Setoodeh; Jordan, Christian; Schreiner, Manfred; Harasek, Michael; Werner, Andreas; Winter, Franz

doi:10.3390/en12061086

Cited by 29 publications

(12 citation statements)

References 21 publications

(20 reference statements)

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“…Boric acid (H 3 BO 3 ) is another inorganic compound known as a flame retardant additive for wood, paper, and cotton [ 37 , 38 ]. Boric acid liberates water at the heating above ~100 °C according to the following reactions [ 39 , 40 ]: 2H 3 BO 3 →2HBO 2 + 2H 2 O 2HBO 2 → B 2 O 3 + H 2 O …”

Section: Introductionmentioning

confidence: 99%

Thermal Stability and Flammability of Epoxy Composites Filled with Multi-Walled Carbon Nanotubes, Boric Acid, and Sodium Bicarbonate

et al. 2021

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Epoxy composites filled with 0.5 wt% of multi-walled carbon nanotubes (MWCNTs), 10 and 15 wt% of boric acid and sodium bicarbonate separately, as well as composites filled with a combination of MWCNTs-boric acid and MWCNTs-sodium bicarbonate were prepared. The thermal behavior of the prepared samples was investigated under heating in oxidative environment using thermogravimetric analysis. The hardness was measured using the Shore D hardness test. To evaluate the flammability of the samples, the ignition temperature and time-to-ignition were determined. It was concluded that sodium bicarbonate in the studied concentrations (10 and 15 wt%) is not appropriate for use as a filler capable of improving the thermooxidative stability and reducing the flammability of epoxy polymers. The improvement in the thermal properties can be achieved by using the combination of boric acid and multi-walled carbon nanotubes as fillers. The thermooxidative destruction of the samples filled with boric acid passes more slowly and more evenly via the formation of B2O3 as a result of its decomposition.

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Section: Introductionmentioning

confidence: 99%

Thermal Stability and Flammability of Epoxy Composites Filled with Multi-Walled Carbon Nanotubes, Boric Acid, and Sodium Bicarbonate

et al. 2021

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“…It was known that boron oxide is considered an ideal strong amorphous forming material [3,8,13]. This is because B 2 O 3 or H 3 BO 3 cannot be crystallized under normal circumstances or at ambient pressure.…”

Section: Xrd Spectroscopymentioning

confidence: 99%

Characterization Studies on Calcium Borate Compound Modified by ZnCO3, CaCO3 and Fructose

El-Damrawi¹,

Abdelghany²,

Saad³

2021

J. Basic Appl. Sci.

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Calcium fructoborate solid materials of formula Ca(C6H10O6BO)2 ·3.5H2O were prepared by chemical wet technique. The neutral trigonal form of boron organic ester with fructose, under the solid form, is prepared and modified in solution in the anionic tetrahedral form; the borate compound is investigated by XRD spectroscopy. An ideal strong amorphous forming material is obtained upon modification with ZnCO3 or CaCO3. 11B NMR solids and solution and Raman spectroscopy were developed to determine different types and the amount of borate derivative present in products. The modifier portion from calcium carbonate and fructose are consumed for boron transformation from three to four coordinated units. Raman spectra of pure B2O3 confirm the presence of the borate boroxol ring as the main structural units. But different borate units are formed upon modification by calcium carbonate and fructose. Modification by ZnCO3 had a few effects on boron transformation. The chemical shift of 11 B NMR spectra is remaining unchanged upon its addition.

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“…TCES can compensate for this drawback by storing heat through a reversible endothermic chemical reaction and releasing the stored heat through a reversible exothermic reaction, when and where the heat is required. Another advantage of TCES is its high energy density compared with sensible or latent heat storage [6]. Simulation methods of a concentrated solar plant in a combined cycle with TCES suggest that the facility's energy efficiency can be improved by more than 45 percent [7].…”

Section: Introductionmentioning

confidence: 99%

The Potential Use of Fly Ash from the Pulp and Paper Industry as Thermochemical Energy and CO2 Storage Material

et al. 2021

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As a part of our research in the field of thermochemical energy storage, this study aims to investigate the potential of three fly ash samples derived from the fluidized bed reactors of three different pulp and paper plants in Austria for their use as thermochemical energy (TCES) and CO2 storage materials. The selected samples were analyzed by different physical and chemical analytical techniques such as X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), particle size distribution (PSD), scanning electron microscopy (SEM), inductively coupled plasma atomic emission spectroscopy (ICP-OES), and simultaneous thermal analysis (STA) under different atmospheres (N2, CO2, and H2O/CO2). To evaluate the environmental impact, leaching tests were also performed. The amount of CaO as a promising candidate for TCES was verified by XRF analysis, which was in the range of 25–63% (w/w). XRD results indicate that the CaO lies as free lime (3–32%), calcite (21–29%), and silicate in all fly ash samples. The results of STA show that all fly ash samples could fulfill the requirements for TCES (i.e., charging and discharging). A cycling stability test of three cycles was demonstrated for all samples which indicates a reduction of conversion in the first three reaction cycles. The energy content of the examined samples was up to 504 kJ/kg according to the STA results. More energy (~1090 kJ/kg) in the first discharging step in the CO2/H2O atmosphere could be released through two kinds of fly ash samples due to the already existing free lime (CaO) in those samples. The CO2 storage capacity of these fly ash samples ranged between 18 and 110 kg per ton of fly ash, based on the direct and dry method. The leaching tests showed that all heavy metals were below the limit values of the Austrian landfill ordinance. It is viable to say that the valorization of fly ash from the pulp and paper industries via TCES and CO2 storage is plausible. However, further investigations such as cycling stability improvement, system integration and a life cycle assessment (LCA) still need to be conducted.

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Boric Acid: A High Potential Candidate for Thermochemical Energy Storage

Cited by 29 publications

References 21 publications

Thermal Stability and Flammability of Epoxy Composites Filled with Multi-Walled Carbon Nanotubes, Boric Acid, and Sodium Bicarbonate

Thermal Stability and Flammability of Epoxy Composites Filled with Multi-Walled Carbon Nanotubes, Boric Acid, and Sodium Bicarbonate

Characterization Studies on Calcium Borate Compound Modified by ZnCO3, CaCO3 and Fructose

The Potential Use of Fly Ash from the Pulp and Paper Industry as Thermochemical Energy and CO2 Storage Material

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