769. The thermal dissociation of calcium hydroxide

Halstead, P. E.; Moore, A. E.

doi:10.1039/jr9570003873

Cited by 108 publications

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“…This is in agreement with the results from previous studies [30], in which the formation of anorthite in ceramic wares manufactured with fly ash and Ca(OH)z begins in the temperature range 1000-1100 0c. Although the raw materials used in this study do not contain Ca(OHh, which decomposes into (aO(s) (and H20(g)) at 512 O( [31]. the WS con tains calcite (CaC03), which also decomposes into CaO(s) and CO2(g) [32], and which could be consumed during the formation of anorthite at higher temperatures.…”

Section: Neralogy Resultsmentioning

confidence: 99%

Microstructure and mineralogy of lightweight aggregates produced from washing aggregate sludge, fly ash and used motor oil

González-Corrochano

Alonso-Azcárate

Rodas

et al. 2010

Cement and Concrete Composites

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Section: Neralogy Resultsmentioning

confidence: 99%

Microstructure and mineralogy of lightweight aggregates produced from washing aggregate sludge, fly ash and used motor oil

González-Corrochano

Alonso-Azcárate

Rodas

et al. 2010

Cement and Concrete Composites

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“…TCES using a calcium oxide/calcium hydroxide/water (CaO/Ca(OH) 2 /H 2 O) system has been studied by other researchers. The reaction formula used by the system, and its reaction enthalpy, Δ H r (kJ mol −1 ), are described in Equation 1 :

Ca {(OH)}_{2} ((), s) ⇌ CaO ((), s) + H_{2} normalO ((), g), Δ H_{r} = 104 kJ {mol}^{- 1} .

…”

Section: Introductionmentioning

confidence: 99%

Performance of thermochemical energy storage of a packed bed of calcium hydroxide pellets

et al. 2019

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Thermochemical energy storage (TCES) using reversible gas‐solid reactions is a promising technology owing to the high energy density and capability of long‐term storage. TCES using a calcium oxide/calcium hydroxide/water (CaO/Ca(OH)2/H2O) reaction system has attracted considerable attention because of the low material cost and environmental friendliness of the reactants. Previous experimental studies have focused on the TCES performances of packed beds of calcium oxide/calcium hydroxide powder. However, pelleted materials can be more favorable than powdered materials from a practical viewpoint. The aim of this study is to evaluate the performance of TCES of a packed bed of calcium oxide/calcium hydroxide pellets. In this work, a total of 60 g of calcium hydroxide pellets (diameter of 1.9 mm and length of 2‐10 mm) was evaluated using a 100‐W scale packed bed reactor. The heat storage density of the bed was 1.0 MJ L‐bed−1, and an average heat output rate of 0.71 kW L‐bed−1 was observed for the first 10 minutes under a hydration pressure of 84.6 kPa. The stability of the reaction conversion of the bed was demonstrated during 17 cycles of experiments.

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“…As one of the techniques, CaO/Ca(OH) 2 using their reversible hydration/ de-hydration reactions has been reported. 5) The reversible reaction is shown in Eq. (1).…”

Section: )3)mentioning

confidence: 99%

Synthesis and characterization of CaO@SiO<sub>2</sub> nanoparticle for chemical thermal storage

Yamashita

Fuji

2016

J. Ceram. Soc. Japan

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Preparation of CaO core-SiO 2 shell nanoparticles as a chemical thermal storage through hydration/de-hydration of CaO/ Ca(OH) 2 was proposed. Firstly, SiO 2 was coated on CaCO 3 template surface using solgel route and then the coreshell particles were heated at 700°C to form CaO@SiO 2 nanoparticle by de-carbonization. A thermal storage performance of the CaO@SiO 2 was confirmed by a thermogravimetry (TG) analysis and the result was compared with that of as-received CaCO 3 . The heating program was performed as following steps as (i) at 700°C for 30 min for de-carbonization under nitrogen (N 2 ) atmosphere, (ii) at room temperature for 60 min for hydration under water vapor, and (iii) at 500°C for de-hydration under N 2 . By repeating of (ii) hydration/(iii) de-hydration cycle, effect of the number of cycles on thermal storage ability was investigated. An efficiency of thermal storage was defined as difference in weight change between hydration/de-hydration reactions. For the as-received CaCO 3 nanoparticles, with increase in the number of cycles, the thermal storage performance gradually decreased. The microscopic results showed that the heating cycles induces coalescence of CaCO 3 nanoparticles and that decreases specific surface area. On the other hands, efficiency of thermal storage of CaO@SiO 2 didn't reach theoretical value because CaCO 3 didn't completely transform into CaO owing to SiO 2 's thermal insulation ability. By decreasing SiO 2 coating thickness, the thermal storage performance of CaO@SiO 2 was improved. The microscopic results showed that the SiO 2 coating prevented from coalescence of CaCO 3 nanoparticles.

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769. The thermal dissociation of calcium hydroxide

Abstract: Measurements are reported of the equilibrium pressure of the reaction CaO + H,O + Ca(OH), which, with those of previous workers, show that it reaches 760 mm. a t 512" c, and that the average heat of reaction over the range 300-510" is 24-9 kcal./mole.

Cited by 108 publications

References 0 publications

Microstructure and mineralogy of lightweight aggregates produced from washing aggregate sludge, fly ash and used motor oil

Microstructure and mineralogy of lightweight aggregates produced from washing aggregate sludge, fly ash and used motor oil

Performance of thermochemical energy storage of a packed bed of calcium hydroxide pellets

Synthesis and characterization of CaO@SiO<sub>2</sub> nanoparticle for chemical thermal storage

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