A thermodynamic and kinetic study of the de- and rehydration of Ca(OH)2 at high H2O partial pressures for thermo-chemical heat storage

Schaube, Franziska; Koch, Lisa; Wörner, Antje; Müller‐Steinhagen, Hans

doi:10.1016/j.tca.2012.03.003

Cited by 260 publications

(175 citation statements)

References 30 publications

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“…The dehydration data from Schaube et al (2012) is in good agreement with other literature data, and was therefore used as the primary source of calcium oxide hydration/dehydration equilibrium in this study.…”

Section: Thermodynamic Analysissupporting

confidence: 79%

“…The reaction enthalpy is 104.4 kJ/mol (Schaube et al 2012). The temperature-pressure diagram is shown in Figure 4 (Hasatani 1992).…”

Section: High Output Temperature (773 K+)mentioning

confidence: 99%

“…Three literature sources with applicable property data were obtained (Samms and Evans 1968;Schaube 2011;Schaube et al 2012). The calcium oxide hydration/dehydration reaction equilibrium temperature versus pressure data from each of these sources was reproduced in Figure 7, which projects these data onto a benchmark plot of equilibrium readings to verify the mathematical expressions used in the calculations.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…The calcium oxide hydration/dehydration reaction equilibrium temperature versus pressure data from each of these sources was reproduced in Figure 7, which projects these data onto a benchmark plot of equilibrium readings to verify the mathematical expressions used in the calculations. The equilibrium data mathematical relationships utilized in this work are plotted as a color overlay to the original plot from Schaube et al (2012), which is reproduced in black lines and symbols. The expression for the calcium oxide dehydration reaction temperature-pressure dependence was reported as:…”

Section: Thermodynamic Analysismentioning

confidence: 99%

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Application of Chemical Heat Pumps for Temperature

Sabharwall¹,

Wendt²,

Utgikar³

2013

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SUMMARYA chemical heat pump (ChHP) system is a key component of the nuclear hybrid energy systems that can amplify the temperature of conventional Light Water Reactors (LWRs). The high-temperature heat obtained can be utilized for producing synthetic transportation fuels. The overall goal of this project was to analyze and develop a ChHP that can perform the required temperature amplification to deliver high-temperature heat necessary for the above application, and thus contribute significantly to energy security and affordability of the nation.

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Section: Thermodynamic Analysissupporting

confidence: 79%

“…The reaction enthalpy is 104.4 kJ/mol (Schaube et al 2012). The temperature-pressure diagram is shown in Figure 4 (Hasatani 1992).…”

Section: High Output Temperature (773 K+)mentioning

confidence: 99%

Section: Thermodynamic Analysismentioning

confidence: 99%

Section: Thermodynamic Analysismentioning

confidence: 99%

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Application of Chemical Heat Pumps for Temperature

Sabharwall¹,

Wendt²,

Utgikar³

2013

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“…Compared with MgO/Mg(OH) 2 and CaO/CaCO 3 , the CaO/Ca(OH) 2 reaction exhibits superior repetitive durability, as constant reaction rates and final conversions have been confirmed over 50 -100 repetitions using small-scale thermogravimetric analysis [5] [6] [7]. However, durability remains problematic, as various factors affect the sintering rate, including the state of the packed bed and the charging/discharging conditions, such as packing density, particle size, temperature, atmospheric gas species, gas pressure, and reaction time.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Durability and Reactivation of Thermochemical Heat Storage Driven by the CaO/Ca(OH)<sub>2</sub> Reversible Reaction

Kuwata¹,

Esaki²,

Iwase³

et al. 2017

MSCE

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Thermochemical heat storage is a promising technology for improving thermal energy efficiency. To investigate the durability of the CaO/Ca(OH) 2 reaction and develop a reactivation method, repetitive charging/discharging operation of a packed bed reactor with a thick packed bed was conducted, and variations in the discharging behavior, final conversion, and reactant activity were investigated. Owing to the formation of a deactivated sintered reactant block, the discharging time halved and the final conversion ratio decreased by the 53rd discharging operation. To enhance durability, a reactivation method using high-pressure vapor was implemented during the 54th discharging operation. Following reactivation, the final conversion increased 15%, and the discharging time tripled when compared with the discharging operation before reactivation, confirming the success of this simple reactivation method.

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Synthesis of Glycerol Carbonate from Glycerol and CO₂ Using CaO as a Dehydrating Agent

et al. 2022

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Glycerol carbonate, a high value-added chemical, is produced from glycerol, a surplus biomass byproduct of biodiesel production, and carbon dioxide, an inexhaustible raw material. In this study, calcium oxide (CaO) was used as a regenerable dehydrating agent, and Zn(OTf) 2 /1,10-phenanthroline was used as the catalyst. Stirring with a common magnetic stirrer bar was found to be unsuitable for the reaction, owing to the solidification of calcium components after dehydration. However, mechanical stirring effectively resolves this issue and produces a high yield. The only byproduct of the reaction is H 2 O, since CaO is regenerable. In addition, because the carbon atoms of biomass-derived glycerol are obtained from CO 2 fixed by plant photosynthesis, all the carbon atoms of glycerol carbonate can be said to be derived from CO 2 . This approach can be used for the syntheses of other cyclic carbonates as well.

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A thermodynamic and kinetic study of the de- and rehydration of Ca(OH)2 at high H2O partial pressures for thermo-chemical heat storage

Cited by 260 publications

References 30 publications

Application of Chemical Heat Pumps for Temperature

Application of Chemical Heat Pumps for Temperature

Long-Term Durability and Reactivation of Thermochemical Heat Storage Driven by the CaO/Ca(OH)<sub>2</sub> Reversible Reaction

Synthesis of Glycerol Carbonate from Glycerol and CO₂ Using CaO as a Dehydrating Agent

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A thermodynamic and kinetic study of the de- and rehydration of Ca(OH)2 at high H2O partial pressures for thermo-chemical heat storage

Cited by 260 publications

References 30 publications

Application of Chemical Heat Pumps for Temperature

Application of Chemical Heat Pumps for Temperature

Long-Term Durability and Reactivation of Thermochemical Heat Storage Driven by the CaO/Ca(OH)&lt;sub&gt;2&lt;/sub&gt; Reversible Reaction

Synthesis of Glycerol Carbonate from Glycerol and CO2 Using CaO as a Dehydrating Agent

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Product

Resources

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Long-Term Durability and Reactivation of Thermochemical Heat Storage Driven by the CaO/Ca(OH)<sub>2</sub> Reversible Reaction

Synthesis of Glycerol Carbonate from Glycerol and CO₂ Using CaO as a Dehydrating Agent