The reaction of OH with H at elevated temperatures

Lundström, T.; Christensen, H.; Sehested, Κ.

doi:10.1016/s0969-806x(01)00439-x

Cited by 14 publications

(8 citation statements)

References 11 publications

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“…This reaction has been studied by Lundstrom et al 31 and Buxton and Elliot. 32 Lundstrom et al 31 studied this reaction at bar between 5 and 233°C at pH = 2 ( Figure 5).…”

Section: Figurementioning

confidence: 96%

“…32 Lundstrom et al 31 studied this reaction at bar between 5 and 233°C at pH = 2 ( Figure 5). They reported an activation energy of 8.2 ± 0.4 kJ/mol, 31 close to our activation energy, 11 kJ mol -1 .…”

Section: Figurementioning

confidence: 99%

“…The experimental data from Lundstrom et al 31 and Buxton & Elliot 32 , along with our fit of k pre to the experimental data and its extrapolation to high temperatures for the reaction R7: H + OH → H 2 O. A pressure of 250 bar was used.…”

Section: Figurementioning

confidence: 99%

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Prediction of rate constants of important chemical reactions in water radiation chemistry in sub and supercritical water – non-equilibrium reactions

2018

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The rate constants for reactions involved in the radiolysis of water under relevant thermodynamic conditions in supercritical water-cooled reactors are estimated for inputs in simulations of the radiation chemistry in Generation IV nuclear reactors. We have discussed the mechanism of each chemical reaction with a focus on non-equilibrium reactions. We found most of the reactions are activation controlled above the critical point and that the rate constants are not significantly pressure dependent below 300 °C. This work will aid industry with developing chemical control strategies to suppress the concentration of eroding species.

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“…This reaction has been studied by Lundstrom et al 31 and Buxton and Elliot. 32 Lundstrom et al 31 studied this reaction at bar between 5 and 233°C at pH = 2 ( Figure 5).…”

Section: Figurementioning

confidence: 96%

Section: Figurementioning

confidence: 99%

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Prediction of rate constants of important chemical reactions in water radiation chemistry in sub and supercritical water – non-equilibrium reactions

2018

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“…In recent years, rate constants for several vital reactions have been determined. [1][2][3][4][5][6] In our continuing study of high-temperature and pressure water radiation chemistry, we have reexamined the very unusual reaction of the hydrogen atom (H • ) with the hydroxide ion (OH -) in the 100-300 °C temperature range.…”

Section: Introductionmentioning

confidence: 99%

“…To make predictions of the radiation-induced chemistry in the primary heat transport system of nuclear reactors, it is necessary to understand the kinetics of many important reactions over the range of reactor operating temperatures. In recent years, rate constants for several vital reactions have been determined. − In our continuing study of high-temperature and pressure water radiation chemistry, we have reexamined the very unusual reaction of the hydrogen atom (H • ) with the hydroxide ion (OH - ) in the 100−300 °C temperature range.…”

Section: Introductionmentioning

confidence: 99%

Reaction of Hydrogen Atoms with Hydroxide Ions in High-Temperature and High-Pressure Water

2005

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The rate constant for the reaction of hydrogen atoms (H(*)) with hydroxide ions (OH(-)) in aqueous solution has been measured from 100 to 300 degrees C by direct measurement of the hydrated electron ((e(-))(aq)) product growth rate. In combining these measurements with previous results, the reaction is observed to display Arrhenius behavior in two separate temperature regions, 3-100 and 100-330 degrees C, where the data above 100 degrees C show an obvious decrease in activation energy from 38.2 +/- 0.6 to 25.4 +/- 0.8 kJ mol(-1). The value of the rate constant is smaller than that estimated previously in the 200-300 degrees C range. The very unusual activation energy behavior of the forward and backward reactions is discussed in the context of transition state theory.

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Application of Radiation Chemistry to Some Selected Technological Issues Related to the Development of Nuclear Energy

2016

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The most important contributions of radiation chemistry to some selected technological issues related to water-cooled reactors, reprocessing of spent nuclear fuel and high-level radioactive wastes, and fuel evolution during final radioactive waste disposal are highlighted. Chemical reactions occurring at the operating temperatures and pressures of reactors and involving primary transients and stable products from water radiolysis are presented and discussed in terms of the kinetic parameters and radiation chemical yields. The knowledge of these parameters is essential since they serve as input data to the models of water radiolysis in the primary loop of light water reactors and super critical water reactors. Selected features of water radiolysis in heterogeneous systems, such as aqueous nanoparticle suspensions and slurries, ceramic oxides surfaces, nanoporous, and cement-based materials, are discussed. They are of particular concern in the primary cooling loops in nuclear reactors and long-term storage of nuclear waste in geological repositories. This also includes radiation-induced processes related to corrosion of cladding materials and copper-coated iron canisters, dissolution of spent nuclear fuel, and changes of bentonite clays properties. Radiation-induced processes affecting stability of solvents and solvent extraction ligands as well oxidation states of actinide metal ions during recycling of the spent nuclear fuel are also briefly summarized.

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The reaction of OH with H at elevated temperatures

Cited by 14 publications

References 11 publications

Prediction of rate constants of important chemical reactions in water radiation chemistry in sub and supercritical water – non-equilibrium reactions

Prediction of rate constants of important chemical reactions in water radiation chemistry in sub and supercritical water – non-equilibrium reactions

Reaction of Hydrogen Atoms with Hydroxide Ions in High-Temperature and High-Pressure Water

Application of Radiation Chemistry to Some Selected Technological Issues Related to the Development of Nuclear Energy

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