Thermal Decomposition of Hydrogen Peroxide and Its Effect on Reactor Water Monitoring of Boiling Water Reactors

Takagi, Junichi; Ishigure, Kenkichi

doi:10.13182/nse85-a18191

Cited by 86 publications

(53 citation statements)

References 14 publications

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“…In the aqueous phase the Arrhenius parameters found in the present work are different from those found by Takagi and Ishigure (1985). Yet, the lower activation energy found in this study is counterbalanced by a higher preexponential factor.…”

Section: Reaction Mechanism Of H 0 Decompositioncontrasting

confidence: 99%

Hydrogen peroxide decomposition in supercritical water

1997

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Section: Reaction Mechanism Of H 0 Decompositioncontrasting

confidence: 99%

Hydrogen peroxide decomposition in supercritical water

1997

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“…The main reaction leading to the formation of H 2 O 2 by discharge in air bubbles is dimerization of OH radical whereas decomposition is mainly due to thermal destruction as follows (20,26): Figure 3 at a H 2 O 2 concentration of 0.7 mmol/L. At steady-state regime observed in experiemts, the rate of H 2 O 2 destruction (depending on k 2 ) is equal to the rate of formation (depending on k 1 ) which means that thermal destruction of H 2 O 2 plays an important role in DC mode.…”

Section: Tg=2500-5000k (34)mentioning

confidence: 99%

Hydrogen Peroxide Generation by DC and Pulsed Underwater Discharge in Air Bubbles

Xiong

Nikiforov

Vanraes

et al. 2012

Journal of Advanced Oxidation Technologies

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Abstract:The generation of H 2 O 2 in underwater discharge in air bubbles is studied with consideration of the influence of electrodes polarity, input power, solution conductivity and the inter-electrode distance. The efficiency of hydrogen peroxide generation strongly depends on the polarity, input power and the inter-electrode distance. Discharges in air bubbles with water as a cathode have significantly higher energy yield of hydrogen peroxide in comparison with negative DC or pulsed discharges. The generation of hydrogen peroxide by DC discharge increases with decrease in the inter-electrode distance, but it is opposite for pulsed discharges. Different efficiency of H 2 O 2 production is explained based on physical processes which result to formation of OH radicals.

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“…Above the critical pressure of water (22.1 MPa), the maximum operating temperature of the SFR is 650°C . At pressures of only tens of atmospheres (1)(2)(3)(4)(5), however, the reactor may be operated safely at 750 'C. In order to provide an intermediate situation (i.e., between the high temperature, atmospheric pressure oxidation of anisole in a nitrogen bath and the low temperature oxidation of anisole in supercritical water) the initial SFR experiments will be performed at the same nominal temperature as the Princeton work and at high (1.0-6.0 MPa), but subcritical, pressures.…”

Section: Resultsmentioning

confidence: 99%

Kinetics of Supercritical Water Oxidation. SERDP Compliance Technical Thrust Area

Rice¹,

Steeper²,

Hanush³

et al. 1996

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Washington Headquarters Services, Directorate This project consists of experiments and theoretical modeling designed to improve our understanding of the detailed chemical kinetics of supercritical water oxidation processes. The objective of the four-year project is to develop working models that accurately predict the oxidation rates and mechanisms for a variety of key organic species over the range of temperatures and pressures important for industrial applications. Our examination of reaction kinetics in supercritical water undertakes in situ measurements of reactants, intermediates, and products using optical spectroscopic techniques, primarily Raman spectroscopy. Our focus is to measure the primary oxidation steps that occur in the oxidation of methanol, higher alcohols, methylene chloride, aromatics, and some simple organic compounds containing nitro groups. We are placing special emphasis on identifying reaction steps that involve hydroxyl radicals, hydroperoxyl radicals, and hydrogen peroxide. The measurements are conducted in two optically accessible reactors located at Sandia's Combustion Research Facility (CRF), the supercritical flow reactor (SFR) and the supercritical constant volume reactor, designed to operate at temperatures and pressures up to 600 °C and 500 MPa. The combination of these two reactors permits reaction rate measurements ranging from 0.1 s to many hours. Project description This project consists of experiments and theoretical modeling designed to improve our understanding of the detailed chemical kinetics of supercritical water oxidation (SCWO) processes. The objective of the four-year project is to develop working models that accurately predict the oxidation rates and mechanisms for a variety of key organic species over the range of temperatures and pressures important for industrial applications. Our examination of reaction kinetics in supercritical water undertakes in situ measurements of reactants, intermediates, and products using optical spectroscopic techniques, primarily Raman spectroscopy. Our focus is to measure the primary oxidation steps that occur in the oxidation of methanol, higher alcohols, methylene chloride, aromatics, and some simple organic compounds containing nitro groups. We are placing special emphasis on identifying reaction steps that involve hydroxyl radicals, hydroperoxyl radicals, and hydrogen peroxide. The measurements are conducted in two optically accessible reactors located at Sandia's Combustion Research Facility (CRF), the supercritical flow reactor (SFR) and the supercritical constant volume reactor (SCVR), designed t...

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Thermal Decomposition of Hydrogen Peroxide and Its Effect on Reactor Water Monitoring of Boiling Water Reactors

Cited by 86 publications

References 14 publications

Hydrogen peroxide decomposition in supercritical water

Hydrogen peroxide decomposition in supercritical water

Hydrogen Peroxide Generation by DC and Pulsed Underwater Discharge in Air Bubbles

Kinetics of Supercritical Water Oxidation. SERDP Compliance Technical Thrust Area

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