Mechanism of hydrogen peroxide formation in electrolytic-cathode atmospheric-pressure direct-current discharge

Bobkova, E. S.; Шикова, Т. Г.; Grinevich, V. I.; Рыбкин, В. В.

doi:10.1134/s0018143912010079

Cited by 35 publications

(25 citation statements)

References 16 publications

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“…Indeed, formation of hydrogen peroxide in a concentration of *6 mmol/l was discovered for the discharge under study in [18,19]. With regard to other particles, we do not know of any studies where such data were obtained for DC discharges in air.…”

Section: Kinetic Model Kinetic Model For Aqueous Solutionsmentioning

confidence: 91%

“…Afterwards, the reactions (1-42) were successfully used in articles [18,19] for the description of hydrogen peroxide formation for the same discharge as presented here. For these reasons we used for the initiation reactions (1, 2, 40 of Table 1) the rate constants obtained in [18,19]. The rate constants depend on discharge current (inputted power) and they increase with inputted power growth.…”

Section: Kinetic Model Kinetic Model For Aqueous Solutionsmentioning

confidence: 99%

“…But we think that such model can reveal the main features of kinetics observed. For this we used the rate constants of initiation reactions (1, 2, 40) which were already fitted to describe the kinetics of hydrogen peroxide formation in articles [16,18] for the same discharge as presented here. Actually, given rate constants are effective and they take into account the possible processes of mass-transfer.…”

Section: Kinetic Model Kinetic Model For Aqueous Solutionsmentioning

confidence: 99%

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Kinetics and Mechanism of Cr(VI) Reduction in a Water Cathode Induced by Atmospheric Pressure DC Discharge in Air

Shutov

Sungurova

Choukourov

et al. 2016

Plasma Chem Plasma Process

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The process of reduction of Cr 6? ions (solution of potassium dichromate, K 2 Cr 2 O 7 ) in a water cathode was studied during a DC discharge in air. The concentration range of Cr 6? was (5.7-19) 910 -5 mol/l and discharge current range was 20-80 mA. Cr 6? ions were shown to be reversibly reduced under a discharge action. The equilibrium degree of reduction increased with increasing initial concentration of the solution at fixed discharge current. At fixed initial concentration the reduction degree increased with increasing discharge current. The reduction degrees so obtained were 0.34-0.84. A kinetic scheme of the processes taking place in a solution was proposed. The calculated data obtained as a result of application of this scheme described well the experimental results on Cr 6? kinetics. The main processes of Cr 6? reduction and Cr 3? oxidation were revealed. HO 2 Á radicals and hydrogen peroxide were shown to be responsible for Cr 6? reduction whereas Á OH radicals and O 2 molecules provide the reverse process of Cr 3? oxidation to Cr 6? . The mechanism of action of phenol additives improving the process efficiency is discussed. The efficiency of phenol action as a radical scavenger was shown to be determined with its mass-transfer to the reaction area rather than chemical reaction rate.

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Section: Kinetic Model Kinetic Model For Aqueous Solutionsmentioning

confidence: 91%

Section: Kinetic Model Kinetic Model For Aqueous Solutionsmentioning

confidence: 99%

Section: Kinetic Model Kinetic Model For Aqueous Solutionsmentioning

confidence: 99%

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Kinetics and Mechanism of Cr(VI) Reduction in a Water Cathode Induced by Atmospheric Pressure DC Discharge in Air

Shutov

Sungurova

Choukourov

et al. 2016

Plasma Chem Plasma Process

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“…In a solution, V 8kT/πM the concentration has to be less. In a study [33] devoted to modeling the chemical process kinetics in our discharge type under the same conditions, •OH concentration was in the range of (0.01-0.001) μmol/l. The comparison of these data shows that the direct ozone contribution cannot be too high.…”

Section: H 5 Oh+•oh→h 2 O+•c 6 H 4 Oh •C 6 H 4 Oh+•oh→c 6 H 4 (Omentioning

confidence: 99%

Phenol decomposition in water cathode of DC atmospheric pressure discharge in air

Bobkova

Krasnov

Sungurova

et al. 2016

Korean J. Chem. Eng.

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We studied phenol decomposition in aqueous solution under the action of DC discharge at atmospheric pressure in air. The decomposition efficiency was 0.017 molecules per 100 eV. When the kinetics of forming destruction products was studied in detail, the peculiarities of air plasma action were revealed for the first time. Plasma action not only results in the formation of oxygen-containing products, which are usually formed under oxygen plasma action (hydroxyhenols, carboxylic acids, aldehydes), but also the formation of nitro phenols. The treatment is accompanied by hydrogen peroxide formation, a pH decrease, and nitric and nitrous acids formation. We also discussed the possible mechanism of the processes and the role of some active species in chemical transformations after determining some parameters of the discharge.

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“…As the building blocks, the generated OH radicals combination contributes to the main process of H 2 O 2 formation in plasma-water interactions. In addition, other less probable pathways such as OH + H 2 O * → H 2 O 2 + H2728 are also possible. In fact, there exist many reports on the H 2 O 2 formation by discharge plasma operated over and inside aqueous solutions272829303132333435.…”

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confidence: 99%

Direct synthesis of hydrogen peroxide from plasma-water interactions

Liu

Chen

et al. 2016

Sci Rep

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Hydrogen peroxide (H2O2) is usually considered to be an important reagent in green chemistry since water is the only by-product in H2O2 involved oxidation reactions. Early studies show that direct synthesis of H2O2 by plasma-water interactions is possible, while the factors affecting the H2O2 production in this method remain unclear. Herein, we present a study on the H2O2 synthesis by atmospheric pressure plasma-water interactions. The results indicate that the most important factors for the H2O2 production are the processes taking place at the plasma-water interface, including sputtering, electric field induced hydrated ion emission, and evaporation. The H2O2 production rate reaches ~1200 μmol/h when the liquid cathode is purified water or an aqueous solution of NaCl with an initial conductivity of 10500 μS cm−1.

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Mechanism of hydrogen peroxide formation in electrolytic-cathode atmospheric-pressure direct-current discharge

Cited by 35 publications

References 16 publications

Kinetics and Mechanism of Cr(VI) Reduction in a Water Cathode Induced by Atmospheric Pressure DC Discharge in Air

Kinetics and Mechanism of Cr(VI) Reduction in a Water Cathode Induced by Atmospheric Pressure DC Discharge in Air

Phenol decomposition in water cathode of DC atmospheric pressure discharge in air

Direct synthesis of hydrogen peroxide from plasma-water interactions

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