Chemical composition of plasma of dielectric barrier discharge at atmospheric pressure with a liquid electrode

Bobkova, E. S.; Khodor, Ya. V.; Kornilova, O. N.; Рыбкин, В. В.

doi:10.1134/s0018151x14030055

Cited by 27 publications

(5 citation statements)

References 39 publications

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“…1 are described well by this relation ship with R 2 = 0.95-0.98 and rate constants of 0.059 ± 0.003, 0.064 ± 0.006, 0.096 ± 0.007, and 0.136 ± 0.012 s -1 at discharge powers of 0.4, 1.2, 2.1, and 4 W, respectively. The increase in the rate constants with increasing power is not surprising, since our study [21] devoted to the simulation of the gas phase of such a reactor has revealed that an increase in power leads to an increase in the concentration of all active plasma species. Note that the rate constant found in [13] for direct current (40 mA) discharge in air was an order of magnitude lower to be (4.78 ± 0.75) × 10 -3 s -1 .…”

Section: Resultsmentioning

confidence: 77%

Influence of parameters of oxygen atmospheric-pressure dielectric barrier discharge on the degradation kinetics of sulfonol in water

et al. 2015

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The kinetics of the degradation of Sulfonol and the formation of its degradation products by the action of oxygen atmospheric pressure dielectric barrier discharge on an aqueous solution at discharge pow ers of 0.4-4 W have been measured. It has been shown that the degradation products are carboxylic acids and aldehydes in the liquid phase and carbon dioxide in the gas phase. The energy efficiency of the degradation has been found to be (4.4-12.7) × 10 -3 molecule per 100 eV of input energy. Mechanisms for the processes have been proposed.

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Section: Resultsmentioning

confidence: 77%

Influence of parameters of oxygen atmospheric-pressure dielectric barrier discharge on the degradation kinetics of sulfonol in water

et al. 2015

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“…5). This result is quite expected, since an increase in power leads to an increase in the rates of formation of almost all active particles, as well as the average energy and concentration of electrons [34].…”

Section: Resultsmentioning

confidence: 79%

Destruction of 2,4-dichlorophenol vapor in a process involving the combined action of DBD in oxygen and a catalyst

Lapshova,

Gordina,

Kvitkova

et al. 2024

Preprint

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In this work, the process of decomposition of 2,4-dichlorophenol (2,4-DCP) vapor under the influence of atmospheric pressure DBD in oxygen was studied. The studies were carried out in two modes: with a catalyst (natural vermiculite doped with zirconium) and without it. A number of basic characteristics of the catalyst were assessed. The rates and effective rate constants of sorption processes, as well as decomposition processes in plasma and plasma-catalytic systems, were determined. Based on these data, the energy efficiency of the decomposition process was calculated. The data obtained suggested that the initial stage of decomposition is the reaction of interaction of electrons with pollutant molecules. The catalyst has been shown to speed up the decomposition process, increase energy efficiency and the conversion of 2,4-DCP to CO2 molecules, and prevent the formation of condensed products on the reactor walls. The work estimates the carbon and chlorine balances before and after treatment, which reach a maximum of 99 and 60%, respectively. It was also shown that the catalyst retains its activity for at least 7 hours of continuous operation.

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“…Dielectric barrier discharges (DBD) caused the following changes in the infrared spectra of ilmenite: there was an increase in the relative intensities of the lines corresponding to vibrations of Ti−O bonds in TiO6−octahedra. The relative intensities of the lines of −O−O− peroxo groups grew as well, due likely to the oxidation of the mineral surfaces under the action of products (e.g., O3, H2O2, NO, N2O [15,21]) of DBD low-temperature plasma (LPT). As the duration of treatment (ttreat) grew, so did the intensity of the lines associated with water molecules adsorbed on the mineral surfaces.…”

Section: Resultsmentioning

confidence: 99%

High-power nanosecond electromagnetic pulses and dielectric barrier discharge in air consequences on structural and structure sensitive properties of ilmenite surface

Bunin¹,

Anashkina²

2022

8th International Congress on Energy Fluxes and Radiation Effects

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The paper presents the results of experimental studies on the influence of two types of nonequilibrium electrical discharges (high-power nanosecond electromagnetic pulse (HPEMP) and dielectric barrier discharges (DBD) in air at atmospheric pressure) have on the surface morphology, microhardness, and physicochemical properties of natural ilmenite (Juina deposit of Brazil). Scanning electron microscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FTIR), microhardness testing, contact angles of surface wetting, and streaming potentials are used to examine the morphology, defects, chemical composition of ilmenite surfaces, and its structure sensitive properties. Using FTIR, we established, the following possible mechanisms of the nonthermal effect of HPEMP and DBD low temperature plasma irradiation, which modify the structural state of ilmenite surfaces: (i) the transformation (destruction) of the mineral’s crystalline structure; (ii) the electrical disintegration and removal of fine films of iron oxides (hydroxides) from the ilmenite surfaces, and (iii) the subsequent hydroxylation and/or oxidation of Fe2+ to Fe3+ iron ions on the surfaces, due to the effect of the products of microdischarge plasmas. Advantages of using brief energy treatments (ttreat = 10–30 s) to modify the structural-chemical state of ilmenite surfaces and the physicochemical properties of mineral in order to improve the efficiency of processing complex titanium ores are shown. Keywords: ilmenite, high-power nanosecond electromagnetic pulses, dielectric barrier discharge, surface, microscopy, spectroscopy, microhardness, electrokinetic potential, contact angle.

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Chemical composition of plasma of dielectric barrier discharge at atmospheric pressure with a liquid electrode

Cited by 27 publications

References 39 publications

Influence of parameters of oxygen atmospheric-pressure dielectric barrier discharge on the degradation kinetics of sulfonol in water

Influence of parameters of oxygen atmospheric-pressure dielectric barrier discharge on the degradation kinetics of sulfonol in water

Destruction of 2,4-dichlorophenol vapor in a process involving the combined action of DBD in oxygen and a catalyst

High-power nanosecond electromagnetic pulses and dielectric barrier discharge in air consequences on structural and structure sensitive properties of ilmenite surface

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