Effects of metastable atoms on breakdown voltage in Argon DBD

Yoshinaga, T.; Akashi, Hidetoshi

doi:10.1088/1742-6596/441/1/012013

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…The Ar–Bz mixed with the main Ar‐moisture stream at the inlet of R2 reactor contains high concentrations of moisture (~29,000 ppmv H 2 O [considering 90% of Ar with 100% RH]), which is responsible for the formation of reactive species such as • OH and • H, the respective precursors of H 2 O 2 and H 2 . The reactive species and the products in Ar–water vapor systems produced in reactor R1 through initially generated Ar‐associated transient species such as Ar * , Ar 2 * , Ar 3 * , Ar + , and Ar 2 + along with e − during DBD are given as follows:

{italice}^{-} + Ar \to (normalA normalr *) \to {Ar}^{+} + 2 {italice}^{-},

{italice}^{-} + {Ar}^{+} \to Ar * \to Ar + h υ,

Ar * + italicm normalA normalr \to ({Ar}_{italicm}^{*}); (m = 1 to 3),

{Ar}^{+} + n normalA normalr \to ({Ar}_{italicn}^{+}); (n = 1 to 2) .

…”

Section: Resultsmentioning

confidence: 99%

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Benzene transformation in two dielectric barrier discharge reactors having special arrangement

Dey

2019

Plasma Processes & Polymers

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Argon–benzene (Ar–Bz) gas phase plasma chemistry work is explored for benzene transformation employing the dielectric barrier discharge (DBD) cold plasma technique. To do so, experiments are carried out with two identical coaxial DBD reactors in serial‐type arrangements. The first carries moist Ar having 100% relative humidity (90% of total Ar flowing over water) and its outlet is mixed with Bz, which is saturated in the remaining 10% Ar at the inlet of the second reactor before plasma generation. This type of arrangement perhaps favors Bz transformation significantly for explicit products because the H2 generated in the first reactor as one of the major in situ products in the Ar‐moisture DBD system might facilitate chemical reduction of Bz to biphenyl in the second reactor during DBD. Conversely, H2O2, another product in Ar‐moisture discharge, enhances the yields of phenol. DBD outlet products, such as methane and leftover Bz, are analyzed and estimated with online gas chromatograph–flame ionization detector analysis, whereas H2 is analyzed with gas chromatograph–thermal conductivity detector. Additionally, the offline gas chromatograph–mass spectrometer analysis of acetone solutions of surface deposits obtained after discharge reveals the formation of phenol and biphenyl along with other products. The periodically analyzed data reveal that the generation of phenol, biphenyl, and CH4 relate directly to discharge duration and input moisture concentration.

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{italice}^{-} + Ar \to (normalA normalr *) \to {Ar}^{+} + 2 {italice}^{-},

{italice}^{-} + {Ar}^{+} \to Ar * \to Ar + h υ,

Ar * + italicm normalA normalr \to ({Ar}_{italicm}^{*}); (m = 1 to 3),

{Ar}^{+} + n normalA normalr \to ({Ar}_{italicn}^{+}); (n = 1 to 2) .

…”

Section: Resultsmentioning

confidence: 99%

“…• OH and • H, the respective precursors of H 2 O 2 and H 2 . The reactive species and the products in Ar-water vapor systems produced in reactor R1 through initially generated Ar-associated transient species such as Ar * , Ar Ar + , and Ar 2 + along with e −[23][24][25][26][27] during DBD are given as follows:…”

mentioning

confidence: 99%

Benzene transformation in two dielectric barrier discharge reactors having special arrangement

Dey

2019

Plasma Processes & Polymers

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Application of plasma for efficient H2 production: A realism of copper electrode in single dielectric barrier discharge reactor

2018

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Effective transformation of moisture into hydrogen in argon containing 100% relative humidity employing dielectric barrier discharge cold plasma is reported. The coaxial reactor with a common outer Pyrex tube having an inner diameter of 14 mm accompanied by a central electrode combination is employed for H2 generation through water splitting. Three different central electrodes such as Pyrex (double dielectric surfaces), copper (Cu), and stainless steel (SS) [single dielectric (SD) surface] are used separately, investigating the H2 production efficiency with the variation of gas residence time (GRT), electric field, working frequency, electrode surface, and discharge gas-gap (GG). Optimal electric fields 3.5, 1.7, and 1.3 kV mm−1 at 14.5 kHz are required for the highest H2 production at 45 s GRT for Pyrex, SS, and Cu reactors, respectively. The utmost H2 productions 2500 and 4500 ppmv are observed with 100 mm long, 4 mm GG and 290 mm long, 2 mm GG Cu SD reactors, respectively.

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Parameters affecting the H2 production and frequency gaps in Ar moisture dielectric barrier discharge

Dey

Nadkarni

Toley

et al. 2022

Journal of Applied Physics

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Dependency of H2 production and frequency gaps with working frequency, applied electric fields, discharge gas-gap (GG), and central electrode materials in Ar-moisture dielectric barrier discharge (DBD) non-thermal plasma is presented. H2 production during the transformation of moisture in an Ar carrier having 100% relative humidity employing DBD is monitored by gas chromatography with a thermal conductivity detector. Coaxial cylindrical reactors with an outer Pyrex tube (common for all reactors) accompanied by two different categories of central electrodes [Pyrex in double dielectric (DD) and bare metal, such as stainless steel or aluminum or copper (Cu) in single dielectric (SD) of different GGs], are used. A high-frequency (4–30 kHz) ac power supply is employed for plasma as well as H2 generations. Dissipated powers in reactors are measured under similar conditions that differ marginally between DD and SD reactors. The formation of •OH and Ar metastable species is observed in optical emission spectra confirming the free radical-based water-splitting reactions for H2 generation. Interestingly, the use of high frequency leads to various frequency gaps within the 4–30 kHz range where there is neither the generation of filamentary discharge nor the H2 formation. These frequency gaps vary with GGs and the type of central electrode materials used in DBD reactors. In addition, an increase in the applied voltage controls the frequency gaps under study. H2 production of ∼3600 ppmv obtained with the Cu-containing SD reactor translates to over 21% water conversion.

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Effects of metastable atoms on breakdown voltage in Argon DBD

Cited by 3 publications

References 14 publications

Benzene transformation in two dielectric barrier discharge reactors having special arrangement

Benzene transformation in two dielectric barrier discharge reactors having special arrangement

Application of plasma for efficient H2 production: A realism of copper electrode in single dielectric barrier discharge reactor

Parameters affecting the H2 production and frequency gaps in Ar moisture dielectric barrier discharge

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