Experimental and modeling study of the oxidation of acetaldehyde in an atmospheric-pressure pulsed corona discharge

Klett, Cornelis; Touchard, Sylvain; Vega‐González, Arlette; Rédolfi, M.; Bonnin, Xavier; Hassouni, K.; Duten, Xavier

doi:10.1088/0963-0252/21/4/045001

Cited by 26 publications

(22 citation statements)

References 33 publications

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“…Modelling of atmospheric-pressure air plasmas in the context of plasma remediation of toxic gases [28][29][30], plasma aided combustion [31][32][33] and aeronautical flow control [34] has significantly improved our understanding of this complex plasma chemistry. The current understanding of dry-air plasmas was discussed in modelling by Kossyi et al [35].…”

Section: Introductionmentioning

confidence: 99%

Reactive fluxes delivered by dielectric barrier discharge filaments to slightly wounded skin

Babaeva

Kushner²

2012

J. Phys. D: Appl. Phys.

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The application of atmospheric-pressure plasmas to human tissue has been shown to have therapeutic effects for wound healing and in treatment of skin diseases. In this paper, we report on a computational study of the intersection of plasma filaments in a dielectric barrier discharge (DBD) with a small wound in human skin in the context of plasma medicine. The wound is represented as a small cut in the epidermal layer of cells. Intracellular structures and their electrical properties were incorporated into the two-dimensional computational mesh in order to self-consistently couple gas phase plasma transport with the charging of the surface of the wound. We quantify the fluxes of reactive oxygen and nitrogen species, ions and photons produced in or diffusing into the wound as might occur during the first few discharge pulses of treatment. Comparison is made to fluxes predicted by global modelling. We show that the relative location of the plasma filament with respect to the wound is important on plasma time scales (ns) for ions and photons, and for radicals directly produced by electron impact processes. On the longer-term diffusion time scales (ms) the position of the plasma filament relative to the wound is not so critical. For typical DBD conditions, the magnitude of these fluxes to the cellular surfaces corresponds to fluences of radicals nearly equal to the surface site density. These results imply that the biological reactivity is limited by reaction probabilities and not the availability of radical fluxes.

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Section: Introductionmentioning

confidence: 99%

Reactive fluxes delivered by dielectric barrier discharge filaments to slightly wounded skin

Babaeva

Kushner²

2012

J. Phys. D: Appl. Phys.

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“…It is important to bear in mind that some of the species identified on the catalyst surface after the PDC process can also be formed directly in the gas phase. Indeed, gas-phase acetaldehyde decomposition by NTP can lead to the formation of methoxy radical, as well as acetone, acetic acid and formaldehyde [78], which can subsequently adsorb on the surface.…”

Section: Surface Species Formed During the Pdc Process: Formation Mecmentioning

confidence: 99%

Plasma-Catalysis for Volatile Organic Compounds Decomposition: Complexity of the Reaction Pathways during Acetaldehyde Removal

2020

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Acetaldehyde removal was carried out using non-thermal plasma (NTP) at 150 J·L−1, and plasma-driven catalysis (PDC) using Ag/TiO2/SiO2, at three different input energies—70, 350 and 1150 J·L−1. For the experimental configuration used, the PDC process showed better results in acetaldehyde (CH3CHO) degradation. At the exit of the reactor, for both processes and for all the used energies, the same intermediates in CH3CHO decomposition were identified, except for acetone which was only produced in the PDC process. In order to contribute to a better understanding of the synergistic effect between the plasma and the catalyst, acetaldehyde/catalyst surface interactions were studied by diffuse-reflectance infrared Fourier transform spectroscopy (DRIFTS). These measurements showed that different species such as acetate, formate, methoxy, ethoxy and formaldehyde are present on the surface, once it has been in contact with the plasma. A reaction pathway for CH3CHO degradation is proposed taking into account all the identified compounds in both the gas phase and the catalyst surface. It is very likely that in CH3CHO degradation the presence of methanol, one of the intermediates, combined with oxygen activation by silver atoms on the surface, are key elements in the performance of the PDC process.

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“…Those mechanisms are already known and have been used for the treatment of low concentrated volatile organic compound (VOC) at ppm levels [4,6,[28][29][30][31][32][33][34][35][36]. At high frequency (60 kHz), the increase of dielectric surface temperature reaches 200 • C and assists the surface cleaning.…”

Section: Cleaning Mechanismsmentioning

confidence: 99%

Self-cleaning, maintenance-free aerosol filter by non-thermal plasma at atmospheric pressure

Jidenko

Borra

2012

Journal of Hazardous Materials

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Two lab-scale self-cleaning filters based on dielectric barrier discharges in air at atmospheric pressure have been developed and tested. Experimental results on aerosol removal by charging and electro-collection are presented versus plasma and hydrodynamic parameters for monodisperse aerosol from 20 nm to 1.2 μm. For classical atmospheric aerosol, the average mass and number filtration efficiencies exceed 95% and 87%, respectively in the most penetrating size range (100-700 nm). The frequency of the applied voltage controls the amplitude of the oscillation of charged particle and can be adjusted to favour either filtration or cleaning. Low frequency (1 kHz) is suitable for electro-collection, while high frequency (60 kHz) is favourable for filter cleaning. Electrical characterization and filter efficiency are two indicators of the filter loading. The durations of both filtration step at maximal efficiency and cleaning step depends on the deposited mass, the surface input power and subsequent dielectric surface temperature.

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Experimental and modeling study of the oxidation of acetaldehyde in an atmospheric-pressure pulsed corona discharge

Cited by 26 publications

References 33 publications

Reactive fluxes delivered by dielectric barrier discharge filaments to slightly wounded skin

Reactive fluxes delivered by dielectric barrier discharge filaments to slightly wounded skin

Plasma-Catalysis for Volatile Organic Compounds Decomposition: Complexity of the Reaction Pathways during Acetaldehyde Removal

Self-cleaning, maintenance-free aerosol filter by non-thermal plasma at atmospheric pressure

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