Modeling of the plasma chemistry and plasma–surface interactions in reactive plasmas

Bogaerts, Annemie; Bie, Christophe De; Eckert, Maxie; Georgieva, Violeta; Martens, Tom; Neyts, Erik C.; Tinck, Stefan

doi:10.1351/pac-con-09-09-20

Cited by 23 publications

(5 citation statements)

References 25 publications

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“…4. These species are generated by radical coupling reactions in the plasma volume; this has been demonstrated previously in experimental [31,32] and simulated [33,34] results for CH 4 DBDs in the absence of active metal catalysts. Fig.…”

Section: Plasma Catalyst Reduction In Chsupporting

confidence: 52%

Plasma-assisted methane reduction of a NiO catalyst—Low temperature activation of methane and formation of carbon nanofibres

Gallon

Twigg

et al. 2011

Applied Catalysis B: Environmental

107

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a b s t r a c tThe low temperature reduction of a NiO catalyst by CH 4 was performed in a coaxial double dielectric barrier discharge (DBD) reactor for the first time. The reduction involves active surface carbon which is produced via plasma decomposition of CH 4 . On the reduced Ni catalyst, activation of CH 4 and its fragments to form H 2 and carbon nanofibres occurred at 330 • C. CH 4 conversions of 37% were achieved in the plasmacatalytic reaction at atmospheric pressure, with 99% selectivity towards H 2 and solid carbon. These results demonstrate a synergistic effect where both the plasma and catalyst are vital for the production of H 2 and carbon nanofibres. In the absence of the catalyst stable plasma could not be ignited with a pure CH 4 flow and thermal studies showed that in the absence of the plasma CH 4 conversion was minimal.

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Section: Plasma Catalyst Reduction In Chsupporting

confidence: 52%

Plasma-assisted methane reduction of a NiO catalyst—Low temperature activation of methane and formation of carbon nanofibres

Gallon

Twigg

et al. 2011

Applied Catalysis B: Environmental

107

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“…At normal pressures, the energy gained by the electrons from the electric field will be more or less balanced by the energy lost due to collisions. Thus, the calculation of the average electron energy with an energy balance equation in the fluid model is considered as a reasonable approach [241]. In particular, microscopic fluid models are able to describe the rapid dynamics and behavior of streamers [242][243][244][245][246][247][248][249].…”

Section: Methods and Techniquesmentioning

confidence: 99%

Dielectric barrier discharges: progress on plasma sources and on the understanding of regimes and single filaments

Brandenburg

2017

Plasma Sources Sci. Technol.

597

424

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Dielectric barrier discharges (DBDs) are plasmas generated in configurations with an insulating (dielectric) material between the electrodes which is responsible for a self-pulsing operation. DBDs are a typical example of nonthermal atmospheric or normal pressure gas discharges. Initially used for the generation of ozone, they have opened up many other fields of application. Therefore DBDs are a relevant tool in current plasma technology as well as an object for fundamental studies. Another motivation for further research is the fact that so-called partial discharges in insulated high voltage systems are special types of DBDs. The breakdown processes, the formation of structures, and the role of surface processes are currently under investigation. This review is intended to give an update to the already existing literature on DBDs considering the research and development within the last two decades. The main principles and different modes of discharge generation are summarized. A collection of known as well as special electrode configurations and reactor designs will be presented. This shall demonstrate the different and broad possibilities, but also the similarities and common aspects of devices for different fields of applications explored within the last years. The main part is devoted to the progress on the investigation of different aspects of breakdown and plasma formation with the focus on single filaments or microdischarges. This includes a summary of the current knowledge on the electrical characterization of filamentary DBDs. In particular, the recent new insights on the elementary volume and surface memory mechanisms in these discharges will be discussed. An outlook for the forthcoming challenges on research and development will be given.

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“…Schematic picture of the dielectric barrier discharge setup was shown in Ref. 10. Similar setups have already been used by several experimental groups.…”

Section: Results and Analysismentioning

confidence: 99%

Modeling of plasma chemistry in an atmospheric pressure Ar/NH3 cylindrical dielectric barrier discharge described using the one-dimensional fluid model

Zhao

2013

Physics of Plasmas

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The keynote of our research is to study the gas phase chemistry in an atmospheric pressure Ar/NH 3 cylindrical dielectric barrier discharge, which is very important to produce the iron-nitride magnetic fluid. For this purpose, a home-made one dimensional fluid model with the Scharfetter-Gummel method has been developed. The equations solved are the particle balances, assuming a driftdiffusion approximation for the fluxes, and the electron energy equation. The self-consistent electric field is obtained by the simultaneous solution of Poisson's equation. The simulations were carried out for the different ammonia concentrations (2%, 3.5%, and 7%), at a voltage of 1 kV, and a driving frequency of 20 kHz. It concluded that the major ion products of Ar are Ar þ and Ar þ 2 . Ar þ is the most important positive ions, followed by Ar þ 2 . It is shown that the NH þ density is smaller than that of the other ammonia ions. The density of NH þ 4 is more than that of the other ammonia ions when the ammonia concentration increased. The diffuse mode can be established after the discharge was ignited, and the mode changes to filamentary mode with an increase in ammonia concentration.

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Modeling of the plasma chemistry and plasma–surface interactions in reactive plasmas

Cited by 23 publications

References 25 publications

Plasma-assisted methane reduction of a NiO catalyst—Low temperature activation of methane and formation of carbon nanofibres

Plasma-assisted methane reduction of a NiO catalyst—Low temperature activation of methane and formation of carbon nanofibres

Dielectric barrier discharges: progress on plasma sources and on the understanding of regimes and single filaments

Modeling of plasma chemistry in an atmospheric pressure Ar/NH3 cylindrical dielectric barrier discharge described using the one-dimensional fluid model

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