Characterization of pulsed discharge plasma at atmospheric pressure

Mishra, Lekha Nath; Shibata, Kanetoshi; Ito, Hiroaki; Yugami, Noboru; Nishida, Yasushi

doi:10.1016/j.surfcoat.2006.08.126

Cited by 14 publications

(9 citation statements)

References 14 publications

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“…The major metastable helium species are 2 3 s: 19.8 eV and 2 1 s: 20.6 eV [13,14]. These energy values are much higher than the CH 4 and CO 2 ionisation potential, consequently, the ionisation of the reactants proceeds according to [15,16]:…”

Section: Conversion and Reactivitymentioning

confidence: 99%

Carbon Dioxide Reforming of Methane Using a Dielectric Barrier Discharge Reactor: Effect of Helium Dilution and Kinetic Model

Goujard

Tatibouët

Batiot‐Dupeyrat

2011

Plasma Chem Plasma Process

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The carbon dioxide reforming of methane to synthesis gas was investigated in a dielectric barrier discharge reactor at room temperature. The influence of dilution of reactants by helium was studied. We showed that, at a fixed contact time, the conversions of CH 4 and CO 2 increase when the amount of helium in the gas mixture increases. This result is attributed to the ''penning ionization'' phenomenon, which corresponds to an energy transfer from excited He to molecules in ground state (CH 4 , CO 2 ). The selectivity to products is affected by the dilution factor. As soon as helium is present in a large amount the formation of products resulting from recombination of methyl radicals (such as C 2 , C 3 and C 4 ) is less favourable due to the lowest probability of collisions to proceed. A kinetic model is proposed based on the assumption that the reactant molecules CH 4 or CO 2 are attacked by active species produced by the plasma discharges, and the production of this active species are function of the plasma power. This model which takes into account the dilution by helium fits particularly well the experimental data we obtained.

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Section: Conversion and Reactivitymentioning

confidence: 99%

Carbon Dioxide Reforming of Methane Using a Dielectric Barrier Discharge Reactor: Effect of Helium Dilution and Kinetic Model

Goujard

Tatibouët

Batiot‐Dupeyrat

2011

Plasma Chem Plasma Process

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“…Interestingly, numerous investigations have focused on upgrading the conversion process of methane (CH 4 ), which is a main constituent in natural gas in all reserves around the world, to produce higher value-added chemicals by reforming reactions. Non-thermal plasma has reportedly been used for several chemical conversion processes, also involving either non-oxidative methane reforming [1][2][3][4][5][6][7], oxidative methane reforming [8][9][10][11][12][13][14][15], or hybrid plasma-catalytic methane reforming [16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Due to its non-equilibrium property, nonthermal plasma, with high-energy electrons, creates principally a large number of chemically active species through electronic and ionic collision processes, and then immediately induces subsequent chemical reactions under ambient temperature and atmospheric pressure.…”

Section: Introductionmentioning

confidence: 99%

Plasma-catalytic reforming of methane in AC microsized gliding arc discharge: Effects of input power, reactor thickness, and catalyst existence

Rueangjitt

Sreethawong

Chavadej

et al. 2009

Chemical Engineering Journal

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“…In the plasma environment, energetic electrons generated by gliding arc discharge primarily collide with gaseous CH 4 molecules to cause the CH 4 dissociation reactions, creating various methyl species, as well as carbon and hydrogen radicals for subsequent reactions (6)(7)(8)(9).…”

Section: Proposed Chemical Reaction Pathways For the Non-oxidative Mementioning

confidence: 99%

“…A promising way is to use non-thermal plasma for the methane reforming. Numerous investigations have been focused on the direct methane reforming using the non-thermal plasma; these include non-oxidative methane reforming [1][2][3][4][5][6][7][8], oxidative methane reforming [9][10][11][12][13][14][15][16][17][18], and hybrid plasma-catalytic reforming of methane [19][20][21][22][23][24][25][26][27][28][29][30][31][32]. The energetic electrons generated by non-thermal plasma can effectively induce the creation of a huge number of chemically active species via electronic and ionic collision-dissociation-combination mechanisms, and these generated active species can rapidly undergo several chemical reactions under ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

Non-Oxidative Reforming of Methane in a Mini-Gliding Arc Discharge Reactor: Effects of Feed Methane Concentration, Feed Flow Rate, Electrode Gap Distance, Residence Time, and Catalyst Distance

Rueangjitt

Sreethawong

Chavadej

et al. 2011

Plasma Chem Plasma Process

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In this work, a mini-gliding arc discharge reactor was employed for the reforming of methane under ambient temperature and pressure operation. Acetylene and hydrogen were produced dominantly with high selectivities of *70-90 and *75%, respectively. The results showed that both methane conversion and product selectivities depended strongly on various operating parameters, including feed methane concentration, feed flow rate, electrode gap distance, residence time, and the presence of a reforming catalyst (as a function of catalyst distance). The Ni catalyst-loaded porous alumina-silica plate was used to study the catalytic effect on the process performance at various residence times. A considerable enhancement of methane conversion and product yields was achieved in the combined plasma-catalytic system, particularly at a longer residence time. The catalyst distance, or packing position of catalyst plate, was also found to be an important factor affecting the process performance of the combined plasma-catalytic methane reforming. The closer catalyst distance led to the greater methane conversion because of the greater possibility of adsorption-desorption interactions of excited gaseous species on the catalyst surface to enhance subsequent reactions.

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Characterization of pulsed discharge plasma at atmospheric pressure

Cited by 14 publications

References 14 publications

Carbon Dioxide Reforming of Methane Using a Dielectric Barrier Discharge Reactor: Effect of Helium Dilution and Kinetic Model

Carbon Dioxide Reforming of Methane Using a Dielectric Barrier Discharge Reactor: Effect of Helium Dilution and Kinetic Model

Plasma-catalytic reforming of methane in AC microsized gliding arc discharge: Effects of input power, reactor thickness, and catalyst existence

Non-Oxidative Reforming of Methane in a Mini-Gliding Arc Discharge Reactor: Effects of Feed Methane Concentration, Feed Flow Rate, Electrode Gap Distance, Residence Time, and Catalyst Distance

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