Decomposition of inorganic gases in an atmospheric pressure non-equilibrium plasma

Kiyokawa, Kazutoshi; Matsuoka, Hiroki; Itou, Akihiko; Hasegawa, Kazunori; Sugiyama, Kazuo

doi:10.1016/s0257-8972(98)00762-2

Cited by 20 publications

(14 citation statements)

References 5 publications

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“…The removal efficiency is estimated by the analysis of outgoing treated gas by FTIR spectroscopy [130,62], optical emission spectroscopy and TCD gas chromatography [129].…”

Section: Gas Cleaningmentioning

confidence: 99%

Atmospheric pressure plasmas: A review

Tendero¹,

Tixier²,

Tristant³

et al. 2006

Spectrochimica Acta Part B: Atomic Spectroscopy

1,314

740

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“…The removal efficiency is estimated by the analysis of outgoing treated gas by FTIR spectroscopy [130,62], optical emission spectroscopy and TCD gas chromatography [129].…”

Section: Gas Cleaningmentioning

confidence: 99%

Atmospheric pressure plasmas: A review

Tendero¹,

Tixier²,

Tristant³

et al. 2006

Spectrochimica Acta Part B: Atomic Spectroscopy

1,314

740

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“…The NTP technique has been employed successfully for the destruction of various toxic VOCs like chlorinated and fluorinated hydrocarbons [10][11][12], inorganic pollutants such as SO 2 , H 2 S and NO x [13][14][15][16][17] and also aliphatic [18][19][20] and aromatic hydrocarbons [2,3,[20][21][22][23][24]. In the later case the total oxidation to CO 2 and H 2 O is desired, but generally this aim is not achieved.…”

Section: Introductionmentioning

confidence: 99%

Catalytic abatement of volatile organic compounds assisted by non-thermal plasma

Subrahmanyam

Măgureanu

Renken

et al. 2006

Applied Catalysis B: Environmental

182

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A novel catalytic reactor with dielectric barrier discharge (DBD) at atmospheric pressure was developed for the abatement of volatile organic compounds (VOCs). The novelty of DBD reactor is the metallic catalyst serving also as the inner electrode. The catalytic electrode was prepared from sintered metal fibers (SMF) in the form of a cylindrical tube. Oxides of Mn and Co were deposited on SMF by impregnation. Decomposition of toluene taken as the model VOC compound (<1000 ppm in air) was investigated. The catalyst composition, toluene concentration, applied voltage and frequency were systematically varied to evaluate the performance of the DBD reactor. At 100 ppm of toluene, the conversion $100% was achieved in the DBD reactor using a specific input energy (SIE) $ 235 J/l independently of the chemical composition of the SMF catalytic electrode, but the selectivity to CO 2 was observed to be a function of the catalyst composition. The MnO x /SMF catalytic electrode showed the best performance towards total oxidation. At a SIE of 295 J/l, the selectivity to CO 2 was 80% with 100% conversion of toluene. No carbon solid residues were deposited on the electrode. #

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“…Besides the complexity of the plasma processes and their dependence on the actual experimental parameters that control the ignition of plasma and its stabilization, much work is still necessary to describe the plasma reactions that occur for the complex compositions of real exhausts. NO decomposition has been studied for plasmas ignited by different methods such as dielectric barrier processes ,− ,,,− corona or high voltage discharges, ,,− hollow cathode, pulsed microwave reactors, − etc. However, most of these studies have addressed the decomposition reactions of NO in simple mixtures with other gases such as O 2 and/or N 2 or CO 2 . ,− ,,,,− By contrast, real exhaust gases are complex mixtures whose exact composition depends on the type of combustor or motor.…”

Section: Introductionmentioning

confidence: 99%

Plasma Chemistry of NO in Complex Gas Mixtures Excited with a Surfatron Launcher

Cotrino

et al. 2005

J. Phys. Chem. A

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The plasma chemistry of NO has been investigated in gas mixtures with oxygen and/or hydrocarbon and Ar as carrier gas. Surface wave discharges operating at microwave frequencies have been used for this study. The different plasma reactions have been analyzed for a pressure range between 30 and 75 Torr. Differences in product concentration and/or reaction yields smaller than 10% were found as a function of this parameter. The following gas mixtures have been considered for investigation: Ar/NO, Ar/NO/O2, Ar/NO/CH4, Ar/CH4/O2, Ar/NO/CH4/O2. It is found that NO decomposes into N2 and O2, whereas other products such as CO, H2, and H2O are also formed when CH4 and O2 are present in the reaction mixture. Depending on the working conditions, other minority products such as HCN, CO2, and C2 or higher hydrocarbons have been also detected. The reaction of an Ar/NO plasma with deposits of solid carbon has also been studied. The experiments have provided useful information with respect to the possible removal of soot particles by this type of plasma. It has been shown that carbon deposits are progressively burned off by interaction with the plasma, and practically 100% decomposition of NO was found. Plasma intermediate species have been studied by optical emission spectroscopy (OES). Bands and/or peaks due to N2*, NO*, OH*, C2*, CN*, CH*, or H* were detected with different relative intensities depending on the gas mixture. From the analysis of both the reaction products and efficiency and the type of intermediate species detected by OES, different plasma reactions and processes are proposed to describe the plasma chemistry of NO in each particular mixture of gases. The results obtained provide interesting insights about the plasma removal of NO in real gas exhausts.

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Decomposition of inorganic gases in an atmospheric pressure non-equilibrium plasma

Cited by 20 publications

References 5 publications

Atmospheric pressure plasmas: A review

Atmospheric pressure plasmas: A review

Catalytic abatement of volatile organic compounds assisted by non-thermal plasma

Plasma Chemistry of NO in Complex Gas Mixtures Excited with a Surfatron Launcher

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