NO removal in a photo-triggered discharge reactor

Rozoy, M.; Postel, C.; Puech, Vincent

doi:10.1088/0963-0252/8/3/301

Cited by 25 publications

(53 citation statements)

References 37 publications

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“…The gas temperature time evolution is taken into account through the resolution of the energy conservation equation. The model has been described in detail previously, together with the kinetic scheme adopted for the nitrogen molecule [21,23,34]. For this molecule, the excited species correspond to effective states clustering real molecular levels.…”

Section: Self-consistent Modellingmentioning

confidence: 99%

Propane dissociation in a non-thermal high-pressure nitrogen plasma

Moreau¹,

Pasquiers²,

Blin-Simiand³

et al. 2010

J. Phys. D: Appl. Phys.

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Abstract. The removal and the conversion processes of propane in N 2 /C 3 H 8 mixtures (concentration of hydrocarbon molecules up to 5500 ppm) energised by a photo-triggered discharge (homogeneous plasma) are studied at 460 mbar total pressure, both experimentally and theoretically. A self-consistent 0D discharge and kinetic model is used to interpret chromatographic measurements of propane and some by-products concentrations (hydrogen and hydrocarbons with 2 or 3 carbon atoms). It is suggested, from the comparison between measurements and model predictions, that quenching processes of nitrogen metastable states by C 3 H 8 lead to the dissociation of the hydrocarbon molecule, and are the most important processes for the removal of propane. Such a result is obtained using the quenching coefficient value previously determined by Callear and Wood for the A 3 Σ + u state [19], whereas the coefficient for collisions of the singlet states with C 3 H 8 is estimated to be 3.0x10 -10 cm 3 s -1 in order to explain the measured propane disappearance in the N 2 / C 3 H 8 mixture excited by the photo-triggered discharge. The hydrogen molecule is the measured most populated by-product and, also from the comparison between experimental results and model predictions, the most probable dissociation products of propane appear to be H 2 and C 3 H 6 . The propene molecule is also efficiently dissociated by quenching processes of N 2 states, and probably leads to the production of hydrogen atoms and methyl radicals with equivalent probabilities. The kinetic model predicts that the carbon atom is distributed amongst numerous molecules, including HCN, CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 6 , C 3 H 6 .

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Section: Self-consistent Modellingmentioning

confidence: 99%

Propane dissociation in a non-thermal high-pressure nitrogen plasma

Moreau¹,

Pasquiers²,

Blin-Simiand³

et al. 2010

J. Phys. D: Appl. Phys.

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“…A 0D model has been previously developed [5][6][7][8]26], which couples : i) the solution of the Boltzmann equation for the electrons, ii) the kinetic equations describing the temporal evolution of the various species (molecular excited states, ions, atoms, radicals, molecules) produced during the discharge or during the afterglow, iii) the electric circuit equations given by the Kirchoff laws. Many reaction rates are sensitive functions of the gas temperature so that temperature time evolution is taken into account through the resolution of the energy conservation equation.…”

Section: Self-consistent Modellingmentioning

confidence: 99%

“…Details on the code configuration and the numerical procedure are given in [26]. The measured time evolutions of the voltage and the discharge current were compared to the computed ones in order to check that energy deposition in the plasma composed of atmospheric gases is well predicted by the model [7,8].…”

Section: Self-consistent Modellingmentioning

confidence: 99%

“…Details about the kinetic scheme adopted for atmospheric gases has been given in [5][6][7][8] As far as a carbonated molecule is added to N 2 /O 2 , numerous other kinetic processes are involved in the discharge. As a first step, we have only considered oxidation and dissociation reactions of acetone and IPA, and the kinetics of by-products containing carbon atoms (ions and radicals) have been neglected.…”

Section: Self-consistent Modellingmentioning

confidence: 99%

“…The photo-triggering technique allows to achieve homogeneous transient high-pressure plasmas in various types of gas mixtures, in particular those with atmospheric gases N 2 , O 2 , and H 2 O [7,8]. Therefore measurements are compared to predictions of a self-consistent 0D discharge and kinetic model which takes into account all relevant reactions for OH and the VOC molecule.…”

Section: Introductionmentioning

confidence: 99%

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OH kinetics in photo-triggered discharges used for VOCs conversion

Magne¹,

Blin-Simiand²,

Gadonna³

et al. 2009

Eur. Phys. J. Appl. Phys.

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The kinetic of the hydroxyl radical is studied in N 2 /O 2 /H 2 O mixtures with small amounts of acetone or isopropyl alcohol (0.5 %). The radical density is measured in absolute value in the afterglow of a photo-triggered discharge, which generates an homogeneous transient nonequilibrium plasma, using a time resolved absorption measurement method. For dry mixtures, experimental results are compared to predictions of a self-consistent 0D discharge and kinetic model. It is shown that dissociation of the VOCs through quenching collisions of nitrogen metastable states plays an important role in the production of OH. Measurements can not be explained looking only at the oxidation of acetone or IPA by the oxygen atom. This result is reinforced by experimental results about the OH density in wet mixtures, with or without VOCs, compared to dry ones. PACS:Plasma

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Effect Of Propene, n-Decane, and Toluene Plasma Kinetics on NO Conversion in Homogeneous Oxygen-Rich Dry Mixtures at Ambient Temperature

Lombardi

Blin-Simiand

Jorand

et al. 2007

Plasma Chem Plasma Process

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A photo-triggered discharge is used to study the influence of three hydrocarbons (HCs), propene (C 3 H 6 ), n-decane (C 10 H 22 ), and toluene (C 6 H 5 CH 3 ) on NO conversion in N 2 /O 2 /NO/HC mixtures, with 18.5% O 2 concentration, 700 ppm of NO, and an hydrocarbon concentration ranging between 190 ppm and 2,700 ppm. The electrical system generates a transient homogeneous plasma, working under 400 mbar total pressure, with a 50 ns short current pulse at a repetition frequency up to a few Hz. The NO concentration at the exit of the reactor is quantified using absolute FTIR spectroscopy measurements, as a function of the specific deposited energy in the discharge and the mixture composition. Owing to the plasma homogeneity, the experimental results can be compared to predictions of a self-consistent 0-D discharge and kinetic model based on available data in the literature about reactions and their rate constants. It is shown that the addition of either propene (as for DBD or corona discharges) or n-decane to N 2 /O 2 /NO leads to an improvement of the NO removal as compared to the mixture without hydrocarbon molecules. The adopted kinetic schemes explain this effect for the two mixture types. On the other hand, both the experiments and model predictions emphasize that the addition of toluene does not lead to the improvement of NO conversion. Moreover, compounds that are useful for NO x reduction catalysis, such as aldehydes, are less produced in the mixture with toluene.

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NO removal in a photo-triggered discharge reactor

Cited by 25 publications

References 37 publications

Propane dissociation in a non-thermal high-pressure nitrogen plasma

Propane dissociation in a non-thermal high-pressure nitrogen plasma

OH kinetics in photo-triggered discharges used for VOCs conversion

Effect Of Propene, n-Decane, and Toluene Plasma Kinetics on NO Conversion in Homogeneous Oxygen-Rich Dry Mixtures at Ambient Temperature

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