Influence of water on NO removal by pulsed discharge in N<sub>2</sub>/H<sub>2</sub>O/NO mixtures

Fresnet, F.; Baravian, G.; Magne, L.; Pasquiers, S.; Postel, C.; Puech, Vincent; Rousseau, Antoine

doi:10.1088/0963-0252/11/2/305

Cited by 63 publications

(61 citation statements)

References 44 publications

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“…For this molecule, the excited species correspond to effective states clustering real molecular levels. Details about molecular excited states and cross sections taken into account are given in [35,36], and references therein. Data on propane are from [15].…”

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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“…In the frame of the local field approximation, and under the assumption of a spatially homogeneous discharge, we developed a self-consistent discharge model [45,46,49,53] which couples: (i) the solution of the Boltzmann equation for the electron energy distribution function, (ii) the kinetic equations describing the temporal evolution of the various excited or ionized states, radicals and molecules, produced by the discharge and during the afterglow, and (iii) the electric circuit equations. As many reaction rates are sensitive functions of the gas mixture temperature, the time evolution of the temperature is also taken into account through the resolution of the energy conservation equation.…”

Section: Plasma Modelingmentioning

confidence: 99%

“…For the removal of either NO, hydrocarbons, or Volatile Organic Compounds (VOC), such an approach has been already applied both to studies on the gas mixture composition in the far afterglow [45][46][47], i.e., at a time at which the chemical activity of the electrically energized mixture comes to an end, and on time-resolved studies on molecules (NO, ozone) or radicals (OH) in the afterglow [45,[48][49][50][51][52]. A detailed description of photo-triggered discharges and their applications can be found in the paper of Lacour et al [53] and references therein.…”

Section: Introductionmentioning

confidence: 99%

“…A detailed description of photo-triggered discharges and their applications can be found in the paper of Lacour et al [53] and references therein. Initially designed for the development of highpower lasers, the photo-triggering technique has been applied more recently to gas mixtures (N 2 /O 2 /H 2 O) relevant to the removal of atmospheric pollutants, such as NO [45,48,49], light olefins [46,[50][51][52], or VOC molecules such as ketones, aldehydes, and alcohols [47,51,52,54,55]. In the present work, the effect on NO removal of three types of hydrocarbon molecule has been investigated and compared: (i) a light unsaturated one, propene (C 3 H 6 ), (ii) an heavy aliphatic, n-decane (C 10 H 22 ) and (iii) an aromatic, toluene (C 6 H 5 CH 3 ).…”

Section: Introductionmentioning

confidence: 99%

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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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“…These effects may also have an immediate impact on the targeted applications like electron beam processes that were significantly studied for treatment of gaseous effluents impure by nitrogen oxides, sulphur [2−4] and/ or ozone production [5−8], medical applications [9−13] and surface treatment [14−15]. Thus, new more efficient depolluting processes are at present studied and the use of non-thermal plasmas created by electron beam or electrical discharge methods [16][17][18][19][20][21][22] appears very attractive. The energetic electrons created by the discharge strike the background gas molecules, thereby making long atomic and molecular free radicals that move with the pollutants and convert them, throughout the post-discharge, into clean or easier to gather product through a fancy set of physical and chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Influence of Reduced Electric Fields on NOx Removal in N2/O2/H2O/CO2 Mixture

Ammar¹,

Lemerini²

2017

JESTR

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The aim of this work is to investigate the time evolution of various species concerned in N 2 /O 2 /H 2 O/CO 2 mixed gas induced by negative corona discharge at atmospheric pressure. This study takes under consideration thirty totally different chemical species taking part in two hundred selected chemical reactions. The density is analyzed by the continuity equation without the diffusion term. In literature it has generally been emphasized that certain radicals N, O, and O 3 influence the NO or NO 2 removal. In this work we complete these studies by analyzing others species such as negative ions O ! ! , O ! ! , O ! ! and radicals OH, HO 2 presents in N 2 /O 2 /H 2 O/CO 2 mixture which they participate in NO x removal. In particular, we tend to analyze the time evolution (10 −9 -10 −3 s) of depopulation rate and rate coefficient of bound reactions, beneath completely different reduced electrical fields within the vary of 100-200 Td (1Td=10 −21 V.m 2 ). The results show that the environmental condition rate of NO, NO 2 and NO 3 is well affected by the increase of reduced electric field and concentration.

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Influence of water on NO removal by pulsed discharge in N₂/H₂O/NO mixtures

Cited by 63 publications

References 44 publications

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

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

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

Numerical Simulation of Influence of Reduced Electric Fields on NOx Removal in N2/O2/H2O/CO2 Mixture

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Influence of water on NO removal by pulsed discharge in N2/H2O/NO mixtures

Cited by 63 publications

References 44 publications

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

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

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

Numerical Simulation of Influence of Reduced Electric Fields on NOx Removal in N2/O2/H2O/CO2 Mixture

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Influence of water on NO removal by pulsed discharge in N₂/H₂O/NO mixtures