Effect Of Propene, <Emphasis Type="Italic">n</Emphasis>-Decane,and Toluene Plasma Kinetics on NO Conversion in Homogeneous Oxygen-Rich Dry Mixtures at Ambient Temperature |
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Authors: | G Lombardi N Blin-Simiand F Jorand L Magne S Pasquiers C Postel J -R Vacher |
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Institution: | (1) Laboratoire de Physique des Gaz et des Plasmas, CNRS (UMR8578), Université Paris-Sud, Bat. 210, Orsay cedex, 91405, France;(2) Present address: CNRS LIMHP, Université Paris, 13, 99 av. J.-B. Clément, Villetaneuse, 93430, France |
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Abstract: | A photo-triggered discharge is used to study the influence of three hydrocarbons (HCs), propene (C3H6), n-decane (C10H22), and toluene (C6H5CH3) on NO conversion in N2/O2/NO/HC mixtures, with 18.5% O2 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 N2/O2/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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Keywords: | Nitrogen oxide Propene n-decane Toluene Photo-triggered discharge Atmospheric pressure non-thermal plasmas Plasma kinetic Exhaust gas treatment Plasma modeling |
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