scholarly journals Removal Dynamics of Nitric Oxide (NO) Pollutant Gas by Pulse-Discharged Plasma Technique

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Lianshui Zhang ◽  
Xiaojun Wang ◽  
Weidong Lai ◽  
Xueliang Cheng ◽  
Kuifang Zhao
Keyword(s):  
Air Pollutants ◽  
Reaction Kinetic ◽  
Emission Spectra ◽  
Nonthermal Plasma ◽  
Plasma Electron ◽  
Discharge Voltage ◽  
Electron Collision ◽  
No Removal ◽  
Plasma Technique ◽  
Major Reaction

Nonthermal plasma technique has drawn extensive attentions for removal of air pollutants such as NOxand SO2. The NO removal mechanism in pulse discharged plasma is discussed in this paper. Emission spectra diagnosis indicates that the higher the discharge voltage is, the more the NO are removed and transformed into O, N, N2, NO2, and so forth. Plasma electron temperatureTeis ranged from 6400 K at 2.4 kV discharge voltage to 9500 K at 4.8 kV. After establishing a zero-dimensional chemical reaction kinetic model, the major reaction paths are clarified as the electron collision dissociation of NO into N and O during discharge and followed by single substitution of N on NO to form N2during and after discharge, compared with the small fraction of NO2formed by oxidizing NO. The reaction directions can be adjusted by N2additive, and the optimal N2/NO mixing ratio is 2 : 1. Such a ratio not only compensates the disadvantage of electron competitive consumption by the mixed N2, but also heightens the total NO removal extent through accelerating the NO oxidization process.

Nonthermal plasma technique for the removal of hydrogen sulfide from methane

2020 ◽  
Author(s):  
A. N. Ochered'ko ◽  
A. Yu. Ryabov ◽  
S. V. Kudryashov
Keyword(s):  
Hydrogen Sulfide ◽  
Nonthermal Plasma ◽  
Plasma Technique

scholarly journals Opacity Corrections for Resonance Silver Lines in Nano-Material Laser-Induced Plasma

Atoms ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 73
Author(s):  
Ashraf M. EL Sherbini ◽  
Ahmed H. EL Farash ◽  
Tharwat M. EL Sherbini ◽  
Christian G. Parigger
Keyword(s):  
Emission Spectra ◽  
Target Surface ◽  
Plasma Electron ◽  
Silver Particles ◽  
Experimental Conditions ◽  
Balmer Series ◽  
Line Shapes ◽  
Bulk Silver ◽  
Nano Material ◽  
Silver Target

Q-switched laser radiation at wavelengths of 355, 532, and 1064 nm from a Nd: YAG laser was used to generate plasma in laboratory air at the target surface made of nano-silver particles of size 95 ± 10 nm. The emitted resonance spectra from the neutral silver at wavelengths of 327.9 nm and 338.2 nm indicate existence of self-reversal in addition to plasma self-absorption. Both lines were identified in emission spectra at different laser irradiation wavelengths with characteristic dips at the un-shifted central wavelengths. These dips are usually associated with self-reversal. Under similar conditions, plasmas at the corresponding bulk silver target were generated. The recorded emission spectra were compared to those obtained from the nano-material target. The comparisons confirm existence of self-reversal of resonance lines that emerge from plasmas produced at nano-material targets. This work suggests a method for recovery of the spectral line shapes and discusses practical examples. In addition, subsidiary calibration efforts that utilize the Balmer series Hα-line reveal that other Ag I lines at 827.35 nm and 768.7 nm are optically thin under variety of experimental conditions and are well-suited as reference lines for measurement of the laser plasma electron density.

Nitrogen oxide removal dynamic process through 15 Ns DBD technique

2015 ◽  
Vol 29 (12) ◽  
pp. 1550053
Author(s):  
Xiaojun Wang ◽  
Lianshui Zhang ◽  
Weidong Lai ◽  
Fengliang Liu
Keyword(s):  
Electron Impact ◽  
Impact Ionization ◽  
Pulse Discharge ◽  
Emission Spectra ◽  
Dissociative Recombination ◽  
Dissociative Excitation ◽  
Dbd Plasma ◽  
Time Resolved ◽  
No Removal ◽  
Oxide Removal

Nitrogen oxides exhaust gas assumes the important responsibility on air pollution by forming acid rain. This paper discusses the NO removal mechanism in 15 ns pulse dielectric barrier discharge (DBD) plasma through experimental and simulating method. Emission spectra collected from plasma are evaluated as sourced from N + and O (3 P ). The corresponding zero-dimensional model is established and verified through comparing the simulated concentration evolution and the experimental time-resolved spectra of N +. The electron impact ionization plays major role on NO removal and the produced NO + are further decomposed into N + and O (3 P ) through electron impact dissociative excitation rather than the usual reported dissociative recombination process. Simulation also indicates that the removal process can be accelerated by NO inputted at lower initial concentration or electrons streamed at higher concentration, due to the heightened electron impact probability on NO molecules. The repetitive pulse discharge is a benefit for improving the NO removal efficiency by effectively utilizing the radicals generated from the previous pulse under the condition that the pulse period should be shorter enough to ignore the spatial diffusion of radicals. Finally, slight attenuation on NO removal has been experimentally and simulatively observed after N 2 mixed, due to the competitive consumption of electrons.

scholarly journals PLASMA-CATALYTIC SYSTEM WITH NARROW-APERTURE ROTATING GLIDING DISCHARGE

2021 ◽  
pp. 136-140
Author(s):  
O.A. Nedybaliuk ◽  
P.V. Tyshchuk ◽  
T.A. Tereshchenko ◽  
I.I. Fedirchyk
Keyword(s):  
Plasma Torch ◽  
Discharge Channel ◽  
Discharge Chamber ◽  
Emission Spectra ◽  
Optical Emission ◽  
Reaction Chamber ◽  
Discharge Voltage ◽  
Gliding Discharge ◽  
The Difference ◽  
Optical Emission Spectra

The article presents the results of the investigation of the rotating gliding discharge with the narrow aperture in the airflow. The photographs of the rotating gliding discharge with the narrow aperture were matched with its voltage oscillograms. Photographs were used to determine the maximum length of the discharge channel and its dependence on the airflow Gd into the discharge chamber. Voltage oscillograms were used to determine the difference between the maximum and minimum discharge voltage ΔU = Umax-Umin. The dependence of the electric field in the positive column on the airflow Gd into the discharge chamber was plotted. Optical emission spectra of the plasma of the rotating gliding discharge with a narrow aperture were captured and used to determine the distribution of the vibrational Tv and rotational Tr temperatures along the length of the plasma torch inside the reaction chamber.

scholarly journals NO removal by nonthermal plasma with modified sepiolite catalyst

2013 ◽  
Vol 418 ◽  
pp. 012117
Author(s):  
M G Chen ◽  
D X Yu ◽  
J F Rong ◽  
Y L Wan ◽  
G C Li ◽  
...  
Keyword(s):  
Nonthermal Plasma ◽  
No Removal

scholarly journals Plasma electron-electron collision effects in proton self-retarding and vicinage forces

2006 ◽  
Vol 24 (1) ◽  
pp. 55-60 ◽  
Author(s):  
MANUEL D. BARRIGA-CARRASCO ◽  
GILLES MAYNARD
Keyword(s):  
Energy Deposition ◽  
Plasma Electron ◽  
Electron Collision ◽  
Electron Collisions ◽  
Ion Energy ◽  
Maximum Value ◽  
Theoretical Results

This paper presents theoretical results for the influence of plasma electron-electron collisions in correlated proton stopping forces. First calculations of the effects of these collisions on the vicinage forces for plasma matter are shown. In particular, these effects are studied in a Te = 10 eV and n = 1023 cm−3 plasma yielding a self-retarding proton force increased more than 11% at maximum value. Also vicinage forces enhances more than 15% in the analyzed cases. All this implies that plasma electron-electron collisions play an important role both in non and correlated ion stopping and must be considered for any application of ion energy deposition in plasma matter.

On the Mechanism of Copper Oxide Reduction by Dielectric Barrier Discharge Plasma Using H2 and Ar Mixture Gases

2013 ◽  
Vol 690-693 ◽  
pp. 1664-1667 ◽  
Author(s):  
Zhi Jian Xu ◽  
Bin Qi ◽  
Lan Bo Di
Keyword(s):  
Copper Oxide ◽  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Reduction Rate ◽  
Emission Spectra ◽  
Optical Emission ◽  
Discharge Voltage ◽  
Oxide Reduction ◽  
Dbd Plasma ◽  
Dielectric Barrier

Dielectric barrier discharge (DBD) plasma was used to reduce copper oxide at atmospheric pressure using Ar and H2 mixture gases. Effect of H2 content on copper oxide reduction was investigated with a constant total flow rate of 100 mlmin-1 when the discharge voltage was kept at 36 kV. The composition of the copper oxide samples before and after DBD plasma treatment was characterized by X-ray diffraction (XRD). The results showed that energetic electrons and metastable Ar were inefficient for reduction of copper oxide in this study and the highest copper oxide reduction rate was obtained when the H2 content was 20%. In addition, no Cu2O was observed. Optical emission spectra (OES) were observed during reduction of copper oxide at different H2 contents, and the mechanism for copper oxide reduction using DBD discharge was discussed.

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