Fundamental study of NOx removal from diesel exhaust gas by dielectric barrier discharge reactor

Vinh, Trần Quang; Watanabe, Shuya; Furuhata, Tomohiko; Arai, Masataka

doi:10.1007/s12206-012-0402-y

Cited by 26 publications

(14 citation statements)

References 16 publications

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“…The initial concentration of N 2 O was about 13 ppm when there is no plasma inside the exhaust, and this concentration increased to about 18 ppm when applied voltage was 13.5 kV. This increase can be due to the reaction of NO 2 with produced N radicals during the plasma process by the following reaction scheme (Vinh et al 2012):…”

Section: Effect Of Non-thermal Plasma On No X Concentrationmentioning

confidence: 98%

“…Furthermore, emission reduction in diesel engines at low temperature is important in some special applications of diesel engines such as mining industries where exhaust cooling occurs for safety reasons. In comparison with the numerous publications on NO x treatment by plasma (Lebouvier et al 2011;Vinh et al 2012;Arai et al 2004;Jolibois et al 2012;Mohapatro and Rajanikanth 2011;Chae 2003;Yoshida et al 2009), a limited amount of research has investigated particulate matter (Ye et al 2005;Thomas et al 2000;Babaie et al 2013) and most of it has emphasised PM mass reduction only (Yao et al 2006;Fushimi et al 2008). In this paper, the effect of plasma technique on particulate matter constitutes (soot, SOF and sulphates) and NO, NO 2 and N 2 O emission concentrations have been studied.…”

Section: Introductionmentioning

confidence: 94%

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Influence of non-thermal plasma after-treatment technology on diesel engine particulate matter composition and NOx concentration

Babaie

Kishi

Arai

et al. 2015

Int. J. Environ. Sci. Technol.

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The effect of non-thermal plasma technology for particulate matter removal and nitrogen oxide emission reduction from diesel exhaust has been investigated. A sample of exhaust was cooled to the ambient temperature and passed through a dielectric barrier discharge reactor. This reactor was employed for producing plasma inside the diesel exhaust. A range of discharge powers by varying the applied voltage from 7.5 to 13.5 kV (peak-peak) at a frequency of 50 Hz has been evaluated during the experiments. Regarding the NO x emission concentration, the maximum removal efficiency has been achieved at energy density of 27 J/L. Soot, soluble organic fraction and sulphate components of diesel particulate matter have been analysed separately, and the consequence of plasma exposure on particle size distribution on both the nucleation and accumulation modes has been studied. Plasma was found to be very effective for soot removal, and it could approach complete removal efficiency for accumulation mode particles. However, when applied voltage approached 12 kV, the total number of nucleation mode particles increased by a factor of 50 times higher than the total particle numbers at the reactor inlet. This increase in nucleation mode particles increased even more when applied voltage was set at 13.5 kV.

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Section: Effect Of Non-thermal Plasma On No X Concentrationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 94%

Influence of non-thermal plasma after-treatment technology on diesel engine particulate matter composition and NOx concentration

Babaie

Kishi

Arai

et al. 2015

Int. J. Environ. Sci. Technol.

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show abstract

“…8,17 Electrical energy is transferred to electrons in the NTP system, which leads to the formation of free radical species 17 such as N, O, HO 2 , and OH. Subsequently, O 3 , NO 2 , NO 3 , HNO 3 , and several intermediate species 5,9,18,19 are formed, as shown in reactions R1−R20 in the Appendix.…”

Section: ■ Introductionmentioning

confidence: 99%

“…HVD has been investigated and proved to improve diesel exhaust emissions for gaseous (e.g., NOx, − CO, and THCs) and PM emissions. − Fundamentally, HVD operates using a high potential applied to electrodes between which exhaust gas can flow. Exhaust gas molecules are ionized when present near electrodes and release visible light emission, which is referred to as plasma or known as the fourth state of matter .…”

Section: Introductionmentioning

confidence: 99%

Impact of High-Voltage Discharge After-Treatment Technology on Diesel Engine Particulate Matter Composition and Gaseous Emissions

et al. 2021

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Diesel particulate matter (DPM) and oxides of nitrogen (NOx) are the emissions from diesel engines (compression ignition engines) of the most concern and are currently strictly regulated. In this work, we present an alternative diesel emission control technique to assist in further emission reduction. An experiment-oriented study on diesel engine emission abatement using low-power, low-frequency, high-voltage discharge (HVD) treatment was carried out in a laboratory-scale reactor with whole diesel engine exhaust gas. A dielectric barrier discharge (DBD) reactor was used in direct contact with diesel exhaust gas at atmospheric temperature with an input energy density between 200 and 400 J/L. An investigation of the direct effect of the high-voltage discharge reactor on the diesel exhaust gas treatment was carried out to characterize both diesel particle and gaseous emissions. The proposed HVD system demonstrated up to 95% particulate matter reduction by mass or 64% reduction by number, and 63% reduction of the diesel soot particle geometrical mean diameter by HVD-generated O3 oxidation. Thermogravimetric analysis revealed the significant change in the diesel soot compositions and oxidation characteristics. HVD-treated particulate matter demonstrated a lower reactivity in comparison to untreated soot. Gas composition analysis indicated the generation of free radicals (e, O, OH, O3, and N) by the HVD system, as mainly indicated by the increase of the NO2/NO ratio and concentration of CO and O2. The pattern of CO2 reduction while CO and O2 increased indicated the dissociation of CO2 by HVD. Free radicals generated by HVD directly affected DeNO, DeNOx, NO2/NO ratio, and CO and CO2 selectivities.

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“…There are several studies in the literature that examined DBD in order to remove NO x from the exhaust gases. Some researchers employed DBD alone [2], [18]- [24], and some used DBD with catalyst or adsorbent in order to increase NO x removal efficiency [2], [25]- [30].…”

Section: Introductionmentioning

confidence: 99%

The Configuration Effects of Electrode on the Performance of Dielectric Barrier Discharge Reactor for NO<sub><italic>x</italic></sub> Removal

Anaghizi

Talebizadeh

Rahimzadeh

et al. 2015

IEEE Trans. Plasma Sci.

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In this paper, a dielectric barrier discharge cylindrical reactor has been analyzed in order to increase the efficiency of nitrogen oxide (NO x ) removal from the simulated gas under the room temperature. The effects of electrode shape as well as electrode diameter and electrode length are investigated in the nonthermal plasma reactor. Two different electrode configurations (rod and screw thread electrodes) are examined. The experimental result shows that for the rod electrode, NO x removal efficiency is enhanced by increasing the electrode diameter. However, the screw thread electrode is more effective in decreasing NO x concentration. Finally, the results showed that the average input power requirement for NO x removal can be reduced almost 14% using a 1-mm screw thread electrode instead of a rod electrode.Index Terms-Dielectric barrier discharge (DBD) reactor, electrode configuration, NO x removal, nonthermal plasma (NTP), rod electrode, screw thread electrode.

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Fundamental study of NOx removal from diesel exhaust gas by dielectric barrier discharge reactor

Cited by 26 publications

References 16 publications

Influence of non-thermal plasma after-treatment technology on diesel engine particulate matter composition and NOx concentration

Influence of non-thermal plasma after-treatment technology on diesel engine particulate matter composition and NOx concentration

Impact of High-Voltage Discharge After-Treatment Technology on Diesel Engine Particulate Matter Composition and Gaseous Emissions

The Configuration Effects of Electrode on the Performance of Dielectric Barrier Discharge Reactor for NO<sub><italic>x</italic></sub> Removal

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