NOx and N2O emissions over a Urea-SCR system containing both V2O5-WO3/TiO2 and Cu-zeolite catalysts in a diesel engine

Jung, Young-Dae; Shin, Young Jin; Pyo, Young Dug; Cho, Chong Pyo; Jang, Jinyoung; Kim, Gangchul

doi:10.1016/j.cej.2017.06.020

Cited by 78 publications

(39 citation statements)

References 27 publications

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“…The reason is that the NO 2 is formed at the DOC at high exhaust gas temperatures, where the retrofit works efficiently, combined with the effect of the fast SCR reaction at low temperature. The lower NO x reduction efficiency at the urban phase and cold start is in line with the dependency of the SCR efficiency with the temperature (e.g., [26][27][28]). The technical approach of the retrofit having SCR function added downstream of the DPF and avoiding any changes to the original engine and aftertreatment configuration puts some natural constraints to the cold-start performance.…”

Section: No X Reduction Of the Retrofitsupporting

confidence: 66%

“…The N 2 O emissions were higher with the retrofit activated in the motorway part of all cycles. At high speeds the catalyst reaches temperatures that maximize the production of N 2 O from NO 2 or NH 3 , and NH 3 dosing may also be higher [15,26]. The values, even without activated retrofit, are higher than the future limit of 20 mg/km in China (China 6b) from 2020 [31] and the 10 mg/mi in USA [32].…”

Section: Nh 3 N 2 O and Particle Emissionsmentioning

confidence: 99%

“…The NO 2 concentration is reduced efficiently (middle panel) because the SCR has the appropriate temperature and the presence of NO 2 enhances the SCR activity at lower temperatures [38]. However, some N 2 O is produced at high speed accelerations due to the higher production of N 2 O from NO 2 or NH 3 at high temperatures [15,26] and/or due to NH 3 overdosing [39]. This is more evident at the end of the cycle for the Euro 5b vehicle where a significant increase of N 2 O and NH 3 are seen.…”

Section: Comparison With the Euro 5b Retrofitmentioning

confidence: 99%

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Emissions of a Euro 6b Diesel Passenger Car Retrofitted with a Solid Ammonia Reduction System

et al. 2019

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Nitrogen oxides (NOx) emissions from diesel vehicles are a serious environmental concern. Prior to the introduction of on-road tests at type approval, vehicle on-road NOx emissions were found many times higher than the applicable limits. Retrofitting an existing vehicle is a short/mid-term solution. We evaluated a NOx reduction retrofit system installed on a Euro 6b diesel passenger car both in the laboratory and on the road. The retrofit consisted of an under-floor SCR (selective catalytic reduction) for NOx catalyst in combination with a solid ammonia-based dosing system as the NOx reductant. The retrofit reduced NOx emissions from 25% (50 mg/km) to 82% (725 mg/km) both in the laboratory and on the road. The minimum reduction was achieved at cold start cycles and the maximum at hot start cycles. The retrofit had small effect on CO2 (fuel consumption). No ammonia emissions were detected and the N2O increase was negligible at cold start cycles, but up to 18 mg/km at hot start cycles. The results showed that the retrofit technology could be beneficial even for high emitting Euro 6b diesel vehicles.

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Section: No X Reduction Of the Retrofitsupporting

confidence: 66%

Section: Nh 3 N 2 O and Particle Emissionsmentioning

confidence: 99%

Section: Comparison With the Euro 5b Retrofitmentioning

confidence: 99%

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Emissions of a Euro 6b Diesel Passenger Car Retrofitted with a Solid Ammonia Reduction System

et al. 2019

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“…The selective catalytic reduction of NO x emissions was dates back to 1970s but was used commercially in heavy-duty vehicles in 2005 [32,33]. In the selective catalytic reduction process, NO x emissions in the exhaust gas are converted to N 2 and H 2 O via a reducing agent.…”

Section: Selective Catalytic Reduction Of No X Emissionsmentioning

confidence: 99%

NO_x Pollutants from Diesel Vehicles and Trends in the Control Technologies

Reşi̇toğlu¹

2020

Diesel and Gasoline Engines

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Nowadays, climate change that caused from air pollution has become a major problem on the agenda of almost all countries around the world. Compared to other air pollutants, NO x emissions have an important share in climate change, and especially diesel vehicles are one of the most important sources for the formation of NO x pollutants. This chapter focused on NO x emissions from diesel vehicles and the trends in NO x control technologies; Exhaust Gas Recirculation (EGR), Lean NO x trap (LNT) and Selective Catalytic Reduction of NO x by ammonia (NH 3-SCR) and hydrocarbons (HC-SCR). The reasons of the NO x emissions, environmental effects and damages on human health, NO x emissions from diesel engines and diesel engine parameters affecting NO x emissions are handled in detail. The EGR, LNT and SCR technologies that had large reduction rates of NO x emissions and the latest developments in these systems are comprehensively explained.

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“…(i) High-temperature De-NO x unit at high dust content. In this unit, the temperature of the flue gas entering the NH 3 -SCR reactor is as high as 300-400 • C. This high temperature significantly favors the De-NO x performance of most of the catalysts (e.g., vanadium-type-based catalysts) [150,151]. At present, this technology is the most widely used in SIIs.…”

Section: Nh 3 -Scrmentioning

confidence: 99%

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Liu

et al. 2019

Catalysts

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Nitrogen oxides (NO x ) represent one of the main sources of haze and pollution of the atmosphere as well as the causes of photochemical smog and acid rain. Furthermore, it poses a serious threat to human health. With the increasing emission of NO x , it is urgent to control NO x . According to the different mechanisms of NO x removal methods, this paper elaborated on the adsorption method represented by activated carbon adsorption, analyzed the oxidation method represented by Fenton oxidation, discussed the reduction method represented by selective catalytic reduction, and summarized the plasma method represented by plasma-modified catalyst to remove NO x . At the same time, the current research status and existing problems of different NO x removal technologies were revealed and the future development prospects were forecasted.Catalysts 2019, 9, 771 2 of 39 adsorption, oxidation, reduction, and plasma methods. In view of these attentive findings, adsorption method uses recyclable solid adsorbent material to adsorb NO x from flue gas through microporous structure, remarkably, environmentally friendly, no secondary pollution, and energy-saving and -efficient features make it stand out [18][19][20]. The oxidation process is a method that oxidizes NO into NO 2 or N 2 O 3 with high solubility under the action of an oxidant that is then absorbed by water or alkali solution. The process is simple and cost-saving, and is widely used in the wet flue gas denitrification process with relatively low cost and high removal efficiency of NO x ; except that the oxidized NO and SO 2 can be removed simultaneously to produce high value-added products [21][22][23]. The reduction method has the characteristics of high efficiency, cleanliness, and mildness; NO x removal can be realized at low temperature at present [24][25][26]. The plasma method is used to modify the surface of the catalyst, the dispersion of active species can be improved by plasma treatment, and the stability and low temperature activity of catalyst can be improved [27,28].Seldom, if ever, does a comprehensive article to introduce the current situation and treatment methods of removing NO x . In this paper, we tried to renovate, classify, and summarize the significant perspectives and most relevant findings reported in recent research articles and earlier reviews generalizing the mechanism analysis and research progress of NO x removal by adsorption, oxidation, reduction, and plasma methods, which can provide means for promoting the technological progress of pollution prevention, maintaining healthy development of factories continuously, studying the methods of removing NO x deeply, and mastering different technologies of removing NO x , as well as providing guidance for controlling the emission of NO x from motor vehicles such as diesel, gasoline, and so on. In order to improve the environmental quality and save the ecological environment, this paper further provides a convenient, low-cost, efficient, and economic guidance line.

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NOx and N2O emissions over a Urea-SCR system containing both V2O5-WO3/TiO2 and Cu-zeolite catalysts in a diesel engine

Cited by 78 publications

References 27 publications

Emissions of a Euro 6b Diesel Passenger Car Retrofitted with a Solid Ammonia Reduction System

Emissions of a Euro 6b Diesel Passenger Car Retrofitted with a Solid Ammonia Reduction System

NO_x Pollutants from Diesel Vehicles and Trends in the Control Technologies

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

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NOx and N2O emissions over a Urea-SCR system containing both V2O5-WO3/TiO2 and Cu-zeolite catalysts in a diesel engine

Cited by 78 publications

References 27 publications

Emissions of a Euro 6b Diesel Passenger Car Retrofitted with a Solid Ammonia Reduction System

Emissions of a Euro 6b Diesel Passenger Car Retrofitted with a Solid Ammonia Reduction System

NOx Pollutants from Diesel Vehicles and Trends in the Control Technologies

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

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Product

Resources

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NO_x Pollutants from Diesel Vehicles and Trends in the Control Technologies