Mechanism of accelerating soot oxidation by NO2 from diesel engine exhaust

Li, Zehong; Zhang, Wei; Chen, Zhaohui; Jiang, Qianyu

doi:10.1016/j.envpol.2020.114708

Cited by 26 publications

(10 citation statements)

References 57 publications

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“…It can be inferred that the NO 2 would react directly with the elemental carbon in soot to form -C(NO 2 ) groups, and those groups would be further decomposed into -CO groups on the soot surfaces to form CO 2 . In addition, NO 2 could be used to generate reactive oxygen species on catalyst surfaces, and these species would also participate in soot oxidation [32]. As a result, the soot particles packed into the DBD reactor could be oxidized by O• radicals, O 3 and NO 2 in the gas phase via the following reactions (Equations ( 1)-( 7)):…”

Section: Effect Of Catalyst Support On Plasma-catalytic Soot Oxidationmentioning

confidence: 99%

Soot Oxidation in a Plasma-Catalytic Reactor: A Case Study of Zeolite-Supported Vanadium Catalysts

Zhu

Luo

et al. 2022

Catalysts

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The plasma-catalytic oxidation of soot was studied over zeolite-supported vanadium catalysts, while four types of zeolites (MCM-41, mordenite, USY and 5A) were used as catalyst supports. The soot oxidation rate followed the order of V/MCM-41 > V/mordenite > V/USY > V/5A, while 100% soot oxidation was achieved at 54th min of reaction over V/MCM-41 and V/mordenite. The CO2 selectivity of the process follows the opposite order of oxidation rate over the V/M catalyst. A wide range of catalyst characterizations including N2 adsorption–desorption, XRD, XPS, H2-TPR and O2-TPD were performed to obtain insights regarding the reaction mechanisms of soot oxidation in plasma-catalytic systems. The redox properties were recognized to be crucial for the soot oxidation process. The effects of discharge power, gas flow rate and reaction temperature on soot oxidation were also investigated. The results showed that higher discharge power, higher gas flow rate and lower reaction temperature were beneficial for soot oxidation rate. However, these factors would impose a negative effect on CO2 selectivity. The proposed “plasma-catalysis” method possessed the unique advantages of quick response, mild operation conditions and system compactness. The method could be potentially applied for the regeneration of diesel particulate filters (DPF) at low temperatures and contribute to the the emission control of diesel engines.

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Section: Effect Of Catalyst Support On Plasma-catalytic Soot Oxidationmentioning

confidence: 99%

Soot Oxidation in a Plasma-Catalytic Reactor: A Case Study of Zeolite-Supported Vanadium Catalysts

Zhu

Luo

et al. 2022

Catalysts

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show abstract

“…HC and CO are eliminated due to catalyst. During the process, NO will be oxidized to NO2, and it plays an essential role in soot regeneration in particulate filters [12,13,14,15].…”

Section: Structure Of Doc and Partial Flow Dpf Mechanismmentioning

confidence: 99%

“…Fig. (13) indicates the opacity of exhaust gas measured from the exhaust gas analyzer. This graph shows much soot particle generated at high load with a lower engine rpm condition due to incomplete combustion.…”

Section: Emission Analysismentioning

confidence: 99%

Reduction of Diesel Engine’s Particulate Matters using Retrofit CeO₂ Diesel Oxidative Catalyst and Partial Flow Diesel Particulate Filter System

Liu

Charoenphonphanich

Karin

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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In this research, CeO2 was chosen for the DOC catalyst. Moreover, a partial-flow DPF was installed after DOC. The exhaust gas experiment was conducted at 20% - 50% engine load varying 1000,1500, and 2000 rpm of engine speed. The research results show that NOx reduced around 25% with CeO2 DOC and DPF systems at higher engine load. On the other hand, particulate matters decrease around 65% after CeO2 DOC and DPF systems. Furthermore, CO and HC amount were substantially reduced after applying after-treatment systems. According to fuel consumption, BSFC, and BTE results, the after-treatment system has no significant impact on engine performance.

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“…In order to form, firstly, nitric oxide (NO) is generated at high temperatures flame. This is followed by the formation of nitrogen dioxide (NO2) in the stack at cooler temperatures as the result of the oxidization process [17]. Nitrogen oxides (NOx), principally NO and NO2 are pollutant gases that contribute to the formation of acid rain and smog [18].…”

Section: Nitrogen Oxides (Nox) and Hydrocarbon (Hcs)mentioning

confidence: 99%

Evaluation of Emissions by Different Analysis Method at Hot Mix Asphalt Plant Combustion Source

Rahman¹,

Hashim²,

Nashruddin³

2022

IJIE

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The combustion process for the asphalt mixing in hot mix asphalt (HMA) plant can produce harmful flue gases emission into the atmosphere. Combustion activities produce heat for industrial usage whenfuel reacts with oxygen in the air under suitable conditions. High concentrations of undesirable emissions can be formed if the combustion is not properly controlled during the reaction. This paper gives an overview on the method and measurement of these emissions in combustion analysis by focusing on the three types of analysis methods which are laboratory testing analysis, on-site emission analysis, and theoretical analysis. Three types of data were prepared in order to achieve the objective of the study, which are literaturestudy, site visit, and laboratory analysis. The result shows that there areslightly different emission results even though they came from the same source. Clearly, the analysis shows thatthe air-fuel ratio during combustion can havea significant effect on the emission result. The excess air supplied can cause dilution to the emission and leads to a low emission value.

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Mechanism of accelerating soot oxidation by NO2 from diesel engine exhaust

Cited by 26 publications

References 57 publications

Soot Oxidation in a Plasma-Catalytic Reactor: A Case Study of Zeolite-Supported Vanadium Catalysts

Soot Oxidation in a Plasma-Catalytic Reactor: A Case Study of Zeolite-Supported Vanadium Catalysts

Reduction of Diesel Engine’s Particulate Matters using Retrofit CeO₂ Diesel Oxidative Catalyst and Partial Flow Diesel Particulate Filter System

Evaluation of Emissions by Different Analysis Method at Hot Mix Asphalt Plant Combustion Source

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Mechanism of accelerating soot oxidation by NO2 from diesel engine exhaust

Cited by 26 publications

References 57 publications

Soot Oxidation in a Plasma-Catalytic Reactor: A Case Study of Zeolite-Supported Vanadium Catalysts

Soot Oxidation in a Plasma-Catalytic Reactor: A Case Study of Zeolite-Supported Vanadium Catalysts

Reduction of Diesel Engine’s Particulate Matters using Retrofit CeO2 Diesel Oxidative Catalyst and Partial Flow Diesel Particulate Filter System

Evaluation of Emissions by Different Analysis Method at Hot Mix Asphalt Plant Combustion Source

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Product

Resources

About

Reduction of Diesel Engine’s Particulate Matters using Retrofit CeO₂ Diesel Oxidative Catalyst and Partial Flow Diesel Particulate Filter System