Characterizing Light-Off Behavior and Species-Resolved Conversion Efficiencies During In-Situ Diesel Oxidation Catalyst Degreening

Knafl, Alexander; Busch, Stephen; Han, Manbae; Bohac, Stanislav V.; Assanis, Dennis N.; Szymkowicz, Patrick G.; Blint, Richard D.

doi:10.4271/2006-01-0209

Cited by 28 publications

(15 citation statements)

References 22 publications

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“…In both engine and PEMS, alkanes were highest at 40.3-57.0% because there are 23 individual alkane components, accounting for the highest ratio among NMVOCs. The ratio of PEMS for alkanes was higher in Tier 4 than Tier 3 because alkanes have lower reactivity with DOC than others (Bohac et al, 2006;Knafl et al, 2006). According to Knafl et al (2006), the VOCs had different conversion efficiencies through diesel oxidation catalysts, corresponding to 63-80%, 74-83%, and 92-99%, for alkanes, aromatics, and alkenes, respectively.…”

Section: Emission Characteristics Of Regulated Pollutantsmentioning

confidence: 99%

“…The ratio of PEMS for alkanes was higher in Tier 4 than Tier 3 because alkanes have lower reactivity with DOC than others (Bohac et al, 2006;Knafl et al, 2006). According to Knafl et al (2006), the VOCs had different conversion efficiencies through diesel oxidation catalysts, corresponding to 63-80%, 74-83%, and 92-99%, for alkanes, aromatics, and alkenes, respectively. In addition, similar results from heavy-duty diesel trucks and buses have been reported in the literature (NIER, 2017), with alkane, aromatic, and alkene emissions of 46.1-48.5%, 24.2-25.8%, and 22.3-25.1%, respectively.…”

Section: Emission Characteristics Of Regulated Pollutantsmentioning

confidence: 99%

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Emission Characteristics of Hazardous Air Pollutants from Construction Equipment

Jung

Kim

Lim

et al. 2020

Aerosol Air Qual. Res.

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The emission characteristics of mobile air pollution sources belonging to the non-road sector have yet to be thoroughly investigated, especially when compared to those of on-road vehicles. Hence, the present study employed an engine dynamometer to evaluate the emissions of a diesel engine complying with Tier 3 standards during various driving modes (KC1-8, NRSC, and NRTC) and a portable emissions measurement system (PEMS) to assess those of two excavators, one complying with Tier 3 and the other with Tier 4 standards, during real-world working and driving conditions. The characteristics and chemical composition of the emitted regulated pollutants (carbon monoxide (CO), non-methane hydrocarbon (NMHC), nitrogen oxide (NO x), and particulate matter (PM)) and hazardous air pollutants (HAPs), e.g., volatile organic compounds (VOCs), aldehydes, and polycyclic aromatic hydrocarbons (PAHs), were then determined. For the regulated pollutants, NRTC mode generated the highest emissions owing to the rapid changes in engine load and speed during transitions. As a result of the after-treatment systems, which utilized a diesel oxidation catalyst (DOC) and selective catalytic reduction (SCR), CO, NMHC, and NO x emissions from the Tier 4-compliant excavator were lower than those from the Tier 3compliant diesel engine and excavator. The operating conditions of the diesel engine and construction equipment as well as the after-treatment systems significantly affected the composition of the non-methane volatile organic compound (NMVOC) emissions, which were dominated by alkanes that comprised 23 detected species. Sampling the particle-phase PAHs, we found phenanthrene, fluoranthene, and naphthalene; furthermore, we estimated the concentrations of the gas-phase PAHs with models to obtain the total PAH concentrations. Formaldehyde, which contributed the largest fraction of the aldehydes, was more abundant than the other species. Thus, emissions from non-road sources, including construction equipment, must be controlled because of the considerable health risks from pollutants such as formaldehyde and benzene. Our results will aid in the establishment of a national emission inventory for HAPs.

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Section: Emission Characteristics Of Regulated Pollutantsmentioning

confidence: 99%

Section: Emission Characteristics Of Regulated Pollutantsmentioning

confidence: 99%

Emission Characteristics of Hazardous Air Pollutants from Construction Equipment

Jung

Kim

Lim

et al. 2020

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

show abstract

“…There are many reports of oxidation catalysts in the exhaust system of diesel engines [5][6][7][8]. That caused significant reductions in HC, PM, and CO with oxidation catalysts [5,8]. However, the benefits are somewhat dependent upon engine loads/exhaust temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…That caused significant reductions in HC, PM, and CO with oxidation catalysts [5,8]. The light-off temperature of diesel oxidation catalyst is usually around 200°C [6][7][8]. The light-off temperature of diesel oxidation catalyst is usually around 200°C [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on exhaust gas after treatment using limestone

Sakhrieh¹

2013

THERM SCI

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In this study a simple low-cost exhaust gas after-treatment filter using limestone was developed and tested on a four cylinder DI diesel engine coupled with dynamometer under variable engine running conditions. Limestone was placed in cast iron housing through which exhaust gases passes. The concentration of both carbon dioxide and nitrogen oxides were measured with and without the filter in place. It was found that both pollutants were decreased significantly when the filter is in place, with no increase in the fuel consumption rate

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“…Nowadays the development and the optimization of aftertreatment systems are fundamental keys to meet the ever more severe regulations concerning automotive exhaust emissions [1][2][3][4][5][6]. In the last few decades a host of experimental and numerical investigations have been carried out to increase the efficiency of aftertreatment systems and reduce engine tail pipe emissions [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A numerical analysis of energetic performances of active and passive aftertreatment systems

Algieri¹,

Amelio²,

Morrone³

2009

Int. J. Energy Res.

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SUMMARYThe present work aims to analyze the thermal and the energetic performances of an aftertreatment system with unidirectional and periodic reversal flow within the device. To this purpose a single-channel one-dimensional model was developed in order to assess the heat exchange between the aftertreatment system and the exhaust gas. Furthermore, the temperature profiles of the gas and solid phase were computed and the calculated temperatures were adopted to characterize the energy effectiveness of the aftertreatment system. The comparison between different control modes showed an increase in the heat retention efficiency of the system with reverse flow at low engine load conditions. Conversely, the system with passive thermal management presented higher temperatures of the monolith during the warm-up operations. Furthermore, the influence of unburned hydrocarbons oxidation on the effectiveness of the aftertreatment system was evaluated and the significant influence of the cycle time and the monolith length on the system performance was shown. Finally, the gas residence time was evaluated for different operating conditions.

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Characterizing Light-Off Behavior and Species-Resolved Conversion Efficiencies During In-Situ Diesel Oxidation Catalyst Degreening

Cited by 28 publications

References 22 publications

Emission Characteristics of Hazardous Air Pollutants from Construction Equipment

Emission Characteristics of Hazardous Air Pollutants from Construction Equipment

Experimental study on exhaust gas after treatment using limestone

A numerical analysis of energetic performances of active and passive aftertreatment systems

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