Novel base metal-palladium catalytic diesel filter coating with NO2 reducing properties

Johansen, Keld; Dahl, Søren; Mogensen, Gurli; Pehrson, Søren; Schramm, Jesper; Ivarsson, Anders

doi:10.4271/2007-01-1921

Cited by 18 publications

(14 citation statements)

References 4 publications

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“…DOC upstream of DPF increases the ratio of NO 2 to NO in the exhaust and lowers the burning temperature of PMs. NO 2 provides a more effective oxidant than oxygen and so provides optimum passive regeneration efficiency (Johansen et al 2007). …”

Section: Diesel Particulate Filter (Dpf)mentioning

confidence: 99%

The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems

Reşi̇toğlu

Altınışık

Keskïn

2014

Clean Techn Environ Policy

786

353

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Diesel engines have high efficiency, durability, and reliability together with their low-operating cost. These important features make them the most preferred engines especially for heavy-duty vehicles. The interest in diesel engines has risen substantially day by day. In addition to the widespread use of these engines with many advantages, they play an important role in environmental pollution problems worldwide. Diesel engines are considered as one of the largest contributors to environmental pollution caused by exhaust emissions, and they are responsible for several health problems as well. Many policies have been imposed worldwide in recent years to reduce negative effects of diesel engine emissions on human health and environment. Many researches have been carried out on both diesel exhaust pollutant emissions and aftertreatment emission control technologies. In this paper, the emissions from diesel engines and their control systems are reviewed. The four main pollutant emissions from diesel engines (carbon monoxide-CO, hydrocarbons-HC, particulate matter-PM and nitrogen oxides-NO x ) and control systems for these emissions (diesel oxidation catalyst, diesel particulate filter and selective catalytic reduction) are discussed. Each type of emissions and control systems is comprehensively examined. At the same time, the legal restrictions on exhaust-gas emissions around the world and the effects of exhaust-gas emissions on human health and environment are explained in this study.

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Section: Diesel Particulate Filter (Dpf)mentioning

confidence: 99%

The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems

Reşi̇toğlu

Altınışık

Keskïn

2014

Clean Techn Environ Policy

786

353

View full text Add to dashboard Cite

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“…However, with increased availability in low sulphur fuels, palladium has been incorporated for commercial catalysed DPFs as well as DOCs to obtain comparable performance to platinumbased coatings at a lower cost [5].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the low temperature oxidation performance over a Pt and a Pt–Pd diesel oxidation catalyst

Herreros

Gill

Lefort

et al. 2014

Applied Catalysis B: Environmental

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The influence of hydrogen over platinum and combined platinum-palladium diesel oxidation catalysts were investigated on the oxidation kinetics of CO, HC and NO. Although H 2 has been reported to have a positive effect on CO and HC oxidation as well as NO 2 formation over platinum catalysts, there is still uncertainty whether this is due to the temperature rise caused by H 2 oxidation or the result of a change in the reaction kinetics of CO, HC and NO oxidation by the production of intermediate species. The results have showed smaller H 2 concentrations are more effective in improving the catalyst light-off temperature as well as promoting NO oxidation over both platinum and platinum-palladium catalysts. It is suggested that these benefits are a result of not only the exothermic reactions which in turn increase the local catalyst temperature but also H 2 increasing the rate of reactions and the species accessibility to the catalyst active sites thus further CO, HC and NO oxidation can occur at lower catalyst temperatures.

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“…One potential adverse effect of using certain types of DOCs is an increase in secondary NO 2 emissions [Watts et al 1998;NIOSH 2006a,b], which might result from enhanced oxidation of NO to NO 2 in the presence of Pt-based catalyst formulations. This phenomenon is temperature-and catalyst-formulation dependent [McClure et al 1988;Ambs and McClure 1993;Mayer et al 2003;Katare et al 2007;Czerwinski et al 2007;Lorentzou et al 2008;Johansen et al 2007;Khair et al 2008]. In underground mining applications, the catalyst formulations that should be selected are those that minimize secondary NO 2 emissions while preserving an acceptable conversion efficiency for CO and HC over an anticipated duty cycle.…”

Section: Effects Of a Doc On Emissionsmentioning

confidence: 99%

“…An aged, low-activity DOC has even shown to be a net consumer of NO 2 over a wide range of temperatures and space velocities [Katare et al 2007]. DOCs with Pd [Majewski et al 1995] and base-metal-Pd catalysts [Johansen et al 2007] have been found to not produce secondary NO 2 emissions within typical exhaust temperature ranges. However, similar catalysts have shown to have significantly higher light-off temperatures for CO and HC than Pt catalysts [Majewski et al 1995].…”

Section: Effects Of a Doc On Emissionsmentioning

confidence: 99%

Diesel aerosols and gases in underground mines: guide to exposure assessment and control.

Bugarski¹,

Cauda²,

Janisko³

et al. 2011

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Novel base metal-palladium catalytic diesel filter coating with NO2 reducing properties

Cited by 18 publications

References 4 publications

The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems

The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems

Enhancing the low temperature oxidation performance over a Pt and a Pt–Pd diesel oxidation catalyst

Diesel aerosols and gases in underground mines: guide to exposure assessment and control.

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