Development of SCR on Diesel Particulate Filter System for Heavy Duty Applications

Naseri, Mojghan; Chatterjee, Sougato; Castagnola, Mario; Chen, Hai-Ying; Fedeyko, Joseph M.; Hess, Howard; Li, Jianquan

doi:10.4271/2011-01-1312

Cited by 59 publications

(24 citation statements)

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“…In the present work, as well as in the cited literature, it has been shown, that similar NO x reduction rates may be reached with the integrated (SDPF) systems and with the conventional SCR, [23,25,26]. …”

Section: Sdpfmentioning

confidence: 55%

“…Due to the lower volume, there is a reduced thermal capacity and a quicker warm-up. There can also be lower costs of the coatings [25,27].…”

Section: Sdpfmentioning

confidence: 99%

“…There are efforts and research of integrating the functions of filtration and NO x reduction in one element, [22][23][24][25][26]. This is designed as SCR on filter (SCRoF) or SCRF, or SDPF.…”

Section: Sdpfmentioning

confidence: 99%

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Emission Reduction with Diesel Particle Filter with SCR Coating (SDPF)

Czerwiński

Zimmerli

Mayer³

et al. 2015

Emiss. Control Sci. Technol.

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The present paper informs about some results obtained with selective catalytic reduction (SCR) and with SDPF (a diesel particle filter (DPF) with SCR coating) on a medium duty research engine Iveco F1C. This work is a first attempt at evaluating the effects of a SDPF on non-legislated gaseous emissions and on secondary nanoparticles. Beside the limited gaseous emission components, NH 3 , NO 2 , and N 2

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Section: Sdpfmentioning

confidence: 55%

“…Due to the lower volume, there is a reduced thermal capacity and a quicker warm-up. There can also be lower costs of the coatings [25,27].…”

Section: Sdpfmentioning

confidence: 99%

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Emission Reduction with Diesel Particle Filter with SCR Coating (SDPF)

Czerwiński

Zimmerli

Mayer³

et al. 2015

Emiss. Control Sci. Technol.

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“…The premise is that, with the SCR layer on the DPF (SCRF), the exhaust temperature is high enough for better NO x reduction, and mass transfer limitations may be reduced because the flow of gases would be forced through the filter walls . Using the SCRF alone could not achieve the desired NO x reduction, so an additional SCR catalyst was required downstream, but this still enabled a total reduction of SCR catalyst volume . This volume reduction is limited by the filter porosity; a high porosity filter is required to increase SCR catalyst loading without causing excessive back pressure .…”

Section: Diesel Particulate Filter (Dpf) Catalytic Soot Filter (Csf)mentioning

confidence: 99%

Heterogeneous catalyst design: Zoned and layered catalysts in diesel vehicle aftertreatment monolith reactors

Hazlett

Epling

2018

Can J Chem Eng

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There have been ongoing research efforts focused on layering or zoning different washcoats/active metals on the catalysts constituting diesel aftertreatment systems: the diesel oxidation catalyst (DOC), the selective catalytic reduction (SCR) catalyst, the lean NOX trap (LNT), the ammonia slip catalyst (ASC), and the diesel particulate filter (DPF). This review paper aims to shed insight into the state‐of‐the‐art research on catalyst design in this area and how these catalyst designs may evolve to tackle engine emission reductions in the future. First, we discuss the motivation for zoning or layering catalysts and pioneering work on three‐way catalyst (TWC) design for reducing gasoline engine emissions; then, we focus on the catalytic systems used for diesel exhaust aftertreatment. The configuration of the aftertreatment systems for diesel engines generally consist of an oxidation catalyst for hydrocarbon (HC), CO, and NO oxidation (over the DOC), a NOX reduction catalyst (over one or combined SCR/LNT/ASC catalysts), and a particulate matter (PM) filter (using a DPF). The research to date consistently demonstrates that zoning and layering catalyst regions leads to improved performance and/or smaller system volumes required.

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“…Previous work has demonstrated that SCR-DPF systems have high NO x conversion capabilities [2,3,4,5]. For the downstream flow through SCR catalysts, work is continuing to demonstrate that high NO x reduction can be achieved by placing a high amount of active catalytic material on highly porous and high cell density flow through substrates [6,7,8].…”

Section: Introductionmentioning

confidence: 95%

Development of Emission Control Systems to Enable High NO_x Conversion on Heavy Duty Diesel Engines

Naseri

Aydin

Mulla

et al. 2015

SAE Int. J. Engines

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To meet NO x emission requirements and regulations for heavy duty diesel engines, selective catalytic reduction (SCR) has been demonstrated to be an effective solution. With increasing demand for improved fuel economy there is a desire to improve the NO x emission reduction of the SCR system, thus allowing for higher engine out NO x emissions. Such requirements will challenge the current aftertreatment designs, which consist of DOC, catalyzed soot filter (CSF) and SCR units. One approach is to replace the CSF with a diesel particulate filter coated with SCR (SCR-DPF) while keeping the flow-through SCR downstream. The downstream SCR can also be improved by using a highly porous flow-through substrate coated with higher washcoat loadings than those typically used on standard substrates today. This design will not only allow for improvement of NO x conversion at low temperature since the SCR-DPF unit will be closer to turbo out, but also an increased number of SCR active sites can be placed in the overall system without increasing the packing size in a typical 2010/13 system and thus provide high NO x conversion. For the SCR-DPF technology, high porosity filters are needed to enable the use of the higher catalytic loadings necessary to get good performance and durability. These highly porous filters need to have very good thermo mechanical properties to enable them to survive the active regeneration events over the life of the system. Also, a novel catalyst known as diesel Cold Start Concept (dCSC™) ABSTRACT Selective Catalytic Reduction (SCR) systems have been demonstrated as effective solutions for controlling NO x emissions from Heavy Duty diesel engines. Future HD diesel engines are being designed for higher engine out NO x to improve fuel economy, while discussions are in progress for tightening NO x emissions from HD engines post 2020. This will require increasingly higher NO x conversions across the emission control system and will challenge the current aftertreatment designs. Typical 2010/2013 Heavy Duty systems include a diesel oxidation catalyst (DOC) along with a catalyzed diesel particulate filter (CDPF) in addition to the SCR sub-assembly. For future aftertreatment designs, advanced technologies such as cold start concept (dCSC™) catalyst, SCR coated on filter (SCRF ® hereafter referred to as SCR-DPF) and SCR coated on high porous flow through substrates can be utilized to achieve high NO x conversions, in combination with improved control strategies.The objective of this work is to evaluate different advanced emission control system options in order to meet future high NO x conversions.First, high performance NO x control system architecture was designed by using a combination of dCSC catalyst, SCR-DPF filter system and high performance SCR on high porosity substrates. In this architecture, dCSC technology stores NO x during cold start when system is cold for any SCR reaction and then releases when the system warms up to allow NO x reduction across the SCR-DPF filter. The SCR-DPF filter enables lower t...

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Development of SCR on Diesel Particulate Filter System for Heavy Duty Applications

Cited by 59 publications

References 1 publication

Emission Reduction with Diesel Particle Filter with SCR Coating (SDPF)

Emission Reduction with Diesel Particle Filter with SCR Coating (SDPF)

Heterogeneous catalyst design: Zoned and layered catalysts in diesel vehicle aftertreatment monolith reactors

Development of Emission Control Systems to Enable High NO_x Conversion on Heavy Duty Diesel Engines

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Development of SCR on Diesel Particulate Filter System for Heavy Duty Applications

Cited by 59 publications

References 1 publication

Emission Reduction with Diesel Particle Filter with SCR Coating (SDPF)

Emission Reduction with Diesel Particle Filter with SCR Coating (SDPF)

Heterogeneous catalyst design: Zoned and layered catalysts in diesel vehicle aftertreatment monolith reactors

Development of Emission Control Systems to Enable High NOx Conversion on Heavy Duty Diesel Engines

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Product

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Development of Emission Control Systems to Enable High NO_x Conversion on Heavy Duty Diesel Engines