The Development of Advanced 2-Way SCR/DPF Systems to Meet Future Heavy-Duty Diesel Emissions

Tan, Julian; Solbrig, Charles E.; Schmieg, Steven J.

doi:10.4271/2011-01-1140

Cited by 49 publications

(41 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, V-catalysts are capable to oxidize organic compounds [6][7][8][9][10]. Usually, a combination of a diesel-oxidation catalyst (DOC), diesel particulate filter (DPF) and SCR-catalyst is proposed nowadays, but the use of vanadia-based and other SCR catalysts with hydrocarbon/soot oxidation capabilities may allow the use of an SCR-only system or at least a 2-Way SCR/DPF system [11]. In addition, the development of the so called "Four-Way Catalyst" has been discussed for simultaneous removal of CO, HCs, PM and NO x emissions [12].…”

Section: Introductionmentioning

confidence: 99%

Soot and hydrocarbon oxidation over vanadia-based SCR catalysts

et al. 2015

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Soot and hydrocarbon oxidation over vanadia-based SCR catalysts

et al. 2015

View full text Add to dashboard Cite

“…Nomenclature A. Latin Letters a 1 Constant in channel pressure drop correlation − c m Molecular density of gas mol/m 3 C 1 Parameter for wall permeability correction − C 2 Parameter for wall permeability correction − C 4 Slip correction factor − C P Specific heat capacity J/(kg⋅K) …”

Section: -Scr Crt Modelmentioning

confidence: 99%

“…To answer to those needs, catalyst manufacturers have recently focused on the development of combined SCR/DPF devices (often referred to as SCRF®, WSCR, or SDPF) in which the highly porous walls of the DPF are impregnated with SCR catalytic material. Such devices have been shown to have high NO x conversion capabilities [1,2,4]. Cu-and Fe-zeolitebased catalysts are more appropriate and commonly used as SCR catalysts on DPF due to their higher thermal stability [5].…”

Section: Introductionmentioning

confidence: 99%

“…Typically, the reduction of NO x and PM emissions is performed by separate devices [1]. Selective catalytic reduction (SCR) systems have been demonstrated as an effective solution for controlling NO x emissions from heavy-duty diesel engines [2], while diesel particulate filters (DPF) are nowadays a wellestablished technology to reduce PM emissions, with their application ranging from light-to heavy-duty powertrains, but also in non-road.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Interaction of NO x Reduction and Soot Oxidation in a DPF with Cu-Zeolite SCR Coating

Tronconi

Nova

Marchitti

et al. 2015

Emiss. Control Sci. Technol.

View full text Add to dashboard Cite

The combination of selective catalytic reduction (SCR) and diesel particulate filter (DPF) in one system (so called SDPF) enables a very compact design and has already found its way into commercial application for passenger cars. In the case of heavy-duty and non-road applications, the design and control of the SDPF heavily depends on the interaction between NO x reduction and soot oxidation reactions taking place in close vicinity. The governing phenomena are described and studied in the present work by means of multi-scale experimental testing and mathematical modeling. Detailed kinetic studies at a micro-scale laboratory test rig are used to acquire the intrinsic reaction rates of the NH 3 -SCR reactions over a Cu-based catalyst, as well as to obtain qualitative trends of the role of soot presence. The above reaction kinetics are then directly implemented in a physicochemical model of the transport and reaction processes in a wall-flowcatalyzed filter. This model is validated against medium-scale engine tests revealing the competitive effects of SCR and passive soot oxidation, by a simple superposition of SCR chemistry and soot oxidation chemistry. This indicates that proper modeling of the species diffusion processes in the channels, the soot layer, and the wall is sufficient to describe the inhibiting effect of NH 3 -SCR on soot oxidation. This allows for a straightforward decoupled model calibration process which can be used to develop efficient system design and dosing control methodologies. Finally, the model is applied to a much different SDPF scale relevant for large non-road engines. The necessary adaptations to the model parameters are discussed as well as a methodology to apply predictive simulation tools when the boundary conditions are changed.

show abstract

“…Das System kommt in zwei Ausführungen zum Einsatz, die sich neben der einheitlichen Verwendung eines DOC, DPF und SCR prinzipiell nur in der Bereitstellung des für die NO x -Reduktion notwendigen NH 3 unterscheiden. Dafür wird entweder ein adaptierter NO x -Speicherkatalysator (NSRC) oder eine konventionelle Harnstoff-Dosiereinheit in die Abgasanlage implementiert [30,31]. Der SCR-Katalysator in Bluetec I hat dabei insbesondere die Funktion, im mageren Betrieb durch den NSRC nicht konvertiertes NO x mittels NH 3 zu konvertieren, wobei das NH 3 vorab im fetten Betrieb im NSRC gebildet und im SCR zwischengespeichert wurde.…”

Section: Mehrkomponentige Abgasnachbehandlungssystemeunclassified

Exhaust Gas Aftertreatment in Mobile Systems: Status, Challenges, and Perspectives

Deutschmann

Grunwaldt

2013

Chemie Ingenieur Technik

View full text Add to dashboard Cite

Exhaust Gas Aftertreatment in Mobile Systems: Status, Challenges, and PerspectivesLooking at exhaust-gas after-treatment systems in its entirety leads to further improvement of emission control devices and to the accomplishment of future challenges such as lower legislative emission limits, new fuels, and more efficient engine concepts. This article provides an overview on the state-of-the art mobile exhaust-gas after-treatment devices. Current and future challenges are discussed in the light of present approaches such as hierarchical modeling reaching from DFT computations of molecular processes to CFD simulation of entire lines of exhaust-gas cleaning devices, close-to-reality emission control test benches and aging procedures, on-board diagnostics, and catalyst characterization at operating conditions and preferentially all length scales. In future, knowledge-based robot-controlled preparation and dynamic models coupled with information from real operation will significantly support research and development.

show abstract

The Development of Advanced 2-Way SCR/DPF Systems to Meet Future Heavy-Duty Diesel Emissions

Cited by 49 publications

References 7 publications

Soot and hydrocarbon oxidation over vanadia-based SCR catalysts

Soot and hydrocarbon oxidation over vanadia-based SCR catalysts

Interaction of NO x Reduction and Soot Oxidation in a DPF with Cu-Zeolite SCR Coating

Exhaust Gas Aftertreatment in Mobile Systems: Status, Challenges, and Perspectives

Contact Info

Product

Resources

About