Development, validation and application of a model for an SCR catalyst coated diesel particulate filter

Watling, Timothy C.; Ravenscroft, Maya R.; Avery, Graham

doi:10.1016/j.cattod.2012.02.007

Cited by 88 publications

(50 citation statements)

References 8 publications

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“…As expected [13], the O 2 -driven soot combustion showed a very limited activity (Fig. 6a) below 400°C, which represents a typical threshold temperature for the reactions between soot and O 2 over metalexchanged zeolites [7]:…”

Section: Effect Of No X On Soot Combustionsupporting

confidence: 69%

“…In view of the higher concentrations of CO x detected below 400°C (Fig. 6c), we can conclude that the presence of 250 ppm of NO 2 enhanced the lowtemperature soot combustion due to the occurrence of [7,14]:…”

Section: Effect Of No X On Soot Combustionmentioning

confidence: 74%

“…Apart from the technological challenge of merging the deNO x and PM control functionalities, the performance of the SCRF®, compared to that of the individual SCR and DPF devices, is a key aspect. The crossinteractions between the SCR and DPF functions for the general case of a soot-loaded SDPF must be considered [6][7][8]. Examples are the competitive NO 2 consumption by the SCR reactions and the passive soot oxidation or the trade-off that needs to be made when choosing the optimal washcoat amount to balance between deNO x performance, filtration efficiency and pressure drop behavior.…”

Section: Introductionmentioning

confidence: 99%

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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.

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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.

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Section: Effect Of No X On Soot Combustionsupporting

confidence: 69%

Section: Effect Of No X On Soot Combustionmentioning

confidence: 74%

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.

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“…Thus, new devices, such as the Selective Catalytic Reduction Filter (SCRF) system, are gaining in interest. SCRF consists of the combination into a single wall-flow monolith of soot filtration and nitrogen oxides (NO x ) abatement capability by coating the porous substrate with a NO x Selective Catalytic Reduction (SCR) catalyst [7]. Despite the potential improvement of this solution in terms of DPF passive regeneration, SCR light-off and conversion efficiency at low temperature, the combined chemical behavior of soot and NO x is still suggesting doubts concerning the overlapping of temperature ranges, which can lead to a final slight loss of NO x abatement and passive regeneration capability [8].…”

Section: Introductionmentioning

confidence: 99%

On the Impact of Particulate Matter Distribution on Pressure Drop of Wall-Flow Particulate Filters

et al. 2017

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Wall-flow particulate filters are a required exhaust aftertreatment system to abate particulate matter emissions and meet current and incoming regulations applying worldwide to new generations of diesel and gasoline internal combustion engines. Despite the high filtration efficiency covering the whole range of emitted particle sizes, the porous substrate constitutes a flow restriction especially relevant as particulate matter, both soot and ash, is collected. The dependence of the resulting pressure drop, and hence the fuel consumption penalty, on the particulate matter distribution along the inlet channels is discussed in this paper taking as reference experimental data obtained in water injection tests before the particulate filter. This technique is demonstrated to reduce the particulate filter pressure drop without negative effects on filtration performance. In order to justify these experimental data, the characteristics of the particulate layer are diagnosed applying modeling techniques. Different soot mass distributions along the inlet channels are analyzed combined with porosity change to assess the new properties after water injection. Their influence on the subsequent soot loading process and regeneration is assessed. The results evidence the main mechanisms of the water injection at the filter inlet to reduce pressure drop and boost the interest for control strategies able to force the re-entrainment of most of the particulate matter towards the inlet channels' end.

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“…16,17 In the same year, Kumar et al considered three different alcohol-diesel blends such as diesel-methanol, diesel-ethanol, and diesel-butanol and brought some critical information about the fuel properties, the economics of production and their effect on engine performance and emission. 18 Pine oil-diesel blends in a single cylinder, direct injection diesel engine was studied. The results showed that fueling with 100% pine oil under the full load condition decreased the CO, HC, and smoke emissions, whereas the nitrogen oxides (NOx) emission increased.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Performance, Combustion and Emission Characteristics on Biofuel of Novel Pine Oil

2017

RJC

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Increasing fuel prices lead to developing an alternative renewable fuel for internal combustion engines. Pine oil possesses lower viscosity, boiling point and flash point, similar to other plant based fuels like ethanol and eucalyptus oil. Pine oil has been identified to contain terpineol, a higher alcohol, along with pinene, which is an alicyclic hydrocarbon. In this research work, the various performance and emission characteristics of a single cylinder direct injection diesel engine were studied by using an alternative fuel of the biofuel mixed with pine oil and its blends. The results were compared with standard diesel fuel. From the results, it was found that there is a slight increase in brake thermal efficiency and a decrease in brake specific fuel consumption in all pine blended fuels when compared with regular diesel fuel. The use of pine oil resulted in lower emissions of carbon monoxide, hydrocarbons and increased emissions of nitrogen oxides.

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Development, validation and application of a model for an SCR catalyst coated diesel particulate filter

Cited by 88 publications

References 8 publications

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

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

On the Impact of Particulate Matter Distribution on Pressure Drop of Wall-Flow Particulate Filters

Analysis of Performance, Combustion and Emission Characteristics on Biofuel of Novel Pine Oil

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