Backpressure Optimized Metal Supported Close Coupled PE Catalyst - First Application on a Maserati Powertrain

On one hand, latest worldwide emissions legislation developments aim to reduce NOx and Particulate Matter (PM) emissions of all diesel engines, while on the other hand lower fuel consumption diesel engines are still required for lower fl eet average CO 2 emissions. As a consequence of the chosen CO 2 optimized combustion mode, the raw NOx emission increases and as such Selective Catalytic Reduction (SCR) technology will be the future choice for high effi ciency NOx after-treatment. This paper deals with SCR technology and its derivative SCRi ® technology, when diesel particle reduction is required, especially for Heavy Duty applications. Alongside the developed metal catalyst technologies, a complete SCR reducing agent dosing system is presented. Emission results gained with the SCR or SCRi ® technologies on European commercial engines illustrate the potential of these technologies for conversion of NOx and PM emissions. This enables drafting of a road map for future emission control solutions, considering the local situation in India, for upcoming legislations.

Section: Figure 1 Ls Substrate Structurementioning

confidence: 99%

SCR and SCRi^® as After-treatment Systems for Low CO₂ and Low NOx Vehicles

Jayat

Reck

Babu³

2011

“…The presence of cavities allows radial flow that has a very positive influence on flow distribution and backpressure [9].…”

Section: Pe-designmentioning

confidence: 99%

“…On the other hand, the presence of the cavities creates zones with very low mass transfer coefficient. Several results ([8], [9]) show that the use of a PE substrate usually leads to an improvement of total catalytic efficiency due to the better mixing of exhaust gas within the substrate and the higher exploitation of the entire catalytic volume.…”

Section: Mass Transfer Coefficient For Ls and Pe Designmentioning

confidence: 99%

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Turbulent Flow Metal Substrates: A Way to Address Cold Start CO Emissions and to Optimize Catalyst Loading

Presti

Pace

Carelli

et al. 2006

Self Cite

Modern Diesel Engines equipped with Common-Rail Direct Injection and EGR are characterized by an increasingly high combustion efficiency. Consequently the exhaust gas temperature, especially during a cold start, is significantly reduced compared to typical values measured in previous engine generations. This leads to a potential problem with CO emission limit compliance. The present paper deals with an experimental investigation of turbulent-flow metal substrates, carried out on a vehicle roller bench using a production 1.3 Liter diesel engine equipped passenger car. The tested metal supported catalysts proved to yield extremely high conversion rates both during cold start and in warm operation phase. The improved mass transfer efficiency of the advanced metal substrates is related on one hand to the optimized coating technology and, on the other hand, to the enhanced flow performance in the single converter channels which is caused by structured metal foils. Additionally different cost saving scenarios have been analyzed by means of both catalyst volume reduction and decreased PGM loading.

“…The PE-Metalit benefits from the larger energy density per heat capacity. Therefore, converter diameter can be increased to gain lower system back pressure [ 12].…”

Section: Cylinder1 Cylinder 2 Cylinder3 Cylinder4mentioning

confidence: 99%

Innovative Metallic Substrates for Exhaust Emission Challenges for Gasoline and Diesel Engines

Müller-Haas¹,

Rice²

2005

Increasingly stricter emission standards for gasoline and diesel engines accelerated the exhaust aftertreatment industry to develop high efficiency catalysts with innovative substrates. Engineers face thermodynamic and thermal management challenges to achieve system emission, noise and back pressure targets at minimum costs. This paper describes advanced substrate technology for exhaust after treatment systems for gasoline and diesel engines. The first part focuses on substrate technology solutions including high cell density substrates and advanced metallic substrates with structured and perforated foil material. This new substrate technology offers great potential to optimize the overall system efficiency through exhaust mixing within the catalyst at minimum back pressure. Transient temperature condition and available packaging space will have remarkable impact on system design and catalyst performance for future advanced combustion engines and hybrid vehicles.