SAE 2014 Heavy-Duty Diesel Emissions Control Symposium
Technical Session Schedule
Thursday, September 18
Catalyst and Substrate Developments
(Session Code: HDD400)
Room Bankett High 13:30
Moderators - Cecile Favre, AECC
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|Cordierite and SiC Filters for On-Road and Off-Road Heavy Duty Applications
The presentation summarises the development status for this Cordierite and SiC Filters for on-road and off-road heavy duty applications. An outlook will be given on potential filter material options for future post EU VI and Tier V applications. Special focus is on particulate number emission results and pressure drop. For CSF, thin wall filter materials in various test cycles are investigated for filter design. Especially SCR catalysts on DPF require a good selection of the filter material to achieve both a sufficient coating and particulate number test results in on-road and off-road test cycles. The DPF material selection depends also pressure drop performance. To get best compromise between NOx performance and backpressure the coating and material has to be optimised and the mean pore size of the DPF adjusted. Further development work on material and coating optimisation is needed and still on going.
Takashi Aoki, NGK Insulators, Ltd.; Stefan Fischer, Yasuyuki Furuta, Kathrin Heil, NGK Europe GmbH; Tom Kondo, NGK Insulators, Ltd.; Adolf Schaefer-Sindlinger, Claus Dieter Vogt, NGK Europe GmbH; Kazuya Yuuki, NGK Insulators, Ltd.
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|Future Challenges and Incoming Solutions in the Global Catalyst-based Emission Control Area
Emission control legislation in the developed markets of Europe, North America and Japan has resulted in the reduction of millions of tonnes of potential emissions from Heavy Duty Diesel (HDD) vehicles, leading to major environmental benefits. In order to meet the regulations, sophisticated catalyst-based systems have been developed which typically reduce emissions of CO, HC, NOx and Particulate Matter (PM) by over 90%. These systems typically comprise a Diesel Oxidation Catalyst (DOC), Catalysed Soot Filter (CSF), Selective Catalytic Reduction (SCR) catalysts, and an Ammonia Slip Catalyst (ASC).
Despite the very high efficiencies of these systems, which are maintained for half a million miles and more, there is continued drive for further improvements to enable, for example, additional increases in fuel efficiency, which is a key driver in the HDD area, particularly in the on road sector. There are also proposals from California’s ARB for an optional, much tighter, NOx standard on the 2020 timeframe. This presentation will outline the routes that may be taken to increase system NOx conversion efficiencies even further.
The current regulations in the non-road area can generally be met with simpler systems, mainly due to the higher legislated PM emission level and the absence of a specific Particle Number requirement. This presentation will discuss the differences between the on road and non-road legislation and outline the emission control systems that have resulted from these differences. Likely future systems in the non-road sector, particularly driven by the expected European Stage V regulations, will also be outlined.
Looking at the broader, global market, emission levels corresponding to EUIV are coming into force in China and India, and this paper will discuss the systems being used to meet the regulations in these markets. We will also look ahead to the kind of emission control architectures likely to be used in these markets as they move to EUV and then EUVI compliance.
Andrew P. Walker, Johnson Matthey Inc.
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|Future Aftertreatment Concepts for Heavy Duty Application
With Euro VI being in place, drivers for further development of exhaust aftertreatment systems will be primarily fuel efficiency, cost reduction and durability improvements. Performance enhancements of individual components are possible and ongoing. In order to cope with reduced exhaust temperatures new system approaches are favourable. Among these, SCR on filter concept is the most advanced. Open questions and challenges will be discussed and analyzed. This includes filtration efficiency, filter regeneration, NO2 performance as well as ash and soot effects. Also, the standard muffler layout has to be questioned.
Andreas Geisselmann, Umicore AG & Co. KG