Particle Oxidation Catalyst (POC®) - From Diesel To GDI - Studies on Particulate Number and Mass Efficiency Ecocat Oy

Format:

Conference/Event

Author/Creator:

Kinnunen, Kinnunen, author.

Contributor:

Czika, Werner

Matilainen, Pekka

Russ, Gerald

Scheder, Daniel

Waters, David

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

Legislations worldwide have started imposing stringent emissionstandards for particulate matter (PM) emitted by diesel engines.The main reason for these actions is the adverse effects on humanhealth caused by particle emissions. Conventional ceramic DieselParticulate Filters (DPF) have proven exceptionally effective inreducing particulate emissions with efficiencies of 90% or more.However, these filters require regular active regenerations as wellas periodical ash removal in order to avoid a blockage of theexhaust line. These procedures are both costly and complex and as aresult alternative aftertreatment solutions have been developed.One of these solutions is the Particle Oxidation Catalyst, POC-X.The main aim of the POC-X is not to equal the high efficiencies ofthe DPF, but to achieve the best possible particle reductionwithout creating the risk of blocking or the need for complexfilter regeneration procedures.The substrate used in the POC-X is a fine mesh screen made ofmetal, which is rolled into a cylinder and placed into the exhaustline. The unique construction forms tortuous channels which runthrough the filter. This means that the exhaust gas can either flowthrough the substrate cells, which act as trapping agents for sootparticles, or along the tortuous channels should the filter becomeoverloaded. Additionally, a specially developed washcoat is appliedto the substrate in order to facilitate the production of Nitrogendioxide (NO₂), which aids the regeneration process of thefilter.In an experimental study, the performance of the POC-X has beeninvestigated using a 1.6-liter, Euro 4 diesel engine on a dynamictest bench. Sophisticated exhaust gas measurement equipmentsupplied by Horiba was used to evaluate soot, soluble organicfraction (SOF), particle number (PN) as well as gaseous emissionsin real time (1 Hz) during stationary and dynamic measurements. Forthe dynamic tests, the new European driving cycle (NEDC) was used.The combination of these measurements provided an accurateperformance picture of the POC-X. By evaluating a variety of POC-Xsizes, the optimum filter dimensions and key parameters weredetermined. Furthermore, by conducting a series of particle sizedistribution measurements using a scanning mobility particle sizer(SMPS), the relationship between particle size and filterefficiency was investigated. Based on these results, a calculationmodel is being developed, which will support the design andapplication of the POC-X based on engine operating parameters andfilter dimensions. This will allow for efficiently designedsolutions to specific applications.As particulate emission limitations are also being implementedfor gasoline direct injection (GDI) technologies, a new POCprototype has been tested in a GDI vehicle with a short, on-road,durability run

Notes:

Vendor supplied data

Publisher Number:

2012-01-0845

Access Restriction:

Restricted for use by site license