Investigations on Chemical Ageing of Diesel Oxidation Catalysts and Coated Diesel Particulate Filters 2010-01-1212
For medium- and heavy-duty diesel engines, the development of
new catalyst technologies and particulate filters is necessary to
fulfill increasingly stringent emission regulations. An important
aspect is the durability of the after-treatment system and
therefore its efficiency over lifetime. Lubrication oil additives
contain components such as phosphorous or zinc to ensure engine
durability. Diesel oxidation catalyst (DOC) and coated diesel
particulate filter (cDPF) catalytic coatings are negatively
influenced by contamination on the surface with these components
(chemical ageing). The components have a negative impact on the
exhaust after-treatment systems performance. Additionally the cDPF
is filled with oil ash.
Engine tests are conducted to analyze the effect of lubrication
oil additives on after-treatment system performance. In one study,
lubrication oil with increased sulfur ash content is used. In
another study, the same liquid oil is additionally sprayed directly
into the after-treatment system. The performance of both
after-treatment systems is measured at regular intervals during
testing. The results show that the NO₂ make on DOC and cDPF
deteriorates severely due to chemical and thermal ageing. However
with increased operation time, the effects stabilize. In addition
to the test bench investigations, the accumulation of poisoning
elements on the washcoat surface is analyzed using XRF analysis.
Ash accumulation in the cDPF is studied and ash composition is
analyzed. Selected results of this study are compared to results of
measurements on durability run aged after-treatment systems from
EPA-07 development.
Citation: Lanzerath, P., Traebert, A., Massner, A., and Gaertner, U., "Investigations on Chemical Ageing of Diesel Oxidation Catalysts and Coated Diesel Particulate Filters," SAE Technical Paper 2010-01-1212, 2010, https://doi.org/10.4271/2010-01-1212. Download Citation
Author(s):
Peter Lanzerath, Anke Traebert, Alexander Massner, Uwe Gaertner
Affiliated:
Daimler AG
Pages: 9
Event:
SAE 2010 World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Diesel Exhaust Emission Control, 2010-SP-2287
Related Topics:
Diesel particulate filters
Lubricating oils
Particulate filters
Diesel / compression ignition engines
Environmental regulations and standards
Catalysts
Chemicals
Corrosion
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