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NO2 Reduction, Passive and Active Soot Regeneration Performance of a Palladium-Base Metal Coating on Sic Filters
Abstract:
Silicon carbide diesel particulate filter (DPF) is now
recognized as the most effective and robust way to reduce not only
the mass but also the number of emitted particles on diesel
passenger cars. Widespread use of expensive catalytic
platinum-containing coatings has contributed to increased harmful
NO₂ emissions.
A novel low-cost palladium-base metal coating, BMC-211, was
developed which assists soot regeneration by oxygen transport and
which actively removes NO₂ still having comparable passive and
active soot regeneration properties. The novel coating was tested
against a traditional commercial platinum coating on a modern
series-produced car, on chassis dynamometer and on engine test
bench. The test results obtained demonstrate that palladium-base
metal coating has significantly lower NO₂ emission during NEDC
tests compared to traditional Pt-coating, both for fresh and aged
samples, and showed at least the same performance concerning
passive regeneration, forced regeneration, pressure drop, regulated
NEDC emissions and secondary emissions. The silicon carbide filter
material is not mechanically affected by the coating.