Device for the purification of diesel exhaust gases

Details Device for the purification of diesel exhaust gases Device for the purification of diesel exhaust gases

2008-10-23

2011-11-15

Vanoy, Timothy (Department: 1734)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Solid component

C423S213700, C060S299000

Reexamination Certificate

active

08057768

ABSTRACT:
The invention relates to a special device for the purification of diesel exhaust gases, which device comprises, in the flow direction of the exhaust gas, an oxidation catalyst, a diesel particle filter with catalytically active coating, and, downstream of a device for introducing a reducing agent from an external reducing agent source, an SCR catalyst. The oxidation catalyst and the catalytically active coating of the diesel particle filter contain palladium and platinum. The ratio of the noble metals platinum and palladium in the overall system and on the individual components, oxidation catalyst and catalytically coated diesel particle filter, are coordinated with one another in such a way as to obtain firstly an optimum NO/NO2ratio in the exhaust gas upstream of the downstream SCR catalyst, and secondly optimum heating and HC conversion behaviour during an active particle filter regeneration.

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