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US 12,129,779 B2Granted
Lean NOx trap plus low temperature NOx adsorber system for low temperature NOx trapping
AssigneeBASF SE
InventorMatthew T. Caudle
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Abstract
The present disclosure is directed to an emission treatment system for NOx abatement in an exhaust stream of a lean burn engine. The emission treatment system includes a lean NOx trap (LNT) in fluid communication with and downstream from the lean burn engine and a low-temperature NOx adsorber (LT-NA) in fluid communication with and downstream of the LNT. Further provided is a method for abating NOx in an exhaust stream from a lean burn engine utilizing the disclosed system.
Claims21
An emission treatment system for NOx abatement in an exhaust stream of a lean burn engine, the emission treatment system comprising:
- a lean NOx trap (LNT) comprising an oxygen storage component (OSC) and a first platinum group metal (PGM) component, wherein the LNT is in fluid communication with and downstream from the lean burn engine;
- and
- a low-temperature NOx adsorber (LT-NA) comprising a molecular sieve comprising a second PGM component, wherein the LT-NA is in fluid communication with and downstream of the LNT,
- wherein the LNT and LT-NA are disposed on a substrate in a zoned configuration, the substrate having an inlet end and an outlet end defining an overall length;
- wherein the LNT is disposed on the substrate extending from the inlet end to a length of from about 20% to about 100% of the overall length;
- and
- wherein the LT-NA is disposed on the substrate extending from the outlet end to a length of from about 20% to about 100% of the overall length.
4 more elements
Dependencies are inferred from the claim text.