Lnt catalyst with enhanced nitrogen oxide storage capacity at low temperature
AssigneeHyundai Motor Company
InventorChang Ho Jung
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Abstract
Disclosed is a lean NOx trap (LNT) catalyst with enhanced NOx storage capacity at low temperature. More particularly, an LNT catalyst with enhanced NOx storage capacity at low temperature and significantly inhibited thermal desorption is prepared by coating a washcoat on a honeycomb-type carrier and drying and baking the same. The washcoat contains a first catalyst powder in which barium (Ba) and a precious metal are supported on a ceria support, and a second catalyst powder in which a precious metal is supported on a magnesium (Mg)-substituted alumina support The LNT catalyst of the present invention is useful as a NOx reducing catalyst for a passenger diesel vehicle.
Claims11
A lean NOx trap (LNT) catalyst comprising:
- a washcoat of a first catalyst powder and a second catalyst powder coated, dried and baked on a honeycomb-type carrier,
- the first catalyst powder comprising barium (Ba) and a precious metal supported on a ceria support, and
- the second catalyst powder comprising a precious metal is supported on a magnesium (Mg)-substituted alumina support.
Dependencies are inferred from the claim text.