Integrated SCR and AMOx catalyst systems
AssigneeBASF SE
InventorsR. Samuel Boorse, Matthew T. Caudle, Martin Dieterle, Sanath V. Kumar, Kenneth E. Voss
Life of this patent
Estimating the term…
Abstract
Catalysts and catalytic articles for treating exhaust gas streams are described. In one or more embodiments, a catalyst system includes a first zone to abate nitrogen oxides by selective catalytic reduction, a second zone to oxidize ammonia and a third zone to oxidize carbon monoxide and hydrocarbons. Methods for treating the exhaust gas stream are also provided. Methods of making and using such catalysts and catalytic articles are also described.
Claims15
A catalytic article for treating an exhaust gas stream containing particulate matter, hydrocarbons, CO and ammonia, the article comprising:
- a substrate having an inlet end and an outlet end defining an axial length;
- a first catalyst coating including a platinum group metal, the first catalyst coating extending from the outlet end toward the inlet end over less than the entire axial length of the substrate;
- and
- a second catalyst coating including a catalyst for selective catalytic reduction (SCR) of nitrogen oxides, the second catalyst coating extending from the inlet end toward the outlet end over less than the entire axial length of the substrate and overlapping a portion of the first catalyst coating.
An emissions treatment system comprising:
- a diesel engine emitting an exhaust stream including particulate matter, NOx and carbon monoxide;
- a first substrate selected from the group consisting of a wall-flow substrate and a flow-through substrate;
- and
- the first substrate having an inlet end and an outlet end defining an axial length positioned downstream of and in flow communication with the diesel engine, the substrate having a first catalyst coating including a platinum group metal, the first catalyst coating extending from the outlet end toward the inlet end over less than the entire axial length of the substrate, and a second catalyst coating including a catalyst for selective catalytic reduction (SCR) of nitrogen oxides, the second catalyst coating extending from the inlet end toward the outlet end over less than the entire axial length of the substrate and overlapping a portion of the first catalyst coating layer.
Dependencies are inferred from the claim text.