Lean hc conversion of twc for lean burn gasoline engines
AssigneeBASF SE
InventorsMarcus Hilgendorff, Wen Mei Xue, Cesar Tolentino
Life of this patent
Estimating the term…
Abstract
The present invention relates to a catalyst composition comprising a carrier substrate, a layer (i) coated on said carrier substrate comprising at least one precious group metal, a layer (ii) comprising Rh, and a layer (iii) comprising Pd and/or Pt and being substantially free of Ce, Ba and Rh, wherein the layer (iii) has a lower weight than the layer (i) or the layer (ii). Furthermore, the present invention relates to a method for treating an exhaust gas stream using said catalyst composition.
Claims14
A catalyst composition comprising:
- a carrier substrate;
- a layer (i) coated on said carrier substrate comprising at least one precious group metal;
- a layer (ii) comprising Rh;
- a layer (iii) comprising Pd and/or Pt and being substantially free of Ce, Ba and Rh,
- wherein the layer (iii) has a lower weight than the layer (i) or the layer (ii).
A method for treating an exhaust gas stream, the method comprising the steps of:
- (i) providing a catalyst composition comprising:
- a carrier substrate;
- a layer (i) coated on said carrier substrate comprising at least one precious group metal;
- a layer (ii) comprising Rh;
- a layer (iii) comprising Pd and/or Pt and being substantially free of Ce, Ba and Rh,
- wherein the layer (iii) has a lower weight than the layer (i) or the layer (ii);
- (ii) contacting said exhaust gas stream with said catalyst composition for the treatment of exhaust gas emissions.
Dependencies are inferred from the claim text.