Catalyst article having improved barium distribution
AssigneeJohnson Matthey Public Limited Company
InventorsQinghe ZHENG, Jing LU, Michael HOWARD
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Abstract
The present invention provides a method of manufacturing a catalyst article, the method comprising: providing a substrate; providing a washcoat slurry, the washcoat slurry comprising a solvent, a support material, platinum group metal (PGM) ions, barium ions and a chelating agent of formula (1); coating the substrate with the washcoat slurry to provide a coated substrate; and heating the coated substrate to calcine the washcoat slurry; wherein formula (1) is defined by: wherein R is CH2OH, COOH or wherein R′ is CH2OH or COOH.
Claims20
A method of manufacturing a catalyst article, the method comprising:
- providing a substrate;
- providing a washcoat slurry, the washcoat slurry comprising a solvent, a support material, platinum group metal (PGM) ions, barium ions and a chelating agent of formula (1);
- coating the substrate with the washcoat slurry to provide a coated substrate;
- and
- heating the coated substrate to calcine the washcoat slurry;
- wherein formula (1) is defined by:
- wherein R is CH2OH, COOH or
- wherein R′ is CH2OH or COOH.
A washcoat slurry comprising a solvent, a support material, platinum group metal (PGM) ions, barium ions and a chelating agent of formula (1):
- wherein R is CH2OH, COOH or
- wherein R′ is CH2OH or COOH.
A catalyst article for use in an emissions treatment system, the catalyst article comprising:
- a substrate;
- and
- a first catalytic region on the substrate;
- wherein the first catalytic region comprises a support material, palladium nanoparticles and barium carbonate nanoparticles;
- and
- wherein the palladium nanoparticles have a mean crystallite size of from 5 to 25 nm and the barium carbonate nanoparticles have a mean crystallite size of from 25 to 36 nm.
Dependencies are inferred from the claim text.