Sulfur-containing organic compound assisted metal nanoparticle synthesis for three-way catalysis application
AssigneeJohnson Matthey Public Limited Company
InventorsDaniel Peter DePuccio, Kevin Charles Kistler, Dongxia Liu
Life of this patent
Estimating the term…
Abstract
A method of manufacturing a catalyst article, the method comprising: providing a slurry comprising a support material, palladium ions, alkaline-earth-metal ions and an organic compound, wherein the organic compound comprises a functional group selected from a sulfo group (—SO3H), a sulfonyl group (—S(═O)2—) and a sulfinyl group (—S(═O)—); disposing the slurry on a substrate; and heating the slurry to form nanoparticles of the palladium and nanoparticles of a sulfate of the alkaline earth metal on the support material.
Claims7
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 alkaline-earth metal sulfate nanoparticles;
- and
- wherein when a cross section of the first catalytic region of the catalyst article is subjected to area analysis by FE-EPMA under conditions of pixel (section) size of 0.34 μm ×0.34 μm and number of measured pixels (sections) of 256×256, a characteristic X-ray intensity (α:
- cps) of alkaline-earth metal element (Ae) and a characteristic X-ray intensity (β:
- cps) of the palladium (Pd) are measured for each pixel, and the Pearson correlation coefficient calculated using the resulting a and 0 in each pixel is designated as RAe/Pd, then the value of RAe/Pd is at least 0.75.
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 alkaline-earth metal sulfate nanoparticles;
- wherein the alkaline-earth metal sulfate nanoparticles have a crystallite size of from 0.1 nm to 30 nm;
- and
- wherein the palladium nanoparticles have a crystallite size of from 5 nm to 15 nm.
Dependencies are inferred from the claim text.