Sulfur-containing organic compound assisted metal nanoparticle synthesis for three-way catalysis application

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 the alkaline earth metal sulfate nanoparticles have a crystallite size of from 0.1 nm to 30 nm.

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.

A method of manufacturing a catalyst article, the method comprising:

• providing a solution comprising 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)—);
• providing a support material;
• contacting the solution with the support material to form a slurry;
• 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.