Methods for preparing catalyst systems

A method for preparing a catalyst system, the method comprising:

• providing a catalytic substrate comprising a catalyst support having a surface with a plurality of metal catalytic nanoparticles bound thereto, wherein the metal catalytic nanoparticles comprise one or more of ruthenium, rhodium, palladium, osmium, iridium, platinum, rhenium, copper, silver, and gold;
• and
• physically combining or electrostatically combining the catalytic substrate with a plurality of oxide coating nanoparticles to provide a coating of oxide coating nanoparticles on the surface of the catalytic nanoparticles,
• wherein physically combining comprises combining without the use of solvents via ball milling, blending, acoustic mixing, or theta composition, and the oxide coating nanoparticles comprise one or more oxides of aluminum, cerium, zirconium, titanium, silicon, magnesium, zinc, barium, lanthanum, iron, strontium, and calcium.

A method for preparing a catalyst system, the method comprising:

• providing a catalytic substrate comprising a catalyst support having a surface with a plurality of metal catalytic nanoparticles bound thereto, wherein the catalyst support comprises alumina or ceria, and the metal catalytic nanoparticles comprise one or more metals selected from the list consisting of ruthenium, rhodium, palladium, osmium, iridium, platinum, rhenium, copper, silver, and gold;
• and
• physically combining the catalytic substrate with a plurality of oxide coating nanoparticles to provide a coating of oxide coating nanoparticles on the surface of the catalytic nanoparticles,
• wherein physically combining comprises combining without the use of solvents via ball milling, blending, acoustic mixing, or theta composition, and the oxide coating nanoparticles comprise one or more oxides of aluminum, cerium, zirconium, titanium, silicon, magnesium, zinc, barium, iron, strontium, and lanthanum.