| abstract |
catalyst article for use in a small engine, method for producing a catalyst article, and small engine system. catalyst articles comprising substantially only a precious metal palladium component in a first catalytic layer and a rhodium component in a second catalytic layer and related methods of preparation and use are described. also described is a catalyst article comprising a first layer formed on a carrier substrate, wherein the first layer comprises a refractory metal oxide and has a surface that is substantially uniform; a second layer formed on the first layer, the second layer comprising i) an oxygen storage component that is about 50-90%, by weight, of the second layer and ii) a palladium component in an amount of about 2-5% by weight of the second layer, wherein the palladium component is substantially the metal of the platinum group only component, and a third palladium-free layer comprising a rhodium component supported on a thermostable oxygen storage component which is about 80-99% by weight of the second layer. one or more improved properties are exhibited by the catalyst article. |