| abstract |
A multilayer three-way conversion catalyst having the ability to simultaneously catalyze the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides is disclosed. A catalyst material having four or more layers with a carrier is provided, wherein each layer comprises a support, three or more layers comprising a precious metal component, and one or more layers comprising an oxygen storage component (OSC). The catalytic material may further comprise a fifth layer, wherein at least four layers comprise a precious metal component, at least one layer comprises an oxygen storage component, and at least one layer is substantially free of oxygen storage component . |