| abstract |
The present invention relates to a process for the production of a catalyst comprising the steps of forming a first ternary catalyst on an inert catalyst support, said first ternary catalyst comprising a first layer on said inert catalyst support, comprising activated alumina, a cerium / zirconium mixed oxide and palladium, And a second layer comprising rhodium and being applied to the first layer and in direct contact with the exhaust gas to be purified, wherein the second layer comprises no cerium and cerium containing materials) Described is a three-way catalyst system comprising a second three-way catalyst located upstream of a first three-way catalyst. |