Morrison & Foerster LLP
Catalyst for purifying exhaust gas
 A catalyst (3) for purifying an automotive exhaust gas, in which inner and outer catalytic layers (5,6), each of which has a base material and a catalytic material held by the base material, are stratified on a honeycomb-type carrier (4). In the catalyst (3), the inner catalytic layer (5) contains a palladium component as the catalytic component. Further the inner catalytic layer (5) contains a nickel oxide component for preventing poisoning of the palladium component. On the other hand, though the outer catalytic layer (6) contains a rhodium component as the catalytic component, it does not contain a palladium component nor a nickel oxide component. 
Mazda Motor Corporation
B B B Y Y
B01J B01D B01J Y02T Y02A
inventional inventional inventional additional additional
Taeko Hiroshi Takashi Kazunari Keiko Hiroshi Masayuki Yuki
Shimizu Yamada Takemoto Komatsu Matsui Murakami Koishi Koda