Nixon Peabody LLP
Catalyst for cleaning exhaust gas
 In the exhaust gas purifying catalyst (3), palladium is contained as a catalytic component and cerium oxide and (Ce, Pr) compound oxide is contained as a promoter. Now, the weight ratio of cerium oxide to (Ce, Pr) compound oxide is set between 9/1 and 7/3, and the ratio of praseodymium to cerium in the (Ce, Pr) compound oxide is set between 3 mol % and 50 mol %. In this way, because in this exhaust gas purifying catalyst (3), palladium with high low-temperature activity is used for a catalytic component, the exhaust gas purifying performance at low temperature is improved. And because cerium oxide and (Ce, Pr) compound oxide improves catalytic activity of palladium at high temperature, the exhaust gas purifying performance at high temperature, in particular, NOx purifying performance, is improved. 
Mazda Motor Corporation
B B B Y B
B01D B01D B01J Y02T B01D
inventional additional inventional additional additional
Hiroshi Yuki Kenji Kazuo Hiroshi Taeko Takashi Kenichi Toshitsugu Masahiko Satoshi
Yamada Koda Okamoto Misonoo Murakami Shimizu Takemoto Yamamoto Ueoka Shigetsu Ichikawa