Alleman Hall McCoy Russell & Tuttle LLP
Exhaust gas purification catalyst
Catalytic converter comprises a carrier having exhaust gas passages therein, a lower catalytic layer coated over the carrier and comprising hollow oxide powder loaded with catalytic metal, and an upper catalytic layer coated over the lower catalytic layer, directly exposed to exhaust gas flowing in the exhaust gas passages and comprising solid oxide powder loaded with catalytic metal. The hollow oxide powder may be ceria or alumina base oxide. Further it may be mixed oxide such as Ce—Zr mixed oxide or La contained alumina as well.
Mazda Motor Corporation
B B B B B Y B B
B01J B01J B01J B01J B01J Y02T B01D B01J
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Hiroshi Masaaki Akihide Seiji Hideharu Koichiro
Yamada Akamine Takami Miyoshi Iwakuni Harada