Finnegan, Henderson, Farabow, Garrett & Dunner, LLP
Exhaust gas purification catalyst
An exhaust gas purification catalyst includes: a lower catalyst layer that contains a ceria-zirconia mixed oxide having 50 to 70 mass % of CeO2 and 5 mass % or more of Pr2O3 and carries at least one of Pt and Pd; and an upper catalyst layer that contains at least zirconia and carries at least Rh, wherein the total amount of CeO2 per liter of the carrier base is 15 to 30 g. Because the amount of CeO2 is small, formation of H2S is suppressed and a high capability of adsorbing and releasing oxygen is brought out in spite of the small amount of CeO2.
Toyota Jidosha Kabushiki Kaisha
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Keizo Akemi Takahiro Tadashi Yusuke Naoki Masahiko
Hiraku Satou Fujiwara Suzuki Kawamura Takahashi Takeuchi