Cataler Corporation

Takahiro Harada

Ryota Nakashima

Ryota Onoe

Keiichi Narita

Chihiro Kasuya

Yu Sakurada

Michio Tanaka

Hironobu Kunioku

Kazuhiko Ito

An exhaust gas purifying catalyst having first carrier particles, second carrier particles, and precious metal catalyst particles supported on the first and second carrier particles, wherein: the first carrier particles contain ceria, zirconia, and a rare-earth oxide other than ceria; the second carrier particles contain a rare-earth oxide other than ceria, and may contain ceria and zirconia; the contained proportion of ceria and zirconia in the first carrier particles is higher than the contained proportion of ceria and zirconia in the second carrier particles; the contained proportion of the rare-earth oxide in the second carrier particles is higher than the contained proportion of the rare-earth oxide in the first carrier particles; and the contained proportion of ceria in the first carrier particles is 45 wt % or less, while the precious metal catalyst particles include rhodium particles.

Exhaust gas purifying catalyst and production method therefor, and exhaust gas purification device using same

An exhaust gas purification catalyst comprises a substrate; a catalyst layer formed on the substrate and containing at least palladium (Pd) and rhodium (Rh) as a metal functioning as an oxidation and/or reduction catalyst. The catalyst also comprises a carrier that supports the metal, and an OSC material having oxygen storage capacity. The catalyst layer has, when disposed in the exhaust pipe, a front section positioned upstream in an exhaust gas flow direction within the exhaust pipe, and a rear section positioned downstream of the front section in the exhaust gas flow direction. The front section contains palladium (Pd) but does not contain the OSC material, and a proportion, at which the front section is formed from an upstream leading end in the exhaust gas flow direction, is 10% to 40% with respect to 100% of a total length of the substrate.

Exhaust gas purification catalyst

Provided is an exhaust gas purification catalyst with excellent durability against exhaust gas including a poisoning substance. The exhaust gas purification catalyst includes a porous substrate, a catalyst coating layer formed on the porous substrate, and a dummy coating layer formed on the outermost surface of the catalyst coating layer. The catalyst coating layer has a carrier and a noble metal catalyst supported on the carrier. The dummy coating layer includes a carrier having at least alumina and does not include a noble metal catalyst. The dummy coating layer is formed to have a length which, from the end on the exhaust gas inlet side, is 10% to 70% of the entire length of the catalyst coating layer along the exhaust gas flow direction.

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Kakegawa, Japan

Takahiro Harada