Cataler Corporation

Santoku Corporation

Kyosuke Murakami

Kenichi Taki

Ryota Onoe

Satoshi Matsueda

Keiichi Narita

Tadatoshi Murota

Takashi Onozuka

Michio Tanaka

Yuki Takesue

Shigeru Ono

Tomonori Tahara

Shunsuke Haga

Tomohiro Chiba

This exhaust gas cleaning catalytic device includes a base material and a first catalyst coat layer on the base material. The first catalyst coat layer has a pre-stage section on an exhaust gas flow upstream side, and a post-stage section on an exhaust gas flow downstream side. The first catalyst coat layer pre-stage section and post-stage section each contain inorganic oxide particles and rhodium supported by the inorganic oxide particles, while at least some of the inorganic oxide particles contain ceria. The ceria amount per unit length of the first catalyst coat layer post-stage section is larger than the ceria amount per unit length of the first catalyst coat layer pre-stage section. The first catalyst coat layer pre-stage section is disposed in such a manner that the end portion on the exhaust gas flow upstream side thereof is in direct contact with the exhaust gas flow.

Exhaust gas cleaning catalytic device

A Pd-supporting Zr-based composite oxide wherein by having a Zr-containing composite oxide support and Pd supported thereon and by showing, upon XAFS (X-ray absorption fine structure) analysis, a maximum peak in a Pd bond distance range of 2.500-3.500 &#x212b;, the maximum peak being located in a position of 3.050-3.110 &#x212b;.

Pd-supporting Zr-based composite oxide

An exhaust gas purification catalyst of the present invention is provided with a baseand a catalyst coat layer. The catalyst coat layer is provided with Rh and Pd as noble metal catalysts. Herein Rh is disposed in a first-stage upper layer A and a second-stage upper layer C, and Pd is disposed in the first-stage upper layer A and a first-stage lower layer B, and in a second-stage lower layer D. A mass ratio (A/A) of Pd to Rh, disposed in first-stage upper layer A is 0.5&#x2264;(A/A)&#x2264;3.

Exhaust gas purification catalyst

An exhaust gas purifying catalyst according to the present invention is provided with a base materialand a catalyst-coated layer. The catalyst-coated layeris provided with a lower layerand an upper layer. The upper layercontains Rh and/or Pt as a noble metal catalyst. The lower layercontains Pd as a noble metal catalyst. The lower layeris provided with a front-stage lower layerpositioned on an upstream side and a rear-stage lower layerpositioned on a downstream side. The front-stage lower layeris a Ce-free layer that does not contain a Ce-containing oxide. The rear-stage lower layeris a Ce-containing layer that contains a Ce-containing oxide with a pyrochlore structure.

Exhaust gas purifying catalyst

Growing community of inventors

Shizuoka, Japan

Kyosuke Murakami