Umicore Shokubai Japan Co., Ltd.

Kazuyoshi Komata

Yuji Ogino

Masanori Ikeda

Shigekazu Minami

Masashi Nakashima

Hirotaka Kuno

Hideki Goto

Kenji Ashikari

Yuzo Hamada

In order to provide an exhaust gas purification catalyst capable of purifying hydrocarbons, carbon monoxide, and nitrogen oxides in exhaust gas at low temperatures, the exhaust gas purification catalyst according to the present invention includes: a region () containing palladium on a three-dimensional structure (), and a first region () and a second region () provided on the region () in order from an inflow side of exhaust gas to an outflow side of exhaust gas. The concentration of neodymium contained in the first region () is higher than the concentration of neodymium contained in the second region ().

Exhaust gas purification catalyst and exhaust gas purification method using the same

The present invention provides exhaust gas purification catalyst for an internal combustion engine, and exhaust gas purification method using the catalyst. The present invention provides the exhaust gas purification catalyst including a support, a first catalyst layer on an upstream side, a second catalyst layer on a downstream side, and a third catalyst layer. In the exhaust gas purification catalyst, the upstream portion of the third catalyst layer is present on the first catalyst layer, the downstream portion of the third catalyst layer is present on the second catalyst layer, and in the middle portion between the upstream portion and the downstream portion of the third catalyst layer is present between the first catalyst layer and the second catalyst layer.

Exhaust gas purification catalyst for internal combustion engine, and exhaust gas purifying method using exhaust gas purification catalyst

As a way to suppress deterioration of catalytic performance in an exhaust gas purification catalyst even after being exposed to an exhaust gas containing a phosphorus compound, an exhaust gas purification catalyst is provided. The catalyst purifies an exhaust gas containing a phosphorus compound, and the catalyst includes a catalyst layer containing rhodium (Rh), palladium (Pd), and either a ceria-zirconia-lanthana complex oxide or a ceria-zirconia-lanthana-yttria complex oxide as catalyst active components. Further, an average value of distances between Rh particles and the nearest Pd particles of the Rh and the Pd is within 4000 nm, a weight ratio of the Pd to the Rh is from 0.2 to 4.9, and a content rate of yttria in the ceria-zirconia-lanthana-yttria complex oxide is 19% by weight or less.

Exhaust gas purification catalyst and exhaust gas purification method using said catalyst

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Himeji, Japan

Kazuyoshi Komata