Umicore Shokubai Japan Co., Ltd.

Shigekazu Minami

Masanori Ikeda

Hirotaka Kuno

Masashi Nakashima

Hideki Goto

Yuji Ogino

Kosuke Mikita

Takahiro Ikegami

Kenji Ashikari

Kazuyoshi Komata

Yuta Akasaka

Yasuyuki Takeda

Kazuyoshi Komota

In an exhaust gas purification catalyst, a catalytic component containing a first oxide, a second oxide, and a precious metal is supported on a three-dimensional structure; the ratio of the amount of precious metal supported on the first oxide to the total amount of precious metal supported on the first oxide and precious metal supported on the second oxide, or the ratio of the amount of precious metal supported on the second oxide to the total amount of precious metal supported on the first oxide and precious metal supported on the second oxide is 70% or more to 100% or less, as measured by an electron probe microanalyzer (EPMA); and the amount of carbon monoxide that the precious metal can adsorb per unit mass is 15 mL/g or more to 100 mL/g or less.

Exhaust gas purification catalyst, method of purifying exhaust gas, and method of manufacturing exhaust gas purification catalyst

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 and yttrium 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 yttrium contained in the first region () and/or the second region () is higher than the concentration of yttrium contained in the region ().

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

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 rhodium contained in the first region () is higher than the concentration of rhodium contained in the second region ().

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 ().

An object is to provide a means for suppressing a deterioration in catalytic performance even after being exposed to high temperature exhaust gas containing a phosphorus compound for a long period of time. An exhaust gas purifying catalyst including palladium supported on cerium-aluminum composite oxide containing cerium at from 3 to 60% by mass in terms of cerium oxide.

Catalyst for purification of exhaust gas from internal combustion engine and exhaust gas purifying method using the catalyst

The present invention provides an exhaust gas purifying catalyst which can maintain high catalyst activity even after the exhaust gas purifying catalyst is exposed to an exhaust gas at a high temperature for a long period of time. The exhaust gas purifying catalyst contains a Pd&#x2014;Pr complex and PdO, and the Pd&#x2014;Pr complex is represented by PrPdO, where a=1 to 3, b=1 to 10, and c=1 to 6.

Exhaust gas purifying catalyst and method for purifying exhaust gas

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.

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Himeji, Japan

Shigekazu Minami