Cataler Corporation

Toyota Jidosha Kabushiki Kaisha

Shogo Kawamura

Nobuyuki Takagi

Isao Naito

Hiroki Nihashi

Tomomasa Aikawa

Masahide Miura

Hirotaka Ori

Shogo Shirakawa

Takeshi Nobukawa

Shunsuke Oishi

Takahiro Nagata

Norimichi Shimano

Minoru Itou

A supported catalyst particles include oxide carrier particles and noble metal particles supported on the oxide carrier particles, wherein the mass of the noble metal particles is less than or equal to 5 mass % based on the mass of the oxide carrier particles, and the average particle size of the noble metal particles measured by transmission electron microscopy is 1.0-2.0 nm, with the standard deviation σ less than or equal to 0.8 nm.

Supported catalyst particles

An exhaust gas purification catalyst including an alkaline-earth metal carried on a porous carrier in a highly dispersed state. The catalyst layer of the exhaust gas purification catalyst has an alkaline-earth metal carrying region including a porous carrier, Pt, and a sulfuric acid salt of at least one alkaline-earth metal carried on the porous carrier, wherein a value of Ris 0.5 or more, where Rrepresents the Pearson's correlation coefficient calculated using &#x3b1; and &#x3b2; in each pixel obtained by, for a cross section of the region, performing the area analysis by FE-EPMA under the conditions of: pixel size 0.34 &#x3bc;m&#xd7;0.34 &#x3bc;m; and number of measured pixels 256&#xd7;256; and measuring an intensity (&#x3b1;: cps) of a characteristic X ray of an element (Ae) of the alkaline-earth metal and an intensity (&#x3b2;: cps) of a characteristic X ray of Pt for each pixel.

Exhaust gas purification catalyst

The present invention provides an exhaust gas purification catalyst including an alkaline earth metal supported in a highly dispersed state on a porous carrier. A catalyst layer of the exhaust gas purification catalyst provided by the invention has an alkaline earth metal-supporting region including a porous carrier, a catalyst metal belonging to the platinum group, and a sulfate of at least one type of alkali earth metal supported on the porous carrier. In a cross-section of this region, a Pearson correlation coefficient Ris at least 0.5 as calculated using &#x3b1; and &#x3b2; for each pixel obtained by carrying out area analysis by FE-EPMA under conditions of pixel size of 0.34 &#x3bc;m&#xd7;0.34 &#x3bc;m, and measured pixel number 256&#xd7;256, and by measuring the characteristic X-ray intensity (&#x3b1;:cps) of the alkaline earth metal element (Ae) and the characteristic X-ray intensity (&#x3b2;:cps) of the main constituent element of the inorganic compound constituting the porous carrier for each pixel.

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Kakegawa, Japan

Shogo Kawamura