Cataler Corporation

Yu Sakurada

Satoshi Matsueda

Ryota Nakashima

Sho Hoshino

Chihiro Kasuya

Takahiro Harada

Koki Yanagawa

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

A novel exhaust gas purifying catalyst, method for producing same, and an exhaust gas purification device using same, which are capable of maintaining catalytic activity of a precious metal at a higher level than compared with conventional exhaust gas purifying catalysts. An exhaust gas purifying catalyst having a first carrier particle, a second carrier particle, and a precious metal catalyst particle carried on the first and second carrier particles, wherein: the first carrier particle contains a rare-earth oxide other than ceria and at least one metal oxide selected from the group consisting of silica, alumina, ceria, zirconia, and titania; the second carrier particle contains a rare-earth oxide other than ceria; and the contained amount of the rare-earth oxide in the second carrier particle is higher than the contained amount of the rare-earth oxide in the first carrier particle.

Exhaust gas purifying catalyst and method for producing same, and exhaust gas purification device using same

An exhaust gas purification catalyst, characterized by having a catalyst layer containing palladium, rhodium, and alumina, which supports a sulfate of an alkaline-earth metal selected from barium sulfate and strontium sulfate, and the correlation coefficients &#x3c1;and &#x3c1;calculated from the characteristic X-ray intensity measured using an electron beam micro-analyzer for the palladium, rhodium, and alkaline-earth metal being +0.75 to +1.00 and 0.00 to +0.25, respectively, using 350 points as measurement points obtained by equally dividing the catalyst layer into 351 parts in the thickness direction on a virtual straight line that runs through the catalyst layer in the thickness direction.

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Kakegawa, Japan

Yu Sakurada