Toyota Jidosha Kabushiki Kaisha

Cataler Corporation

Souta Akiyama

Masahide Miura

Isao Chinzei

Shogo Shirakawa

Mitsuyoshi Okada

Seiji Nakahigashi

Isao Naito

Hiroki Nihashi

Takashi Onozuka

Takahiro Nishio

Norimichi Shimano

Hiromi Togashi

Hiromasa Suzuki

Takahiro Noguchi

The present disclosure provides an exhaust gas purification catalyst having an improved Rh activation, which comprises a substrate and a catalyst coat layer formed on the substrate, the catalyst coat layer having a two-layer structure, wherein the catalyst coat layer includes an upstream portion on an upstream side and a downstream portion on a downstream side in an exhaust gas flow direction, and a part or all of the upstream portion is formed on a part of the downstream portion, wherein the upstream portion contains Rh fine particles and Pt, wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation &#x3c3; of the particle size of 0.8 nm or less, and wherein the downstream portion contains Rh.

Exhaust gas purification catalyst

The present disclosure relates to an exhaust gas control catalyst including a base and a catalyst coating layer having a two-layer structure on the base. The catalyst coating layer includes a lower layer on the base, and an upper layer on the lower layer. The upper layer of the catalyst coating layer contains Rh particles in which a mean particle diameter measured by observation using a transmission electron microscope is 1.0 nm or more and 2.0 nm or less and a particle-diameter standard deviation &#x3c3; is 0.8 nm or less. A length of the upper layer from an end face on a downstream side in an exhaust gas flow direction falls within a range of 70% or more and 100% or less of a total length of the base.

Exhaust gas control catalyst

The present disclosure provides an exhaust gas purification catalyst having an improved low-temperature activity, which comprises a substrate and a catalyst coat layer formed on the substrate, wherein the catalyst coat layer contains Rh fine particles and a promoter comprising a Ce&#x2014;Zr-based composite oxide and a Zr-based composite oxide not containing cerium oxide, wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation &#x3c3; of the particle size of 0.8 nm or less, and wherein the Rh fine particles are supported on each of the Ce&#x2014;Zr-based composite oxide and the Zr-based composite oxide not containing cerium oxide.

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Kakegawa, Japan

Souta Akiyama