Toyota Jidosha Kabushiki Kaisha

Cataler Corporation

Akemi Satou

Koji Sugiura

Takaya Ota

Masatoshi Ikebe

Keisuke Murawaki

Takeshi Hirabayashi

Kohei Takasaki

Takeshi Morishima

Naoki Takahashi

Hiromasa Nishioka

Takahiko Fujiwara

Naoto Miyoshi

Masahiko Takeuchi

Hirotaka Ori

Keizo Hiraku

Tadashi Suzuki

Ryota Nakashima

Yusuke Kawamura

Takahiro Fujiwara

There is provided an exhaust gas purification device that shows a high HC removal performance under a condition in which a rich air-fuel mixture is introduced. The exhaust gas purification device includes a substrate, a first catalyst layer, and a second catalyst layer. The substrate includes an upstream end and a downstream end. The first catalyst layer is disposed on a surface of the partition wall in an upstream region including the upstream end of the substrate. The second catalyst layer is disposed inside the partition wall in a downstream region including the downstream end of the substrate. The first catalyst layer contains a first metal catalyst and alumina-zirconia composite oxide. The second catalyst layer contains a second metal catalyst.

Exhaust gas purification device

The exhaust gas purification device includes a substrate, a first catalyst layer, and a second catalyst layer. The substrate includes an upstream end, a downstream end, and a porous partition wall defining a plurality of cells extending between the upstream end and the downstream end. The plurality of cells include an inlet cell opening at the upstream end and sealed at the downstream end, and an outlet cell adjacent to the inlet cell sealed at the upstream end and opening at the downstream end. The first catalyst layer is disposed on a surface of the partition wall in an upstream region. In a downstream region, the second catalyst layer is disposed inside the partition wall, and a second catalyst-containing wall including the partition wall and the second catalyst layer has a porosity of 35% or more.

An exhaust gas control apparatus includes a honeycomb substrate and an inlet cell-side catalyst layer. The honeycomb substrate includes a porous partition wall that defines a plurality of cells extending from an inlet-side end face to an outlet-side end face. The cells include an inlet cell and an outlet cell that are adjacent to each other with the partition wall therebetween. The inlet cell is open at its inlet-side end and is sealed at its outlet-side end. The outlet cell is sealed at its inlet-side end and is open at its outlet-side end. The inlet cell-side catalyst layer is provided on a surface on the inlet cell side of the partition wall and extends from an inlet-side end of the partition wall. Porosity of the inlet cell-side catalyst layer is in a specific range.

Exhaust gas control apparatus and manufacturing method thereof

An exhaust gas purification catalyst includes: a lower catalyst layer that contains a ceria-zirconia mixed oxide having 50 to 70 mass % of CeOand 5 mass % or more of PrOand carries at least one of Pt and Pd; and an upper catalyst layer that contains at least zirconia and carries at least Rh, wherein the total amount of CeOper liter of the carrier base is 15 to 30 g. Because the amount of CeOis small, formation of HS is suppressed and a high capability of adsorbing and releasing oxygen is brought out in spite of the small amount of CeO.

Exhaust gas purification catalyst

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Toyota, Japan

Akemi Satou