Cataler Corporation

Toyota Jidosha Kabushiki Kaisha

Junji Kuriyama

Yasutaka Nomura

Ryota Onoe

Hiroshi Sekine

Yuta Morishita

Naoto Miyoshi

Masahiko Takeuchi

Akemi Sato

Shingo Sakagami

Daisuke Ochiai

Keiichi Narita

Atsushi Tanaka

Ichiro Kitamura

Satoru Inoda

Jun Sawada

Akihito Inoue

An exhaust gas purification device includes: a substrate of wall-flow structure having an inlet cell, an outlet cell and a porous partition wall; an upstream catalyst layer provided inside the partition wall and disposed in an upstream portion, including an exhaust gas inflow end section, of the substrate; and a downstream catalyst layer provided inside the partition wall and disposed in a downstream portion, including an exhaust gas outflow end section, of the substrate. The downstream catalyst layer contains a carrier, and Rh supported on the carrier. The upstream catalyst layer contains a carrier, and Pd and/or Pt supported on the carrier.

Exhaust gas purification device

Provided is an exhaust gas purification catalyst that combines reduction of pressure loss and enhancement of purification performance. This invention provides an exhaust gas purification catalyst comprising a wall-flow-type substrate and first and second catalytic layers. The first catalytic layer is provided to the interior of a partition wall, in contact with an entrance cell, from an exhaust inlet-side end in the running direction, having a length Lless than Lw. The second catalytic layer is provided to the interior of a partition wall, in contact with an exit cell, from an exhaust outlet-side end in the running direction, having a length Lless than Lw. An internal portion of partition wall in contact with entrance cell has a substrate-exposing segment near the exhaust outlet-side end.

Exhaust gas purification catalyst

The exhaust gas purification device includes: a substrate of wall flow structure having inlet cells, outlet cells and a porous partition wall; and a catalyst layer provided in at least part of internal pores of the partition wall and held on the surface of the internal pores. The relationship between an average filling factor A of the catalyst layer held in pores having a pore diameter of 5 &#x3bc;m to less than 10 &#x3bc;m, an average filling factor B of the catalyst layer held in pores having a pore diameter of 10 &#x3bc;m to less than 20 &#x3bc;m and an average filling factor C of the catalyst layer held in pores having a pore diameter of 20 &#x3bc;m to less than 30 &#x3bc;m, among the internal pores of the partition wallin which the catalyst layer is held, satisfies the following expression: A&#x3c;B&#x3c;C.

A wall-flow-type exhaust gas purification catalyst with an oxygen storage material that has an increased OSC and exhibits its OSC without a compromise provides an exhaust gas purification catalyst having a wall-flow-type substrate, a first catalytic layer and a second catalytic layer. The first catalytic layer is provided to an internal portion of a partition wall in contact with an entrance cell. The second catalytic layer is provided to an internal portion of a partition wall in contact with an exit cell. Each of the first and second catalytic layers has an oxygen storage material. The ratio (D/D) of the coating density Dof the first catalytic layer to the coating density Dof the second catalytic layer is 1.1 to 1.8.

An exhaust gas purification catalyst capable of stably maintaining and exhibiting excellent catalytic performance includes a wall-flow-type substrate, a first catalytic layer and a second catalytic layer. The first catalytic layer is provided to an internal portion of a partition wall in contact with an entrance cell. The second catalytic layer is provided to an internal portion of a partition wall in contact with an exit cell. The ratio (D/D) of the coating density Dof the second catalytic layer to the coating density Dof the first catalytic layer is 1.01 to 1.4.

The exhaust gas purification device according to the present invention includes a substrate of wall flow structure having a porous partition wall, and a catalyst layer held in internal pores of the partition wall. The catalyst layer contains, as a carrier, an OSC material having oxygen storage capacity. In the thickness direction of the partition wall, the porosity of the internal pores in inlet regionsis 25% or higher, and an average occupation ratio of the catalyst layer held in the internal pores is 75% or lower.

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Kakegawa, Japan

Junji Kuriyama