Toyota Jidosha Kabushiki Kaisha

Cataler Corporation

Takeshi Hirabayashi

Koji Sugiura

Takaya Ota

Masatoshi Ikebe

Keisuke Murawaki

Kohei Takasaki

Takeshi Morishima

Akemi Satou

Masahide Miura

Hiroki Nishijima

Oji Kuno

Akemi Sato

Makoto Tsuji

Hiroto Imai

Shintaro Kobayashi

Fumitaka Kato

An exhaust gas purification device suppresses a pressure loss increase and includes a honeycomb substrate and inflow cell side catalyst layer. The substrate includes a porous partition wall defining several cells extending from an inflow side end surface to an outflow side end surface. The cells include an inflow and outflow cell adjacent across the wall. The inflow cell has an open inflow side end and sealed outflow side end. The outflow cell has a sealed inflow side end and open outflow side end. The catalyst layer is on an inflow cell side surface in an region extending from the inflow side end positioned 10% or more of the partition wall length. At this position, a filled portion of the inflow cell side catalyst layer pores are 40% or less. The pores are present to a depth of 50% of a thickness of the partition wall.

Exhaust gas purification device

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.

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.

The present invention provides an exhaust gas purification catalyst provided with: a substrate of wall flow structure in which inlet cells and outlet cells are partitioned by porous partition walls; and a catalyst layer disposed at least inside the partition wall and including a catalyst body. The catalyst layer satisfies the following conditions: (1) the pore volume of pores no larger than 5 &#x3bc;m, as measured in accordance with a mercury intrusion technique, is 24000 mmor greater per L of volume of the substrate; and (2) a permeability coefficient measured by a Perm porometer is 0.6 &#x3bc;mto 4.4 &#x3bc;m.

Exhaust gas purification catalyst

A method of correcting NOsensor includes the steps of preparing a corrective map in advance, finding an existing proportion of NO or NOin a mixture of NOin exhaust gases before coming into an NOsensor, and correcting an NOconcentration that the NOsensor detects actually. The corrective map records relationships between temperature physical quantities that are relevant to a temperature of the exhaust gases, oxygen-concentration physical quantities that are relevant to an oxygen concentration in the exhaust gases, and the existing proportion. The existing proportion is found with reference to the corrective map using the temperature physical quantities and oxygen-concentration physical quantities that are detected actually. The NOconcentration is corrected on the basis of not only the existing proportion but also a difference between an NOdiffusion velocity and an NO diffusion velocity.

[object Object]

In order to provide an exhaust gas purifying catalyst having improved heat resistance and OSC, a metal oxide particle, and a production process of the metal oxide particle, a metal oxide particle having a core () where the total molar number of alumina and silica is larger than the molar number of ceria, and a surface layer () where the molar number of ceria is larger than the total molar number of alumina and silica is provided. Further, an exhaust gas purifying catalyst comprising the metal oxide particle and a noble metal supported on the metal oxide particle; and a production process of the metal oxide particle are provided.

Exhaust gas purifying catalyst, metal oxide particle and production process thereof

Monolith catalyst is disposed in the reaction layer of reformer , the monolith catalyst carrying a copper-zinc catalyst which accelerates a water vapor reforming reaction and an oxidation reaction of methanol on a monolith carrier with a ratio of the length to the diameter between 5 and 18, more preferably 8 and 15, 600 to 3400 cells per square inch, more preferably 900 to 3000 cells per square inch, and formed from ceramics of low thermal conductivity at the region within 15 mm from the flow-in end of the mixture gas and from a metal of high thermal conductivity at the other portions. As a result, the degree of freedom of design and the efficiency of the water vapor reforming reaction can both be improved.

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Toyota, Japan

Takeshi Hirabayashi