Honda Motor Co., Ltd.

Mitsui Minings & Melting Co., Ltd.

Tomoko Tsuyama

Takeshi Mori

Takayuki Watanabe

Hiroki Kurihara

Yoshinori Endo

Yusuke Nagai

Shingo Akita

Hideaki Takahashi

Katsuji Wada

Jun Iwamoto

Shinya Ishimaru

Nobuhiro Komatsu

There is provided an exhaust gas purifying catalyst including a substrate and catalyst portions. The substrate includes an inflow-side cells, outflow-side cells, and porous partition walls, each partition wall separating the inflow-side cell from the outflow-side cell. The catalyst portion includes: (group A) first catalyst portions, each first catalyst portion being provided on a surface of the partition wall that faces the inflow-side cell on an upstream side in an exhaust gas flow direction; and (group B) second catalyst portions being provided on a surface of the partition wall that faces the outflow-side cell on a downstream side in the exhaust gas flow direction. Each catalyst portion of one of group A and group B includes at least one oxidizing catalyst layer and at least one reducing catalyst layer, and each catalyst portion of the other of group A and group B includes at least one oxidizing catalyst layer and/or at least one reducing catalyst layer.

Exhaust gas purification catalyst

To provide an exhaust gas purification filter having a high capability of collecting particulate matter. The exhaust gas purification filter includes a filter base material having a wall flow structure and an exhaust gas purification catalyst. A wash coating amount of the exhaust gas purification catalyst ranges from 60 to 110 g/L or less. When the exhaust gas purification filter is divided into an upstream part, a middle part, and a downstream part, and average values of catalyst area ratios of the exhaust gas purification catalyst supported by surfaces of the partition walls are acquired at predetermined locations in cells on an inflow side and cells on an outflow side, a minimum value, among the average values, is 28% or greater. A maximum value, among sizes of pores in the partition walls after the exhaust gas purification catalyst is supported, is 14.6 &#x3bc;m or less.

Exhaust gas purification filter

In an exhaust gas purifying catalyst according to the present invention, a substrate includes inflow-side cells, outflow-side cells, and porous partition walls, each partition wall separating the inflow-side cell from the outflow-side cell. Catalyst portions include: first catalyst portions, each first catalyst portion being provided on a surface of the partition wall that faces the inflow-side cell on an upstream side in an exhaust gas flow direction, and second catalyst portions, each second catalyst portion being provided on a surface of the partition wall that faces the outflow-side cell on a downstream side, and the exhaust gas purifying catalyst satisfies the following expressions: I/I&#xd7;100&#x2265;60%, I/I&#xd7;100&#x2265;60%, I/I&#xd7;100&#x2265;3%, and I/I&#xd7;100&#x2265;3%, where I, I, I, I, and Irepresent pore volumes, definitions of which can be found in the specification.

An exhaust gas purification device for an internal combustion engine, in which a catalyst installed in an exhaust passage is quickly heated to the activation temperature of the catalyst. The exhaust gas purification device has a NOx purification catalyst () for adsorbing or occluding NOx in exhaust gas and reducing the NOx, a catalytic converter () installed at that position of an exhaust pipe () which is upstream of the NOx purification catalyst (), a fuel reformer () installed separately from the exhaust pipe (), producing a reformed gas, and supplying the reformed gas, as a reducing gas, into the exhaust pipe () from an introduction opening () formed in that portion of the exhaust pipe () which is upstream of the NOx purification catalyst () and the catalytic converter (), and an ECU () which, while the exhaust gas air-fuel ratio is being set to be lean, supplies the reducing gas into the exhaust pipe () and controls at least one of a throttle valve (), an EGR valve (), and a turbocharger () to regulate the flow rate of the exhaust gas flowing in the exhaust pipe ().

Exhaust gas purification device for internal combustion engine

Growing community of inventors

Saitama, Japan

Tomoko Tsuyama