Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kabushiki Kaisha

Kyushu University

Norihiko Suzuki

Yuichi Matsuo

Atsushi Furukawa

Kazunori Kiguchi

Takeshi Mori

Masahiro Sakanushi

Tomohiro Nishi

Shinichi Kikuchi

Hiroshi Oono

Yoshiaki Matsuzono

Ryoko Yamada

Keita Ishizaki

Kenji Katayama

Hiroki Hosoe

Hideki Uedahira

Kei Kuroki

An exhaust emission control device includes a catalytic converter arranged in an exhaust passage of the internal combustion engine. The catalytic converter includes an upstream catalytic converter and a downstream catalytic converter arranged on a downstream side of the upstream catalytic converter. The upstream catalytic converter includes a first support and a first catalyst supported on the first support. The first catalyst includes a first lower layer catalyst and a first upper layer catalyst. Pd in the first lower layer catalyst is supported only on the oxygen storage component contained in the first catalyst. The first upper layer catalyst is provided on the first lower layer catalyst, Pd in the first upper layer catalyst being supported on each of the oxygen storage component and AlOcontained in the first catalyst.

Exhaust emission control device for internal combustion engine

This invention provides an exhaust gas purification catalyst, which can burn PM (particulate matter) at a temperature below the temperature required in the prior art technique and can realize a high PM combustion rate at elevated temperatures, and an exhaust gas purification apparatus using the exhaust gas purification catalyst. The exhaust gas purification catalyst comprises a composite oxide having oxygen release properties and Ag and a noble metal co-supported on the composite oxide. The exhaust gas purification catalyst and an exhaust gas purification apparatus () using the exhaust gas purification catalyst can increase the PM combustion rate at elevated temperatures and, at the same time, can burn PM at a temperature below the temperature required in the prior art technique. Further, fuel consumption loss caused by forced regeneration, EM deterioration, and catalyst deterioration can be suppressed, and, thus, the load on automobiles can be reduced.

Exhaust gas purification catalyst and exhaust gas purification apparatus using the exhaust gas purification catalyst

An exhaust gas cleaner which can attain an improvement in the efficiency of particulate filter regeneration and has excellent durability. The exhaust gas cleaner, which purifies an exhaust gas discharged from an internal combustion engine, comprises: a gas channel through which the exhaust gas flows; and a DPF () disposed in the gas channel and having many pores. The DPF () has an introduction surface () which comes into contact with the exhaust gas, the surface () having been almost wholly coated with a microporous material () having micropores with a smaller pore diameter than the pores. This microporous material () comprises a support made of an oxygen-storing/releasing oxide having one or more elements selected from the group consisting of alkaline earth metal elements, transition metal elements, Group-12 elements, and Group-13 elements and a silver-containing catalyst deposited on the support.

Exhaust gas cleaner

An exhaust gas purifying apparatus is provided for efficiently purifying particulate matter discharged from an internal combustion engine at a lower exhaust gas temperature by adequately disposing of the absorbent material for absorbing hydrocarbon, the combustion catalyst for hydrocarbon, and the combustion catalyst for particulate matter. The exhaust gas purifying apparatus disposed in an exhaust gas path of the internal combustion engine for purifying particulate matter in exhaust gas discharged from the internal combustion engine, includes a particulate filter, wherein the particulate filter has a porous wall; a first layer formed on a surface of the porous wall, including an absorbent material for absorbing hydrocarbon contained in exhaust gas; and a second layer formed on a surface of the first layer, containing a combustion catalyst for the particulate matter and a combustion catalyst for the hydrocarbon.

Exhaust gas purifying apparatus

A catalyst for exhaust gas purification is provided that can not only efficiently and simultaneously purify nitrogen oxides, hydrocarbons and carbon monoxide in exhaust gas emitted from internal combustion engines such as those of automobiles even at lower temperatures, but also exhibits higher durability. The coexistence of a complex oxide that includes a rare earth element and palladium, a rare earth oxide, and a perovskite-type complex oxide that is expressed by the general formula LnAlO, in which Ln is a rare earth element, may provide a catalyst that not only efficiently purifies the exhaust gas emitted from internal combustion engines such as those of automobiles even at lower temperatures, but also exhibits higher durability.

Catalyst for exhaust gas purification and exhaust gas purification apparatus

A purification catalyst for exhaust gas enhances the activities of the precious metals, preventing drop of activities at high temperature, and exhibiting a sufficient performance even during low temperature (below 400&#xb0; C.) operation when starting a vehicle or during idling. The Pd oxide is supported on the Al oxide, and the Al oxide is LnAlO(Ln: rare-earth element).

Catalyst for clarifying exhaust gas and method for preparation thereof, and exhaust gas clarification catalyst device for vehicle

An exhaust gas purifying catalyst which exhibits sufficient efficiency during low temperature operation (below 400&#xb0; C.) such as starting of a vehicle or idling operation can be provided by improving activation of a noble metal itself and preventing reduction of activation at high temperatures. In the catalyst, Pd is supported on a complex oxide having the ratio formula of LnXAlZO(Ln: rare earth element, X: alkali earth metal, Z: 2 to 5 group or 12 to 14 group element, 0.02&#x2266;a&#x2266;0.30, 0.02&#x2266;b&#x2266;0.30).

Exhaust gas purifying catalyst and exhaust gas purifying device therewith for vehicle

A purification catalyst for exhaust gas which exhibits satisfactory performance even at a low temperature operation of starting or idling of engine (not more than 400&#xb0; C.), and a production method therefore are provided. The catalyst comprises an aluminum oxide supporting Pd, and the aluminum oxide is LnAlO(Ln: rare-earth metal).

Purification catalyst for exhaust gas, production method therefor, and purification catalyst equipment for exhaust gas

A purification catalyst for exhaust gas enhances the activities of the precious metals, preventing decrease of activities at high temperature, and exhibiting a satisfactory performance during operation. In the purification catalyst of the present invention, Pd is supported by an aluminum composite oxide having a perovskite structure, the aluminum composite oxide is LnAlMOin which Ln is a rare-earth element, and the element M in the LnAlMOis one of elements in groups 1 to 5 and groups 12 to 14.

Purification catalyst for exhaust gas, production method therefor, and purification catalyst device for automobile exhaust gas

A purification catalyst for exhaust gas enhances the activity for each precious metal by effectively utilizing the precious metal without incurring a high production cost, thereby improving endurance. The purification catalyst for exhaust gas comprises a composite oxide supporting Pd, the composite oxide has a rational formula MXOin which M is an alkali metal element and X is an element in group 5 in periodic table, and a perovskite crystal structure.

Purification catalyst for exhaust gas

Pd-based composite oxide containing at least one element selected from rare earth metals is used. Therefore, a composite oxide having the same amount of noble metal as in a conventional technique can be burned at a lower temperature. As a result, a purification catalyst for exhaust gas having superior purification properties in which deterioration of Pd dispersion by crystallization is prevented, and a production method therefor can be provided.

Purification catalyst for exhaust gas, production method therefor, and purification catalyst device for exhaust gas

An exhaust emission control system for an internal combustion engine is provided. The exhaust emission control system () includes a monolith catalyst (MC) that includes an oxygen storage agent and a noble metal-based three-way catalyst including Pd, Rh, and Pt disposed at an upstream location in the exhaust gas flow in the internal combustion engine (), and a perovskite-type double oxide having a three-way catalytic function disposed at a downstream location in the exhaust gas flow. The amount C1 of Pd carried is 0.97 g/L&#x2266;C1&#x2266;1.68 g/L, the amount C2 of Rh carried is 0.11 g/L&#x2266;C2&#x2266;0.2 g/L, the amount C3 of Pt carried is 0.06 g/L&#x2266;C3&#x2266;0.11 g/L, the amount C4 of the oxygen storage agent carried is 25 g/L&#x2266;C4&#x2266;75 g/L, and the amount C5 of the perovskite-type double oxide carried is 5 g/L&#x2266;C5&#x2266;15 g/L. It is thereby possible to provide an exhaust emission control system that can reduce the production cost by reducing the amount of noble metal-based three-way catalyst used and at the same time can maintain a high exhaust emission control rate.

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Wako, Japan

Norihiko Suzuki