Denso Corporation

Nippon Soken, Inc.

Toyota Jidosha Kabushiki Kaisha

National Institute of Advanced Industrial Science and Technology

Denso Corpora Tion

Takumi Suzawa

Kazuhiko Koike

Tomohiko Nakanishi

Masakazu Tanaka

Tomomi Hase

Miho Ito

Takashi Kondo

Jun Hasegawa

Hiromi Sano

Mikio Ishihara

Keiji Ito

Hideki Kita

Takatoshi Shinyoshi

Tosiharu Kondo

Shuzo Kanzaki

Masanori Yamato

Tatsuki Ohji

Naoki Kondo

Shunkichi Ueno

Jayaseelan Daniel Doni

Yuto Amano

Manabu Ohsuka

An exhaust gas filter for purifying exhaust gases including particulate matter discharged from an internal combustion engine includes a honeycomb structure whose axial direction matches an exhaust gas flow, a plug portion which selectively plugs upstream end faces of the honeycomb structure which faces the exhaust gas flow, and catalyst carried on the honeycomb structure. The honeycomb structure has a plurality of partition walls and cells surrounded by the partition walls, and pores formed inside partition walls between adjacent cells communicating with each other. The plurality of the cells have open cells which are penetrated in the axial direction and plugged cells having one upstream end which face the exhaust gas flow plugged by the plug portion. The honeycomb structure has a first region which does not carry the catalyst on the partition walls and a second region which carries the catalyst on the partition walls.

Exhaust gas filter

The present invention provides a needle-shaped ceramic body and needle-shaped ceramic catalyst body in which a base material is a high specific surface area porous cordierite body that is stable at high temperatures, and also provides methods of producing this needle-shaped ceramic body and needle-shaped ceramic catalyst body. The present invention relates to a needle-shaped ceramic body and needle-shaped ceramic catalyst body in which a base material is a high temperature-stable, high specific surface area porous cordierite body comprising a porous structure having a prescribed porosity and formed of a needle-shaped cordierite crystal phase, and further relates to methods of producing this needle-shaped ceramic body and needle-shaped ceramic catalyst body, and by using porous cordierite constituted of needle-shaped crystals as a catalyst-supporting honeycomb structure, the present invention is able to inhibit sintering-induced reduction in the specific surface area. Since a honeycomb can be directly produced as the cordierite sinter itself, an inexpensive product can be provided through the simplifying the prior-art step of coating the interior of the honeycomb.

Needle-shaped ceramic body, needle-shaped ceramic catalyst body and method for producing same

To improve a CO conversion in stoichiometry-lean atmosphere, and additionally to prevent the rise of pressure loss. A catalytic coating layeris constituted of a lower layerincluding an oxygen storage capacity material and an upper layerbeing formed on a surface of the lower layerand including a catalytic noble metal, and a thickness of the upper layer is adapted so as to be 5 &#x3bc;m-40 &#x3bc;m. The upper layeris good in terms of gas diffusibility, and thereby OSC resulting from the oxygen storage capacity material being included in the lower layeris demonstrated maximally.

Catalyst for purifying exhaust gas

A ceramic body that can support a required amount of catalyst component, without lowering the characteristics such as strength, manufactured without forming a coating layer and providing a high performance ceramic catalyst body that is excellent in practical utility and durability. This ceramic body is made by substituting at least one of the constituent elements of cordierite that constitutes the substrate ceramic, for example Al, with W that is the element having an empty orbit in d or f orbit, has high bonding strength and is less susceptible to deterioration since the catalyst component Pt is supported by means of chemical bonding.

Ceramic body and ceramic catalyst body

This invention provides a method for producing a ceramic catalyst body that can directly support a catalyst on a ceramic support without disposing a coating layer on the ceramic support. In the invention, a catalyst solution containing a catalyst component consisting of a negative complex ion resulting from a catalyst precursor is prepared, and a pH of the catalyst solution is adjusted in such a manner as to satisfy the relation E&#x3e;Eand E&#x3e;0 where Eis a surface potential of a matrix phase consisting of a cordierite-W composite body relative to the pH of the catalyst solution and Eis a surface potential of a dispersed phase consisting of compounds other than the cordierite-W composite body. After the ceramic support is brought into contact with the catalyst solution to support the catalyst component, heat-treatment is conducted to bond the matrix phase consisting of the cordierite-W composite body and the catalyst component to support the catalyst on the ceramic support.

Production method of ceramic catalyst body

This invention aims at achieving early activation by use of a catalytic body having a low thermal capacity, and a low pressure loss, without using a coating layer to reduce exhaust emission. The invention is directed also to improve exhaust purification performance by improving the combination of catalytic bodies and performance of each catalytic body. In the invention, a start catalystis arranged at an upstream portion of an exhaust pipe P of a car engine E and a three way catalystis disposed on the downstream side. The start catalystcan directly support catalytic components through chemical bonds by incorporating replacing elements into a substrate ceramic having high heat resistance such as cordierite. Because a coating layer is not necessary, the catalyst of the invention has a low heat capacity and a large open area and achieves reduction of exhaust emission, and reduction of a pressure loss, through early activation.

Catalyst for automobiles

Growing community of inventors

Okazaki, Japan

Takumi Suzawa