Nippondenso Co., Ltd.

Denso Corporation

Kabushiki Kaisha Toyota Chuo Kenkyusho

Kazuyuki Ito

Naoto Miwa

Yukihisa Takeuchi

Hitoshi Yoshida

Yasunao Miura

Keiji Ito

Masanori Fukutani

Kazuma Matsui

Osami Kamigaito

Haruo Doi

Masami Ouki

Akira Takeuchi

Yosiyasu Andou

Etsuji Nomura

Kazuo Oyobe

Yoshiharu Hirose

Ceramic honeycomb structure and method of production thereof

A catalytic structure for cleaning exhaust gas from automobiles, etc., is provided. The catalytic structure comprises a ceramic carrier having a three-dimensional network skeleton forming the intercommunicating voids therein and a catalyst-carried activated alumina layer formed on the surface of the three-dimensional network skeleton. This catalytic structure is produced by contacting a ceramic carrier with a catalyst-containing solution and drying the carrier by evaporating the solvent in the solution so that the catalyst will be carried at a higher density in the activated alumina layer on the side of the skeleton surface against which side the incoming exhaust gas does not impinge, than on the side against which the exhaust gas impinges.

Catalytic structure for cleaning exhaust gas

A porous ceramic body is prepared by dipping an organic foam having a three-dimensional network structure in a ceramic slurry to deposit a sufficient amount of the ceramic on the surface of the foam, moving an excess of the ceramic slurry contained in the foam to the intended peripheral region of the foam by exerting centrifugal force on the foam, thereby causing denser ceramic deposition in the peripheral region than in the other region of the foam, and then drying, solidifying, and baking to burn out and dissipate the foam and simultaneously sinter the ceramics.

Process for producing porous ceramic bosy

An exhaust gas purifying filter having a multiplicity of inward being open at the one axial end and blocked at the other axial end, a multiplicity of outward passages parallel to the axis of the filter, the outward passages being open at one axial end and blocked at the other axial end, and having porous partition walls placed between the inward passages and the outward passages and separating the inward passages and the outward passages from one another, which is characterized in that the surface of the partition wall exposed to at least the inward passage has superficial pores communicating with internal pores in the partition wall, the superficial pores being composed of small pores having a diameter of 5 to 40 .mu.m and large pores having a diameter of 40 to 100 .mu.m, the number of the small pores being 5 to 40 times that of said large pores and production of the same.

Exhaust gas purifying filter and production of the same

Filter apparatus having a honeycomb structure and a heater for purifying exhaust gases consists of cells or passages defined by porous partition walls. Alternate passages are provided respectively with upstream plugs and downstream plugs. Particulates in exhaust gases are trapped in the honeycomb structure and ignited by the heater. The upstream plugs define spaces upstream thereof in which particulates are trapped in addition to those trapped in the passages having downstream plugs. The heat of burning of the particulates trapped in the spaces facilitates the burning of the particulates trapped in the passages having downstream plugs. Therefore, the exhaust gas particulates trapped and collected in the downstream portion of the structure can also be easily burned to regenerate the structure over its entire length.

Fitter apparatus for purifying exhaust gases

A process for producing a cordierite ceramic product comprises blending a starting cordierite composition which comprises:

Process for producing cordierite ceramic products

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Nishio, Japan

Kazuyuki Ito