Nippondenso Co., Ltd.

Denso Corporation

Nippon Soken, Inc.

Other

Toyota Jidosha Kabushiki Kaisha

Keiji Ito

Yasuyuki Kawabe

Naoto Miwa

Tomohiko Nakanishi

Masakazu Tanaka

Masanori Yamada

Masanori Fukutani

Kazuyuki Ito

Kiyotaka Matuo

Takashi Obata

Masao Yokoi

Kazuma Matsui

Kouji Yoshizaki

Tohru Yoshinaga

Yukikatsu Ozaki

Kiyohiko Watanabe

Kouhei Igarashi

Mitsuhiko Masegi

Mamoru Nishimura

Yukihiro Shinohara

Hiroshi Hirayama

Masakazu Murata

Yosiyasu Andou

Kazuo Oyobe

Takatoshi Shinyoshi

Etsuji Nomura

Tosiharu Kondo

Masanori Yamato

Takumi Suzawa

Osamu Fujishiro

Takeshi Ueda

Takasi Obata

Yasushi Shimizu

Ichiro Hashimoto

Kiyotaka Matsuo

Takahiro Kida

Yoshiyasu Andou

Tosiharu Konda

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

The present invention provides a ceramic honeycomb structural body, and method for preparing the same, which can satisfactorily support a catalyst and can demonstrate superior mechanical strength, even if far thinner walls are used. Said structural body comprises lattice walls formed by a large number of cells which are channels for fluid and a peripheral wall which covers at least the circumference of said lattice walls . The outer peripheral portion of said lattice walls located in the vicinity of said peripheral wall (area B) contain a densified portion of smaller porosity than that of an inner peripheral portion , of said lattice walls , which is located inside said outer peripheral portion (area A).

Ceramic honeycomb structural body and methods of preparing the same

There is provided a honeycomb structural body with a high cell density of 600 cells/in or greater and excellent catalyst loading properties. In a honeycomb structural body comprising a plurality of cells formed by providing partition walls composed mainly of cordierite, which has the chemical composition SiO : 45-55 wt %, Al O : 33-42%, MgO: 12-18 wt %, in a honeycomb fashion, the density of the cells is at least 600 cells/in and the pore volume of the partition walls is at least 30%.

Honeycomb structural body

A purification catalyst for exhaust gas is provided that uses a hexagonal cell monolithic carrier which is able to demonstrate purification performance that is superior to the case of using a square cell monolithic carrier. This purification catalyst for exhaust gas comprises a monolithic carrier ( ) provided with hexagonal cells ( ) of 200 cells/in or more in which the porosity of partition walls ( ) that form the cells ( ) is 25% or more; and, a catalyst layer ( ) arranged on the surface of the partition walls ( ) of the monolithic carrier ( ) that contains a catalyst component for purification of exhaust gas. The thickness of catalyst layer ( ) is 10-70 &mgr;m at its thin portion ( ), and its thick portion ( ) has a thickness of no more than 12 times that of thin portion ( ).

Purification catalyst for internal combustion engine exhaust gas

A ceramic honeycomb structural body, and method for preparing the same, which can satisfactorily support a catalyst and can demonstrate superior mechanical strength, even if far thinner walls are used. The structural body comprises lattice walls formed by a large number of cells which are channels for a fluid and a peripheral wall which covers at least the circumference of the lattice walls. The outer peripheral portion of the lattice walls located in the vicinity of the peripheral wall (area B) contains a densified portion of smaller porosity than that of an inner peripheral portion, of the lattice walls, which is located inside the outer peripheral portion (area A).

There is provided a honeycomb structural body with a lower-than-conventional heat capacity and excellent durability. A honeycomb structural body (,) having partition walls composed mainly of cordierite arranged in a honeycomb fashion is provided with fortified section (,) with a higher strength than the general section (,) at one end or both ends (,) in the direction of length of the partition walls (,). The fortified section (,) is given improved strength by having increased density with respect to the general section.

Honeycomb structural body and process for production of the same

A passenger protection system for a motor vehicle having a supplementary power supply for operating the protection system has a relatively small capacity. This enables the system to be made more compact and lighter. The vehicle includes a battery disposed in parallel with two diodes via a key switch. Output form one diode charges a back-up condenser. Discharge energy from the back-up condenser is provided to the airbag circuit via a switch. The output of the other diode is also provided to the airbag circuit. The switch is controlled by a detection circuit that judges whether energy is supplied from the back-up condenser to the airbag circuit. An ignition device is set so that the airbag may be operated via a switch which is turned on with deceleration so that the power is provided responsive to a collision determination.

Vehicular passenger protection system

An electrical heating type catalytic device having a metallic catalyst carrier constituted by layering metallic foils, surfaces of the metallic foils being coated by an insulation film, adjoining metallic foils being joined conductively in only some regions of the metallic catalyst carrier.

Electrical heating type catalytic device

A metal catalyst carrier for exhaust gas purification, comprising: a metal honeycomb column composed of flat and wavy metal sheets laminated, wound together, and bonded to each other to provide numerous exhaust gas flow paths along the column axis, the honeycomb column having a quasi-elliptical cross section defined by a pair of mutually facing linear portions and a pair of mutually facing curved portions in a plane perpendicular to the column axis, the flat and wavy sheets being bonded in a greater bond rate in the major axial end portions than in the other portion of the quasi-ellipse, the bond rate being defined as a quotient obtained by dividing a bonded length by a total length of lines on which the laminated and wound flat and wavy sheets are in contact with each other; and a columnar metal case fittingly enclosing the honeycomb column and bonded to the honeycomb column only in the portions corresponding to the curved portions of the quasi-elliptical cross section.

Metal catalyst carrier

To improve the strength of the laser weld bond between an inner honeycomb column and an outer metal case, a metal honeycomb assembly comprises a metal honeycomb column composed of a flat metal sheet and a wavy metal sheet which are mutually laminated and spirally wound together, the metal honeycomb column having an outermost circumferential portion in the form of a composite wavy sheet composed of a plurality of superposed layers of the wavy metal sheet; and a metal case fittingly enclosing the metal honeycomb column, the metal case and the metal honeycomb column being bonded together by laser-welding the wave peaks of the composite wavy sheet to an inner wall of the metal case.

Metal assembly

Multi-point welding method and catalyst support produced thereby

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

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Nagoya, Japan

Keiji Ito