Toyota Jidosha Kabushiki Kaisha

Nippon Steel Corporation

Nippon Soken, Inc.

Toyota Chuo Kenkyusho Kabushiki Kaisha

Masahiko Ogai

Kouji Yoshizaki

Kazuhiro Sakurai

Tetsuo Nagami

Toshihiko Igashira

Takaaki Itou

Tohru Yoshinaga

Kiyohiko Watanabe

Toshihiro Takada

Masakatsu Sanada

Yasuyuki Kawabe

Hiroshi Hirayama

Yukihiro Shinohara

Akihiro Izawa

Osamu Fujishiro

Takuzou Kako

Hiroaki Ichikawa

Takashi Ohta

Yoshiaki Fukushima

Akane Okada

Shinji Inagaki

Kenichi Harada

Yasuo Takada

Kazuyuki Kuroda

Shogo Konya

Yuji Sakakibara

Kazuhiro Fukumoto

Yoshitsugu Ogura

Yuuji Nakashima

Shinji Matsuura

Kouki Yotsuya

Kouji Banno

Kenichi Hirada

Keiji Sato

Shohgo Konya

Kazunori Itoh

Kenji Fujino

Yuuji Nakajima

Yukimura Yamada

Kiyotaka Hayashi

In an exhaust gas purifying catalyst, a catalyst supporting layer is formed on a surface of a cell wall of a honeycomb base member, and a catalytic noble metal and a NOx adsorbing material are loaded on the catalyst supporting layer. The portion of the catalyst supporting layer present within a depth of 100 .mu.m constitutes at least 80% by volume relative to a total volume of the catalyst supporting layer. The catalyst maintains a high probability of contact of emissions with the NOx adsorber and the catalytic noble metal, and allows easy decomposition of the sulfuric acid salt produced by sulfur poising of the NOx adsorber, thereby ensuring reliable recovery of the NOx purifying performance.

Exhaust gas purifying catalyst

Device for purifying exhaust gas of internal combustion engine

An electrically heating catalytic apparatus that quickly heats catalyst to an activation temperature even when the engine is started at a low temperature below the catalyst activation temperature. The apparatus employs an electrically conductive catalyst carrier that is electrically heated. The carrier is provided with local hot spots to be energized. Since the heat is locally generated, the heat capacity of the catalyst carrier is small to shorten a temperature increasing time.

Electrically heated catalytic apparatus

The electrically heated catalytic converter of the present invention includes a catalyst substrate, which is formed as a scroll-like cylindrical laminated assembly. The assembly is formed by laminating a thin corrugated and plain metal sheets and winding the metal sheets together around a center electrode. The outermost layer of the laminated assembly is connected to an outer electrode. The corrugated metal sheet has an insulating coating made of an alumina, and the plain metal sheet is uninsulated. Local conductive connections form between the thin metal sheets by soldering strips of zirconium solder foils between the layers of the thin metal sheets. Since zirconium has a larger reducing capability than aluminum, the alumina in the insulating coating is reduced by zirconium and precipitates at the local conductive connections. Therefore, the plain and corrugated metal sheet are electrically connected to each other at the local conductive connections. The solder foils in the respective layers are arranged in a configuration where a strip of solder foil in one layer overlaps with strips of solder foils in adjoining layers only at its ends, and does not overlap with strips of solder foils in the adjacent layers when viewed radially. Since the solder foils overlap only by a small area, electric current flowing through the local conductive connections concentrates in the overlap area and produces hot spots. The overall resistance of the electric paths can be adjusted by varying the solder strip length.

Electrically heated catalytic converter for an engine

An exhaust gas purifying catalyst is characterized in that at least one kind of catalyst metal is loaded on a layered porous silica or a layered porous silica-metal oxide. The exhaust gas purifying catalyst is used as an oxidation catalyst for purifying hydrocarbon and carbon monoxide, or a reduction catalyst for purifying nitrogen oxides (NO.sub.x), which is suitable for purifying exhaust gases in automobiles. An exhaust gas purifying apparatus includes the above exhaust gas purifying catalyst and an absorbent for trapping hydrocarbon components, in which aromatic HC such as trimethylbenzene and the like are effectively trapped.

Growing community of inventors

Toyota, Japan

Masahiko Ogai