Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Cataler Corporation

Cataler Industrial Co., Ltd.

Tosoh Corporation

Tadashi Suzuki

Hideo Sobukawa

Naoki Takahashi

Toshitaka Tanabe

Koji Yokota

Masahide Miura

Takaaki Kanazawa

Toshio Tanahashi

Shinichi Takeshima

Shinichi Matsumoto

Akira Morikawa

Akihiko Suda

Masakatsu Sanada

Koichi Kasahara

Hiroshi Hirayama

Michihiko Takeuchi

Tetsuhiro Hirao

Syuji Tateishi

Shinichi Matsunaga

Takahiro Suzuki

Toshiaki Tanaka

Hiromasa Suzuki

Satoshi Iguchi

Takahiko Fujiwara

Naoto Miyoshi

Masao Nakano

Isao Chinzei

Mareo Kimura

Masahiko Takeuchi

Masahiro Sugiura

Satoru Katoh

Keizo Hiraku

Satoru Kato

Yoshio Ukyo

Senshi Kasahara

Kiyoshi Yamazaki

Shiroh Kondoh

Kazunobu Ishibashi

Kazushige Igawa

Toshio Kandori

Masayuki Fukui

Atsushi Tanaka

Yasutaka Nagai

Yasuo Ikeda

Yusuke Kawamura

Masanori Yamato

Takahiro Hayashi

Kazuhiko Dohmae

Minoru Itou

Akemi Satou

Kazuaki Sobue

Motohisa Saiki

Katsumi Kamiyama

Tsuneyuki Tanizawa

Masaya Kamada

Tetsuya Shinozaki

Tomoko Iijima

Ichiro Konomi

Takahiro Fujiwara

Hiroyuki Domyo

Tsuneo Higashi

Kazuhiro Yoshimoto

Yuuji Matsuhisa

Itou Minoru

A honeycomb-shaped reaction vessel, comprising:

Honeycomb-shaped reaction vessel

An exhaust gas purification catalyst having a base and a catalytic coating layer formed thereon includes an alumina support, a platinum-group metal, an iron oxide-zirconia-based composite oxide, and a lanthanoid oxide in the same catalytic coating layer.

Exhaust gas purification catalyst for motor vehicle

Provided is an exhaust gas control catalyst including: a substrate (); and a catalyst layer () that is arranged on the substrate, in which the catalyst layer () includes a palladium region () that contains palladium, aluminum oxide, ceria-zirconia solid solution, and a composite oxide of lanthanum, iron, and zirconium, and a rhodium region () that is arranged adjacent to the palladium region along a plane direction of the catalyst layer and contains rhodium, aluminum oxide, and ceria-zirconia solid solution.

Exhaust gas control catalyst

A composite oxide with a high oxygen storage capacity is provided without using cerium. The composite oxide is an iron oxide-zirconia composite oxide containing iron, zirconium, and a rare-earth element. The total content of FeO, ZrO, and an oxide of the rare-earth element is not less than 90 mass %, the content of an iron oxide in terms of FeOis 10 to 90 mass %, and the absolute value of the covariance COV(Fe, Zr+X) of the composite oxide, which has been baked in the atmosphere at a temperature of greater than or equal to 900&#xb0; C. for 5 hours or more, is not greater than 20.

Iron oxide-zirconia composite oxide and method for producing same, and exhaust gas purification catalyst

An exhaust gas-purifying catalyst includes a support provided with one or more through-holes through which exhaust gas flows, and a catalytic layer supported by the support and containing an oxygen storage material. The exhaust gas-purifying catalyst includes a first section to which the exhaust gas is supplied, and a second section to which the exhaust gas having passed through the first section is supplied. The catalytic layer includes a layered structure of a first catalytic layer containing platinum and/or palladium and a second catalytic layer containing rhodium in the first catalytic section and further includes a third layer containing rhodium in the second section. The second section is smaller in oxygen storage material content per unit volumetric capacity than the first section.

Exhaust gas-purifying catalyst

A catalyst for purification of exhaust gas, in which a noble metal is supported on a metal oxide support, has a basic site content of 1 mmol/L-cat or less, as determined on the basis of an amount of COdesorbed per liter of the catalyst as measured by a COtemperature-programmed desorption method.

Catalyst for purification of exhaust gas, and apparatus and method for purification of exhaust gas using the catalyst

An exhaust gas purification catalyst includes: a lower catalyst layer that contains a ceria-zirconia mixed oxide having 50 to 70 mass % of CeOand 5 mass % or more of PrOand carries at least one of Pt and Pd; and an upper catalyst layer that contains at least zirconia and carries at least Rh, wherein the total amount of CeOper liter of the carrier base is 15 to 30 g. Because the amount of CeOis small, formation of HS is suppressed and a high capability of adsorbing and releasing oxygen is brought out in spite of the small amount of CeO.

Exhaust gas purification catalyst

A composite oxide includes CeO, ZrOand a metallic oxide being free from reacting with CeOand ZrOat 700&#xb0; C. or more, preferably at 900&#xb0; C. or more and further preferably at 1,000&#xb0; C. or more. The composite oxide has a regulatory oriented phase, such as a pyrochlore phase, etc., in which at least a part of Ce cations and Zr cations are oriented regularly. The composite oxide makes a catalytic support. The CeO&#x2014;ZrOcomposite oxide and the reaction-free metallic oxide make barriers each other which suppress the granular growth when the composite oxide is subjected to high-temperature heat in a reducing heat treatment to form the regulatory oriented phase. The regulatory oriented phase improves the oxygen storage-and-release capability of the catalytic support. Thus, it is possible to simultaneously attain a large a specific surface area and a high oxygen storage-and-release capability.

Composite oxide, process for producing the same, and exhaust gas reducing co-catalyst

Catalyst for purifying exhaust gas

The composite oxide and the composite oxide carrier are manufactured by the precursor forming step and firing step. The composite oxide catalyst is obtained by preparing a composite of catalytic components simultaneously with the formation of the precursor of composite oxide in the step of forming the precursor of composite oxide. The composite oxide and the composite oxide carrier are composed of a composite oxide in which at least one of cerium and zirconium, and aluminium disperse with extremely high homogeneity. With this structure, the heat resistance of the carrier is improved and consequently, enlargement of particles of the composite oxide defining the carrier, and sintering of adjacent particles of the composite oxide can be restrained, whereby the catalyst using the composite oxide carrier in accordance with the present invention is excellent in heat resistance.

Composite oxide, composite oxide carrier and catalyst

The composite oxide and the composite oxide carrier are manufactured by the precursor forming step and firing step. The precursor forming step includes high speed mixing means. The composite oxide catalyst is obtained by preparing a composite of catalytic components simultaneously with the formation of the precursor of composite oxide in the step of forming the precursor of composite oxide. The composite oxide and the composite oxide carrier are composed of a composite oxide in which at least one of cerium and zirconium, and aluminium disperse with extremely high homogeneity. With this structure, the heat resistance of the carrier is improved and consequently, enlargement of particles of the composite oxide defining the carrier, and sintering of adjacent particles of the composite oxide can be restrained, whereby the catalyst using the composite oxide carrier in accordance with the present invention is excellent in heat resistance. With the present invention, the carrier is not limited to a general catalyst carrier. The carrier may be interpreted to indicate general formed bodies. For example, the carrier with the present invention can be also used as materials for sensors and electrodes, optical materials, semiconductors and structure materials. Furthermore, the carrier can be used for a three-way catalyst, NOx catalyst or oxidation catalyst or a part thereof, and a promoter.

A solid solution particle of oxides contains a solid solution of oxides in which one oxide is dissolved into the other oxide, and in which the degree of dissolution of one oxide into the other oxide is not less 50%, and in which an average diameter of crystallite is not more than 100 nm. The solid solution particle of oxides has small average diameter of a crystallite and large specific surface area, and it improves capacities such as an oxygen storage ability due to high degree of dissolution. A catalyst for purifying exhaust gases has excellent purifying performance by employing the solid solution comprising ceria and zirconia which has large OSC and high oxygen adsorption and discharge speed.

Solid solution particle of oxides, a process for producing the same and

A catalyst for purifying exhaust gases includes a porous support, at least one catalyst ingredient selected from Pt and Pd, and additional ingredients including (1) at least two rare-earth elements including La, (2) at least one rare-earth element including La and at least one transition element selected from Fe, Ni, Co and Mn, (3) at least two alkali metals, (4) at least one alkali metal and at least one rare-earth element including La, (5) at least one alkali metal and at least one transition element selected from Fe, Ni, Co and Mn, (6) at least two alkaline-earth metals, (7) at least one alkaline-earth metal and at least one rare-earth element including La, or (8) Ba, Li, La, Ce and Zr. A process for purifying an exhaust gas, by contacting the catalyst with an exhaust gas, is also provided.

Process for purifying exhaust gases

Method of testing durability of exhaust gas purification device

A device for evaluating catalyst performance deterioration includes an air-fuel ratio sensor and a temperature sensor. The degree of catalyst performance deterioration per unit time is calculated based on the concentration of oxygen in the exhaust gas and the temperature of the catalyst. The deterioration of the catalyst is evaluated on the basis of the accumulated value of the degree of catalyst performance deterioration per unit time.

Device for evaluating catalyst performance deterioration

Growing community of inventors

Seto, Japan

Tadashi Suzuki