Johnson Matthey Public Limited Company

Johnson Matthey (Shanghai) Chemicals Limited

Nippon Denko Co., Ltd

Takashi Yamada

Shuhei Nagaoka

Hai-Ying Chen

Satoshi Sumiya

Dongsheng Qiao

Hongyu Ji

Xiang Zheng

Eric Tyo

Tomoharu Itoh

Tomotaka Hirota

Yasunori Kurashima

Yukie Ohtsuka

Takayuki Suzuki

Keigo Aihara

Hirofumi Konno

A three-way catalyst article, and its use in an exhaust system for internal combustion engines, is disclosed. The catalyst article for treating exhaust gas comprising: a substrate comprising an inlet end and an outlet end with an axial length L; a first catalytic region comprising a first platinum group metal (PGM) component and a first oxygen storage capacity (OSC) material, wherein the first OSC material has a fresh specific surface area (SSA) of at least 10 m/g; and wherein the first OSC material has an SSA difference of no more than 30 m/g between the fresh first OSC material and the aged first OSC material.

Twc catalysts for gasoline engine exhaust gas treatments

The problem to be solved by the present invention is to provide an oxygen storage and release material comprising a ceria-zirconia-based complex oxide improved in ability to remove HC and NOx and a three-way catalyst able to reduce an amount of NOx emission. Further, to solve this problem, an oxygen storage and release material comprising a ceria-zirconia-based complex oxide containing GdOin 0.1 mol % or more and less than 20 mol % and having an ion conductivity of 2&#xd7;10S/cm or more at 400&#xb0; C. is provided. Further, in addition to the above, an oxygen storage and release material having a molar ratio of cerium and zirconium of 0.2 or more and 0.6 or less by cerium/(cerium+zirconium) and an speed of oxygen storage and release '&#x394;t' of 20.0 seconds or more or amount of oxygen storage and release of 300 &#x3bc;mol-O/g or more etc. was obtained. Further, by applying the oxygen storage and release material to the catalyst, it is possible to assist the purification of exhaust gas as it changes every instant in accordance with the driving conditions and possible to obtain a catalyst with a higher ability to remove harmful components of catalytic precious metals than before. In particular, it is possible to obtain an automotive exhaust gas purification system excellent in ability to remove CO, NOx, and HC.

Oxygen storage and release material, catalyst, exhaust gas purification system, and exhaust gas treatment method

A three-way catalyst article, and its use in an exhaust system for internal combustion engines, is disclosed. The catalyst article for treating exhaust gas comprises: a substrate; and a catalytic region on the substrate; wherein the catalytic region comprises a platinum group metal (PGM) component, an oxide, and a rare earth metal component; wherein the oxide is an inorganic oxide, an oxygen storage component (OSC) material, or a mixture thereof; wherein the rare earth metal component concentration by element on the surface of the oxide per unit specific surface area of the oxide is 1 &#x3bc;mol/mto 20 &#x3bc;mol/m.

Exhaust gas purification catalyst

Growing community of inventors

Tochigi, Japan

Takashi Yamada