Toyota Jidosha Kabushiki Kaisha

Nagoya University

501 Toyota Jidosha Kabushiki Kaisha

Takashi Minami

Satoshi Nagao

Shinichi Matsumoto

Hirohito Hirata

Fumiyoshi Noda

Yoshihiro Kanome

Masakuni Ozawa

Yutaka Yamada

Toshimi Nagase

Etsuo Sugiyama

A production method comprising: adding a hydroxycarboxylic acid to an aqueous solution containing a Ce salt, a Zr salt, an Al salt, and at least one selected from a La salt, an Mg salt, and a Ca salt, to produce a gel, heating the gel to obtain a solid product by decomposition of the salts, firing the solid product to obtain a fired product containing a ceria-zirconia-based regular array phase precursor and an aluminate-based composite oxide precursor, performing a reducing heat treatment of the fired product to obtain a first composite having mutually dispersed therein a pyrochlore phase and an aluminate-based composite oxide, and performing an oxidizing heat treatment of the first composite to obtain a second composite in which at least part of the pyrochlore phase is transformed into a &#x3ba; phase; and an oxygen storage material having mutually dispersed therein the composite oxide and the regular array phase.

Production method of oxygen storage material

A satisfactory oxygen storage material and a method for producing it are provided. The oxygen storage material comprises zirconia particles with a ceria-zirconia complex oxide supported on the zirconia particles. The ceria-zirconia complex oxide includes a pyrochlore phase and has a mean crystallite diameter of 10 nm to 22.9 nm.

Ceria-zirconia complex oxide material and method for producing same

An exhaust gas purification device for purifying exhaust gas of an engine, having an absorbent trapper absorptive of hydrocarbons in the exhaust gas up to a first gas temperature such as 200.degree. C. while releasing the absorbed hydrocarbons in the exhaust gas above a second gas temperature such as 400.degree. C., and a passage system responsive to the gas temperature for conducting the exhaust gas from the engine to pass through the absorbent trapper until the gas temperature rises up to the first gas temperate, to bypass the absorbent trapper when the gas temperature exceeds the first gas temperature, and to pass through the absorbent trapper and the catalytic converter in this order when the gas temperature exceeds the second gas temperature.

Exhaust gas purification device in variable combination of absorbent and

An exhaust gas purifying apparatus employing a 3-way catalyst has either a Y-type zeolite or a mordenite as an adsorbent for adsorbing a harmful component in exhaust gas which is disposed at the upstream side of the catalytic converter so that, when the exhaust gas temeprature is not higher than a specific temperature, a harmful component is adsorbed by means of the adsorbent, whereas, when the exhaust gas temperature exceeds the specific temperature, the harmful component desorbed from the adsorbent is introduced into the catalytic converter. Further, an activated carbon trapper and a by-pass are provided in parallel at the upstream side of the adsorbent so that the flow paths of exhaust gas are selectively switched from one to the other in accordance with the level of the exhaust gas temperature.

Exhaust gas purifying apparatus for automobile

A fuel vapor collecting device comprising an activated carbon receiving chamber filled with activated carbon particles. Each of the activated carbon particles contains heat accumulating solid fillers which are uniformly distributed therein. The heat accumulating solid fillers are made of a metallic material having a specific heat which is larger than that of the activated carbon.

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Toyota, Japan

Takashi Minami