N.e. Chemcat Corporation

Daiichi Kigenso Kagaku Kogyo Co., Ltd.

Osaka University

Akira Kohara

Yasuharu Kanno

Yoshiro Hirasawa

Takahiro Wakita

Hiroaki Omoto

Takashi Yamada

Katsuhiro Hirata

Noboru Niguchi

Katsuaki Katoh

Yuki Ohno

Masayuki Katoh

Hajime Ukaji

Teiichirou Chiba

A rotary electric machine includes a rotor that rotates around a rotation axis serving as a center and has a plurality of salient poles protruding in directions perpendicular to the rotation axis, and a stator that includes an annular structural body disposed radially outside the rotor and surrounding the rotor, and 6&#xd7;n windings provided along a circumferential direction of the structural body, a field signal for generating field magnetic flux and a drive signal for driving the rotor as a three-phase rotary electric machine being superimposed on each other to be input to each of the windings. n is a natural number equal to or larger than one.

Rotary electric machine and rotary electric machine controller

An exhaust gas purification catalyst, which is suitable as a three way catalyst for efficiently purifying carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) in exhaust gas discharged from a gasoline automobile and exhaust gas purification apparatus using the same and an exhaust gas purification method. &#x3c;The upper layer&#x3e; A catalyst composition having an activated metal (A), a heat resistant inorganic oxide (B) and a cerium-zirconium-type composite oxide (C) containing a pyrochlore phase in a crystal structure, wherein the activated metal (A) is rhodium. &#x3c;The lower layer&#x3e; A catalyst composition having an activated metal (A), a heat resistant inorganic oxide (B) and a cerium-containing oxide (C') having a cubic crystal and/or tetragonal crystal structure as a major crystal structure, wherein the activated metal (A) is palladium, or palladium and platinum.

Exhaust gas purification catalyst, exhaust gas purification apparatus using the same and exhaust gas purification method

A catalyst system to be used in an automobile exhaust gas purification apparatus which exerts excellent purification capability to a nitrogen oxide, even when hydrocarbon concentration varies, by subjecting exhaust gas discharged from an automotive internal engine to contacting with a catalyst, an exhaust gas purification apparatus using the same, and an exhaust gas purification method. A catalyst system etc. to be used in an automobile exhaust gas purification apparatus, composed by using two or more exhaust gas purification catalysts, containing a first catalyst supported on an inorganic structural carrier and a second catalyst other than this, characterized by having the first catalyst supported on apart of the inorganic structural carrier positioned at the upstream side, when arranged in an exhaust gas passage; on the other hand having the second catalyst supported on a part of the inorganic structural carrier, positioned at the downstream side, when arranged in an exhaust gas passage; and containing a cerium-zirconium-type composite oxide (A) having a pyrochlore phase in the crystal structure.

Catalyst system to be used in automobile exhaust gas purification apparatus, exhaust gas purification apparatus using the same and exhaust gas purification method

This invention relates to a cerium-zirconium-base composite oxide, which is useful, e.g., for the purification of exhaust gas discharged from combustion engines such as internal combustion engines and boilers and can release a high level of oxygen in a low temperature region, a method for producing the same, an oxygen storage/release component using the same, an exhaust gas purification catalyst, and an exhaust gas purification method. The cerium-zirconium-base composite oxide satisfies requirements (1) that the oxygen release initiation temperature is 380&#xb0; C. or below, (2) that the oxygen release amount is not less than 485 &#x3bc;mol/g, and further (3) that the oxygen release amount at 400&#xb0; C. is not less than 15 &#x3bc;mol/g. The cerium-zirconium-base composite oxide can be produced, for example, by mixing a starting material for cerium and a starting material for zirconium at a predetermined mixing ratio together, melting the starting material mixture at a temperature at or above the melting point, then cooling the melt to form an ingot, then optionally grinding the ingot to prepare powder, subsequently removing strain within powder crystal grains under heating, and then grinding to a further fine state.

Cerium/zirconium-base composite oxide, method for producing the same, oxygen storage/release component using said cerium-zirconium-base composite oxide, exhaust gas purification catalyst, and exhaust gas purification method using the same

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Osaka, Japan

Akira Kohara