Toda Kogyo Corporation

Mazda Motor Corporation

Tomohiro Honda

Tomoaki Urai

Akihide Takami

Hideharu Iwakuni

Katsuaki Kurata

Hiroshi Yamada

Koichiro Harada

Norimichi Nagai

Seiji Miyoshi

Seiji Okazaki

Tetsuro Toda

Wataru Oda

Koji Minoshima

Kazushige Kawai

Ryota Fujimoto

The present invention relates to carbon nanotubes that are excellent in dispersibility and a process for producing the carbon nanotubes. The carbon nanotubes according to the present invention each comprise a wall that comprises a parallel portion and a narrowed portion having a tube outer diameter that is not more than 90% of a tube outer diameter of the parallel portion. Thus, the carbon nanotubes are readily dispersible owing to a high abundance ratio of easily-breaking portions.

Carbon nanotube and process for producing the carbon nanotube, and lithium ion secondary battery using the carbon nanotube

Disclosed is an exhaust gas purifying catalyst, which comprises a CeZr-based composite oxide capable of maintaining a hollow structure to ensure an oxygen absorbing/releasing capability, even after being exposed to high-temperature exhaust gas. The exhaust gas purifying catalyst comprises a honeycomb-shaped substrate, and a catalyst layer formed on a surface of the substrate. The catalyst layer contains a composite oxide which includes cerium (Ce) and zirconium (Zr) and has a hollow structure, and a catalytic metal supported by the composite oxide. The composite oxide having the hollow structure includes, in a state after being subjected to a thermal aging in Air at 1000&#xb0; C. for 24 hours, a particle with a shape having an outer diameter of 750 to 1000 nm and a shell thickness of 80 to 120 nm.

Exhaust gas purifying catalyst

An exhaust gas purification catalyst comprises: an oxygen storage component constituted by a mixed oxide containing cerium and zirconium; and a catalytic metal carried on the oxygen storage component. The oxygen storage component is in the form of hollow secondary particles each formed so that primary particles of an average particle size of less than 10 nm cohere into a shell.

Exhaust gas purification catalyst

The present invention relates to a nanostructural substance constituted from primary particles having a particle diameter of not more than 30 nm. In the nanostructural substance of the present invention, the primary particles have a small particle diameter, and a contact surface between the primary particles is small. In particular, since the nanostructural substance of the present invention has a large content of molecules existing at the surface thereof and, therefore, a high surface energy as compared to simple agglomerated particles, it is expected to more remarkably exhibit functions of the compound constituting the primary particles. In addition, titanium oxide particles constituted from the nanostructural substance comprising primary particles having a small particle diameter and a small contact area therebetween according to the present invention exhibit a high catalytic activity and can be suitably used, in particular, as a photocatalyst.

Nanostructural substance

Growing community of inventors

Hiroshima, Japan

Tomohiro Honda