Nissan Motor Company Limited

Renault S.a.s.

Jun Ikezawa

Masanori Nakamura

Katsuo Suga

Hironori Wakamatsu

Kazuyuki Shiratori

Hiroto Kikuchi

Tetsuro Naito

Toshiharu Miyamura

Hirofumi Yasuda

Makoto Aoyama

Junji Ito

Masahiro Takaya

Maki Shimada

Kiyoshi Miyazaki

An object is to maintain an effect of enhancing activity of noble metal particles by transition metal without increasing production cost and an environmental load. An exhaust gas purifying catalystis composed of: noble metal particles; first compoundswhich contact the noble metal particlesand suppress movement of the noble metal particles; and second compoundswhich contain the noble metal particlesand the first compounds, suppress the movement of the noble metal particles, and suppress coagulation of the first compoundsfollowing mutual contact of the first compounds, wherein the first compoundssupport the noble metal particles, and simplexes or aggregates of the first compoundssupporting the noble metal particlesare included in section partitioned by the second compounds

Exhaust gas purifying catalyst and production method thereof

An exhaust gas purifying catalyst () according to the present invention includes noble metal particles (), a first compound () supporting the noble metal particles (), and a second compound () disposed not in contact with the noble metal particles () and having an oxygen storage capacity. An average distance between the first compound () and the second compound () is between 5 nm and 300 nm.

Exhaust gas purifying catalyst and method for manufacturing the same

An exhaust gas purifying catalyst includes a monolithic substrate (), and a transition metal oxide layer () formed in the monolithic substrate (). The transition metal oxide layer () contains transition metal oxide powder including: transition metal oxide particles (); a first compound () on which the transition metal oxide particles () are supported; and a second compound () that surrounds a single body or an aggregate of the transition metal oxide particles () and the first compound ().

Exhaust gas purifying catalyst

A high heat-resistant catalyst includes: noble metal particles; first compounds which contact the noble metal particles and suppress movement of the noble metal particles; and second compounds which envelop the noble metal particles and the first compounds, suppress the movement of the noble metal particles, and suppress coagulation of the first compounds following mutual contact of the first compounds. The first compounds support the noble metal particles, and single piece or aggregate of the first compounds supporting the noble metal particles are included in a section partitioned by the second compounds. A coefficient of linear thermal expansion of the second compounds is 1.2&#xd7;10[K] or less.

High heat-resistant catalyst and manufacturing method thereof

Disclosed is an exhaust gas purifying catalyst exhibiting excellent purification performance for a long period of time by suppressing coagulation of a noble metal. A catalyst powder comprises a noble metal and first and second compounds. In the catalyst powder, the first compound carries the noble metal and is separated from another first compound carrying a noble metal by the second compound. At least one catalyst layer comprising the catalyst powder is formed on an inner surface of a substrate. The catalyst layer has fine pores. A fine pore volume of fine pores having a fine pore diameter of greater than 0.1 &#x3bc;m to less than or equal to 1 &#x3bc;m is 10% to 60% of the fine pore volume of fine pores having a pore diameter of 1.0 &#x3bc;m or less.

Exhaust gas purifying catalyst and method of producing the same

An exhaust gas purifying catalyst that includes noble metal particles, first compounds which support the noble metal particles and suppress movement of the noble metal particles, and second compounds which encapsulate the noble metal particles and the first compounds. The second compounds suppress the movement of the noble metal particles and suppress coagulation of the first compounds following mutual contact of the first compounds.

Exhaust gas purifying catalyst and manufacturing method thereof

An exhaust gas purifying catalyst including: rhodium particles having catalytic activity; compound particles which are formed on peripheries of the rhodium particles and support the rhodium particles; and oxides which are formed on peripheries of the compound particles and suppress coagulation of the compounds.

An exhaust gas purifying catalyst of the present invention has a substrate, and a catalyst layer formed on an inner wall of the substrate and composed of at least a single layer. The catalyst layer contains a carrier supporting noble metal. Further, a maximum height of profile of a surface of a top layer in the catalyst layer is not less than 2 &#x3bc;m and not more than 50 &#x3bc;m, and the top layer contains the carrier supporting noble metal.

Growing community of inventors

Yokosuka, Japan

Jun Ikezawa