Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Naoki Kumatani

Masahide Miura

Akira Morikawa

Hiromasa Suzuki

Toshitaka Tanabe

Takahiro Hayashi

Akihiko Suda

Isao Chinzei

Miho Hatanaka

Takeshi Nobukawa

Kimitoshi Sato

Kae Konishi

Taizo Yoshinaga

Masaoki Iwasaki

A catalyst for purification of exhaust gas in which Pd-based nanoparticles and ceria nanoparticles are supported on a composite metal oxide support containing alumina, ceria, and zirconia, wherein a molar ratio (Ce/Pd) of Ce and Pd supported on the support is 1 to 8, a proximity α between Pd and Ce is 0.15 to 0.50, wherein the proximity α is determined, based on Pd and Ce distribution maps in an element mapping image of energy dispersive X-ray analysis, by the following formula (1): a Pd dispersity after a heat-resistance test at 1050° C. for 25 hours is 0.8% or more.

Catalyst for purification of exhaust gas and production method thereof

A core-shell oxide material comprises: a core which comprises a ceria-zirconia based solid solution powder having at least one ordered phase of a pyrochlore phase and a &#x3ba; phase; and a shell which comprises an alumina based oxide disposed on at least a portion of a surface of the core.

Core-shell oxide material, method for producing the same, and catalyst and method for purification of exhaust gas using the core-shell oxide material

A catalyst support for purification of exhaust gas includes a porous composite metal oxide, the porous composite metal oxide containing alumina, ceria, and zirconia and having an alumina content ratio of from 5 to 80% by mass, wherein after calcination in the air at 1100&#xb0; C. for 5 hours, the porous composite metal oxide satisfies a condition such that standard deviations of content ratios (as at % unit) of aluminum, cerium and zirconium elements are each 19 or less with respect to 100 minute areas (with one minute area being 300 nm in length&#xd7;330 nm in width) of the porous composite metal oxide, the standard deviation being determined by energy dispersive X-ray spectroscopy using a scanning transmission electron microscope equipped with a spherical aberration corrector.

Catalyst support for purification of exhaust gas, catalyst for purification of exhaust gas using the same, and method for producing the catalyst support for purification of exhaust gas

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Nagakute, Japan

Naoki Kumatani