複合酸化物とその製造方法および排ガス浄化触媒

Japanese Patent JP5833965

B2

PROBLEM TO BE SOLVED: To provide a compound oxide in which a pyrochlore phase is stabilized by arranging a diffusion barrier around the pyrochlore phase and which is excellent in an oxygen storage capacity and is used for an exhaust gas purifying catalyst, and to provide an exhaust gas purifying catalyst including the compound oxide, and further, a method for producing the compound oxide.SOLUTION: A compound oxide is composed of an MgAlO-CeO-ZrOternary system compound oxide, and has a pyrochlore phase in which Ce and Zr are regularly arrayed. A method for producing the compound oxide includes: a step of adding a precipitant to a solution containing a cerium compound and a zirconium compound to form a first coprecipitate, firing it, and obtaining a first fired material; a step of adding a precipitant to a solution containing a magnesium compound and an aluminum compound to form a second coprecipitate, firing it, and obtaining a second fired material; and a step of producing the compound oxide which is composed of the MgAlO-CeO-ZrOternary system compound oxide, and has the pyrochlore phase in which Ce and Zr are regularly arrayed, by mixing, heating and reducing the first and second fired materials.

Naoki Kumagai
Miura Masahide
Yujiro Honma
Minoru Tanabe
Akira Morikawa
Yoshie Yamamura

JP2012086825A

December 16, 2015

April 05, 2012

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TOYOTA JIDOSHA KABUSHIKI KAISHA
Toyota Central R & D Labs.

B01J23/63; B01D53/94; B01J37/04; F01N3/10

JP2003073123A
JP2007167780A

Yusuke Hiraki
Sekiya Mitsuo
Ishikawa Takiharu

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