Porous composite oxide and production method thereof
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsShinichi Takeshima, Kohei Yoshida, Akio Koyama
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Abstract
The present invention provides a porous composite oxide comprising an aggregate of secondary particles in the form of aggregates of primary particles of a composite oxide containing two or more types of metal elements, and having mesopores having a pore diameter of 2-100 nm between the secondary particles; wherein, the percentage of the mesopores between the secondary particles having a diameter of 10 nm or more is 10% or more of the total mesopore volume after firing for 5 hours at 600° C. in an oxygen atmosphere.
Claims1
A porous composite metal oxide comprising an aggregate of secondary particles in the form of aggregates of primary particles of a composite metal oxide containing two or more metal elements, and having mesopores having a pore diameter of 2-100 nm between the secondary particles;
- wherein:
- the percentage of the number of mesopores between the secondary particles having a diameter of 10 nm or more is 10% or more of the number of mesopores contributing to the total mesopore volume after firing for 5 hours at 600° C. in an oxygen atmosphere;
- the particle diameter of the primary particles is 3-15 nm and the particle diameter of the secondary particles is 30-100 nm;
- and
- the metal elements are at least cerium and zirconium.
Dependencies are inferred from the claim text.