Patent ID: 7604789
Filing Date: 2009-10-20
Classification: B01D,B01J,B82Y,C01B,C01F,C01G,C01P,Y02T

Abstract:
1. 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.