Oxygen storage material and method for producing the same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsYoshihiro Goto, Akira Morikawa, Masahide Miura, Nobuyuki Takagi
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Abstract
An oxygen storage material comprises a Ce—Zr-Ln-Ti-based composite oxide containing cerium (Ce), zirconium (Zr), a rear-earth element (Ln: excluding cerium), and titanium (Ti), wherein at least part of the rear-earth element and at least part of the titanium are solid-dissolved in a composite oxide of the cerium and the zirconium, and the Ce—Zr-Ln-Ti-based composite oxide has a composition expressed by the following chemical formula (1): Cea-xLnxZrb-yTiyOδ (1), where a, b, x, and y are numbers satisfying conditions of a=0.4 to 0.6, b=0.4 to 0.6, x=0 to a (exclusive of x=0 and x=a), y=0 to 0.3 (exclusive of y=0), and a+b=1, and δ is a number of 1.7 to 2.2.
Claims8
An oxygen storage material comprising a Ce—Zr-Ln-Ti-based composite oxide containing cerium (Ce), zirconium (Zr), a rare-earth element (Ln:
- excluding cerium), and titanium (Ti), wherein
- at least part of the rare-earth element and at least part of the titanium are solid-dissolved in a composite oxide of the cerium and the zirconium, and
- the Ce—Zr-Ln-Ti-based composite oxide has a composition expressed by the following chemical formula (1):
- Cea-xLnxZrb-yTiyOδ (1),
- where a, b, x, and y are numbers satisfying conditions of a=0.4 to 0.6, b=0.4 to 0.6, x=0 to a (exclusive of x=0 and x=a), y=0 to 0.3 (exclusive of y=0), and a+b=1, and δ is a number of 1.7 to 2.2.
Dependencies are inferred from the claim text.