Composite oxide for exhaust gas purifying catalyst and exhaust gas purifying catalyst, and diesel exhaust gas purifying filter
AssigneeDowa Electronics Materials Co., Ltd.
InventorsYuki Kaneshiro, Takuya Yano, Akira Nagatomi
Life of this patent
Estimating the term…
Abstract
To provide an oxidation catalyst capable of burning PM of diesel, engine exhausts gas at a low temperature, and hardly subjected to poisoning due to sulfur oxide. A composite oxide contains Ce, Bi, and M (wherein M is one or more elements selected from Mg, Ca, Sr, and Ba) and oxygen, and is manufactured, with a molar ratio of Ce, Bi, M expressed by Ce:Bi:M=(1−x−y):x:y, satisfying 0<x≦0.4, and 0<y≦0.4. This composite oxide is suitable as a PM combustion catalyst, and is hardly subjected to poisoning due to sulfur oxide.
Claims8
A composite oxide for exhaust gas purifying catalyst, containing Ce, Bi, M (wherein M is one or more elements selected from Mg, Ca, Sr, and Ba) and oxygen.
A composite oxide for exhaust gas purifying catalyst, containing Ce, Bi, M (wherein M is one or more elements selected from Mg, Ca, Sr, and Ba), and R (wherein R is one or more elements selected from Zr, Pr, and Tb) and oxygen.
A composite oxide for exhaust gas purifying catalyst, containing Ce, Bi, M (wherein M is one or more elements selected from Mg, Ca, Sr, and Ba) and oxygen, with a molar ratio of Ce, Bi, M expressed by Ce:Bi:M=(1−x−y):x:y, satisfying 0<x≦0.4, and 0<y≦0.4.
A composite oxide for exhaust gas purifying catalyst, containing Ce, Bi, M (wherein M is one or more elements selected from Mg, Ca, Sr, and Ba), R (wherein R is one or more elements selected from Zr, Pr, and Tb), and oxygen, with a molar ratio of Ce, bi, M, R expressed by Ce:Bi:M:R=(1−x−y−z):x:y:z, satisfying 0<x≦0.4, 0<y≦0.4, 0<z≦0.5, and x+y+z<1.
Dependencies are inferred from the claim text.