Patent Number: 8,067,330

Title: Catalytic material and catalyst for purifying exhaust gas component

Abstract: Disclosed is a catalytic material for purifying an exhaust gas component. The catalytic material comprises a composite oxide which contains, as essential components, zirconium (Zr) and neodymium (Nd), and further contains a rare-earth metal R other than cerium (Ce) and neodymium (Nd), wherein each of the zirconium, neodymium and rare-earth metal R constituting the composite oxide is contained, in the form of oxide, in such a manner that a ratio of Nd.sub.2O.sub.3/(ZrO.sub.2+Nd.sub.2O.sub.3+RO) is 3 mol % or more, and a ratio of (Nd.sub.2O.sub.3+RO)/(ZrO.sub.2+Nd.sub.2O.sub.3+RO) is 33 mol % or less. The catalytic material of the present invention can oxidize/burn PM in a short period of time, while suppressing CO emission during the burning of the PM, and can achieve further enhanced NOx conversion performance.

Inventors: Suzuki; Kenji (Hiroshima, JP), Harada; Koichiro (Hiroshima, JP), Yamada; Hiroshi (Hiroshima, JP), Okamoto; Kenji (Hiroshima, JP), Takami; Akihide (Hiroshima, JP)

Assignee: Mazda Motor Corporation

International Classification: B01J 23/00 (20060101); B01J 23/10 (20060101); B01J 23/42 (20060101); B01J 23/44 (20060101)

Expiration Date: 2020-11-29 0:00:00