Exhaust gas-purifying catalyst
AssigneesCataler Corporation, Daihatsu Motor Co., Ltd.
InventorsSatoshi Matsueda, Mareo Kimura, Akimasa Hirai, Keiichi Narita, Hirohisa Tanaka, Mari Uenishi, Isao Tan, Masashi Taniguchi
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Abstract
An exhaust gas-purifying catalyst (1) contains a rare-earth element, an alkaline-earth element, zirconium and a precious metal, wherein an atomic ratio of the alkaline-earth element with respect to a sum of the rare-earth element and the zirconium is 10 atomic % or more, a part of the rare-earth element and a part of zirconium form a composite oxide with at least a part of the alkaline-earth element, and the composite oxide and a part of the precious metal form a solid solution.
Claims21
An exhaust gas-purifying catalyst comprising a rare-earth element, an alkaline-earth element, zirconium and a precious metal, an atomic ratio of the alkaline-earth element with respect to a sum of the rare-earth element and the zirconium being 10 atomic % or more, a part of the rare-earth element and a part of zirconium forming a composite oxide with at least a part of the alkaline-earth element, and the composite oxide and 10% to 80% of the precious metal forming a solid solution.
Dependencies are inferred from the claim text.