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(57) Abstract : An exhaust gas clarifying catalyst which has an A1 oxide and, carried thereon, a Pd oxide, characterized in that the A1 oxide is LnA10 [wherein Ln represents a rare earth element]. The exhaust gas clarifying catalyst has a noble metal itself exhibiting enhanced activityas compared to the metal contained in a conventional catalyst, and also can prevent its catalytic activity from being lowered by the exposure to a high temperature, which results in the exhibition of satisfactory catalyst performance also in the operation at the start-up and in a low temperature operation (at 400°C or lower).