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PROBLEM TO BE SOLVED : To provide a catalyst for cleaning exhaust gas, which has high thermal durability. SOLUTION : This catalyst for cleaning exhaust gas is composed of a catalyst depositing layer and a noble metal catalyst and a NOx storage material which are deposited on the catalyst depositing layer. A compound oxide which is shown by the formula : AxByOz(wherein A is at least one metal selected from alkali metals and alkaline-earth metals; B is at least one metal selected from transition metals and rare-earth metals; 0COPYRIGHT : (C)2005, JPO&NCIPI