CATALYST FOR EXHAUST GAS PURIFICATION

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PROBLEM TO BE SOLVED : To provide a catalyst for exhaust gas purification containing an occlusion material in which a catalyst noble metal can exert a catalytic function sufficiently even in a mass ratio range of ZrO2 except the range of 20-30 mass% or 65-90 mass%, as an oxygen storage material arranged between crystal lattices or lattice points of a double oxide containing Ce and Zr. SOLUTION : In the catalyst for exhaust gas purification which has a catalyst layer containing a cerium-zirconium (CeZr) double oxide, the double oxide contains ceria (CeO2) and zirconia (ZrO2) in the range that a mass ratio of ceria to a total mass of ceria and zirconia becomes to be ≥36 mass% and ≤64 mass%, and at the same time, contains a rare-earth metal except cerium (Ce) as an oxide to a total mass of the double oxide in the range of ≥3 mass% and ≤20 mass%. COPYRIGHT : (C)2007, JPO&INPIT