| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a catalyst for purifying an exhaust gas having a sufficient amount of zeolite for adsorbing and purifying a low temperature HC, and satisfying sufficient NOx purification performance with a small amount of NOx adsorption catalyst. <P>SOLUTION: A zeolite layer is laminated with a catalyst powder containing layer including a catalyst powder obtained by a step A for impregnating an alumina powder into which Ce of 10% or more is dissolved in solid state with Ce, Pr, Nd or the like of 10 to 30% , Ba of 4 to 15% and Mg of 5% or less as an acetate, a step B for drying the powder and baking this at 600°C or higher, a step C for wet-crushing the powder to a size of 3.0 to 3.5 μm and impregnating this with an alkaline noble metal salt in the same crusher, and a step D for drying the powder and baking this at 400°C or higher to manufacture the catalyst for purifying the exhaust gas. The catalyst for purifying the exhaust gas is to use a Ce dissolved alumina in solid state in which an XRD peak satisfies Ce(200) plane peak integrated intensity/Ce(111) plane peak integrated intensity > 0.6 in the step A. A BaO/Pt ratio of the catalyst powder containing layer is 8 or less. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
