| 摘要 |
<P>PROBLEM TO BE SOLVED: To selectively produce an exhaust gas purification catalyst carrier comprising a ceria-zirconia multiple oxide or a catalyst and a catalyst product which is excellent in initial characteristics and durability and in which the dispersion of characteristics is reduced. <P>SOLUTION: In a method for producing the exhaust gas purification catalyst carrier, the ceria-zirconia catalyst carrier whose X-ray diffraction pattern obtained by X-ray diffraction measurement shows the structure of a cubic system crystal is selected by judging whether a peak exists in the vicinity of about 300 cm<SP>-1</SP>of a Raman spectrum or not and produced, and the catalyst is produced by making the selected carrier support a noble metal selected from Pt, Pd, Rh, etc. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
