COMPLEX OXIDE PARTICLES AND EXHAUST GAS PURIFYING CATALYST USING THE SAME

文件类型：PDF文档
文件大小：164K
This invention provides complex oxide particles as carriers that are capable of imparting high heat tolerance and oxygen storage capacity to a catalyst and an exhaust gas purifying catalyst for automobiles using the same. The complex oxide particles comprise ceria-zirconia complex oxide, alumina, yttria, and at least one oxide of an element selected from among rare earth elements other than cerium and yttrium and alkaline earth metals, in which alumina content is 70% to 89% by mass relative to the complex oxide particles and yttria content is 0.01% to 0.22% by mole relative to the ceria-zirconia complex oxide.