| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust gas cleaning catalyst having a high specific surface area, oxygen storage/release capacity (OSC) and durability. <P>SOLUTION: The exhaust gas cleaning catalyst is obtained by supporting at least one kind of noble metals on a carrier comprising a multiple oxide containing CeO<SB>2</SB>and ZrO<SB>2</SB>as main components, and then heat treating the supported catalyst at 600 to 1,000°C under a reducing atmosphere. Because the noble metal functions as an outlet and an inlet for absorption and release of the lattice oxygen of CeO<SB>2</SB>, it becomes possible to release oxygen atom under a reducing atmosphere of a temperature lower than a conventional temperature. Thus, it becomes easy to release oxygen atom, and accordingly, the arrangement of Ce cations and Zr cations closes to a regular array, and high OSC is realized. <P>COPYRIGHT: (C)2003,JPO |
