| 摘要 |
<P>PROBLEM TO BE SOLVED: To produce a catalyst which is provided with a catalyst carrier having a high oxygen absorbing/releasing performance. <P>SOLUTION: The catalyst having the high oxygen absorbing/releasing performance can be obtained by using, as the catalyst carrier, A<SB>2</SB>O<SB>2</SB>SO<SB>4</SB>(wherein A is a rare-earth element) obtained by firing a raw material being a sulfate of the rare-earth element in air at ≥800°C to decompose a part of the sulfate group. The catalyst carrier shown by the formula A<SB>2</SB>O<SB>2</SB>SO<SB>4</SB>changes into A<SB>2</SB>O<SB>2</SB>S in a reducing atmosphere of high temperature (≥ about 800°C) while releasing the absorbed oxygen to the outside. The A<SB>2</SB>O<SB>2</SB>S changes into the A<SB>2</SB>O<SB>2</SB>SO<SB>4</SB>in an oxidizing atmosphere while absorbing oxygen. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
