发明名称 |
CERIUM-ZIRCONIUM-BASED COMPOSITE OXIDE AND METHOD FOR PRODUCING SAME |
摘要 |
Provided are a cerium-zirconium-based composite oxide that has an excellent OSC, high catalytic activity and excellent heat resistance, and a method for producing the same. The cerium-zirconium-based composite oxide comprises cerium, zirconium and a third element other than these two elements. The third element is either (a) a transition metal element or (b) at least one element selected from a rare earth element and an alkaline earth metal element. After a heat treatment at 1000-1100°C for 3 hours, the cerium-zirconium-based composite oxide shows the following characteristics: (1) the crystal structure contains a pyrochlore phase; (2) the value {I111/(I111+I222)}×100 is 1 or greater [wherein I111 stands for a peak strength on a (111) plane measured by X-ray diffractometry; and I222 stands for a peak strength on a (222) plane measured by X-ray diffractometry]; and (3) the oxygen absorption/emission performance at 600°C is 0.05 mmol/g or greater and the oxygen absorption/emission performance at 750°C is 0.3 mmol/g or greater. |
申请公布号 |
WO2015145788(A1) |
申请公布日期 |
2015.10.01 |
申请号 |
WO2014JP61662 |
申请日期 |
2014.04.25 |
申请人 |
DAIICHI KIGENSO KAGAKU KOGYO CO., LTD. |
发明人 |
HAYASHIDA, HIROYUKI;TATSUMI, AKIKO |
分类号 |
C01G49/00;B01J23/10;B01J23/34;B01J23/72;B01J23/745;B01J23/75;B01J23/755;C01G25/00;C01G45/00;C01G51/00;C01G53/00 |
主分类号 |
C01G49/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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