发明名称 |
CERIA-ZIRCONIA-BASED COMPOSITE OXIDE AND METHOD OF PRODUCTION OF THE SAME |
摘要 |
A ceria-zirconia-based composite oxide which has a crystal phase of the composite oxide of a single solid-solution phase even after exposure to a high temperature over a long time and has a small change in mode pore diameter and in pore volume before and after a high temperature durability test is provided. This is realized by a ceria-zirconia-based composite oxide having a chemical composition, by mass ratio, of zirconia: 30% to 80%, a total of oxides of one or more elements selected from yttrium and rare earth elements having atomic number 57 to 71 (except cerium and promethium): 0% to 20%, and a balance of ceria and unavoidable impurities, in which ceria-zirconia-based composite oxide, the composite oxide is deemed to be a single solid-solution phase in an X-ray diffraction pattern after a durability test which heats the oxide in the atmosphere at a temperature condition of 1100° C. for 5 hours and has a ratio (b/a) of mode pore diameter (b) of a pore distribution after a durability test which heats the oxide in the atmosphere at a temperature condition of 1100° C. for 5 hours to the mode pore diameter (a) before the durability test of 1.0≦b/a≦2.0 and/or has a ratio (d/c) of pore volume (d) after a durability test which heats the oxide in the atmosphere at a temperature condition of 1100° C. for 5 hours to the pore volume (c) before the durability test of 0.20≦d/c≦1.00. |
申请公布号 |
US2016121301(A1) |
申请公布日期 |
2016.05.05 |
申请号 |
US201314895728 |
申请日期 |
2013.12.12 |
申请人 |
NIPPON DENKO CO., LTD. |
发明人 |
SHINGAI YASUHARU;ITOH Tomoharu;NAGOH Wataru |
分类号 |
B01J23/10;B01J37/06;B01J37/00;B01J37/04;B01J37/02 |
主分类号 |
B01J23/10 |
代理机构 |
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代理人 |
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主权项 |
1. A CZ-based composite oxide having a chemical composition, by mass ratio, of zirconia: 30% to 80%, a total of oxides of one or more elements selected from yttrium and rare earth elements having atomic number 57 to 71 (except cerium and promethium): 0% to 20%, and a balance of ceria and unavoidable impurities,
said composite oxide being deemed to be a single solid-solution phase in an X-ray diffraction pattern after a durability test which heats the oxide in an atmosphere at a temperature condition of 1100° C. for 5 hours, wherein a ratio (b/a) of a mode pore diameter (b) of a pore distribution after the durability test which heats the oxide in the atmosphere at the temperature condition of 1100° C. for 5 hours to a mode pore diameter (a) before said durability test is 1.0≦b/a≦2.0. |
地址 |
Chuo-ku, Tokyo JP |