公开(公告)号：US10010868B2

公开(公告)日：2018-07-03

申请号：US14895728

申请日：2013-12-12

申请人： Nippon Denko Co., Ltd.

发明人： Yasuharu Shingai ,  Tomoharu Itoh ,  Wataru Nagoh

IPC分类号： B01J23/10 ,  C01G25/00 ,  C01G25/02 ,  C01F17/00 ,  B01J35/00 ,  B01J37/00 ,  B01J37/02 ,  B01J37/04 ,  B01J37/06

CPC分类号： B01J23/10 ,  B01J35/002 ,  B01J37/009 ,  B01J37/0236 ,  B01J37/04 ,  B01J37/06 ,  B01J2523/00 ,  C01F17/0043 ,  C01G25/00 ,  C01G25/02 ,  C01P2002/50 ,  C01P2002/52 ,  C01P2002/72 ,  C01P2006/12 ,  C01P2006/14 ,  C01P2006/16 ,  B01J2523/3706 ,  B01J2523/3712 ,  B01J2523/3718 ,  B01J2523/3725 ,  B01J2523/48 ,  B01J2523/36

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.