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ZIRCONIA-CERIA-YTTRIA-BASED MIXED OXIDE AND PROCESS FOR PRODUCING THE SAME 发明申请

2023-07-27 3140 66K 0

专利信息

申请日期 2025-07-16 申请号 JP2007206394
公开(公告)号 JP2008115070A 公开(公告)日 2008-05-22
公开国别 JP 申请人省市代码 全国
申请人 DAIICHI KIGENSOKAGAKU KOGYO CO
简介 PROBLEM TO BE SOLVED : To provide a zirconia-ceria-yttria-based mixed oxide maintaining a stable crystal structure after 12 hours of heat treatment at 1, 100°C under a reducing atmosphere, and a process for producing the same. SOLUTION : The process comprises the steps of : (1) mixing a zirconium salt, a yttrium salt and an acid to obtain a zirconium-yttrium-containing acidic solution; (2) adding a sulfating agent and an alkali to the zirconium-yttrium-containing acidic solution to obtain a yttrium hydroxide-zirconium salt-sulfating agent-containing slurry; (3) heating the yttrium hydroxide-zirconium salt-sulfating agent-containing slurry to 65°C or higher to obtain a basic zirconium sulfate-yttrium hydroxide-containing mixed slurry; (4) adding a cerium salt, and, as necessary, one or more salts of rare earth elements other than Ce and Y to the basic zirconium sulfate-yttrium hydroxide-containing mixed slurry to obtain a basic zirconium sulfate-yttrium hydroxide-cerium salt-containing mixed slurry; (5) adding an alkali to the basic zirconium sulfate-yttrium hydroxide-cerium salt-containing mixed slurry to obtain a zirconium hydroxide-cerium hydroxide-yttrium hydroxide-containing mixed oxide; and (6) heat-treating the zirconium hydroxide-cerium hydroxide-yttrium hydroxide-containing mixed hydroxide to obtain a zirconium-ceria-yttria-based mixed oxide. COPYRIGHT : (C)2008, JPO&INPIT


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