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1. 发明专利

JP2008018418A Catalyst for cleaning exhaust gas 有权
标题翻译：催化剂用于清洁排气
公开(公告)号：JP2008018418A
公开(公告)日：2008-01-31
申请号：JP2006351442
申请日：2006-12-27
申请人： Toyota Central Res & Dev Lab Inc , Toyota Motor Corp , トヨタ自動車株式会社 , 株式会社豊田中央研究所
发明人： TANABE TOSHITAKA , NAGAI YASUTAKA , HATANAKA YOSHIO , DOMAE KAZUHIKO , YAMAMOTO TOSHIO , TAKAGI NOBUYUKI , IKEDA YASUO
IPC分类号： B01J23/63 , B01D53/94 , B01J23/58 , B01J37/08 , F01N3/10
CPC分类号： B01D53/945 , B01J23/002 , B01J23/10 , B01J23/58 , B01J23/63 , B01J35/0006 , B01J37/0018 , B01J37/03 , B01J37/04 , B01J2523/00 , Y02T10/22 , B01J2523/25 , B01J2523/48 , B01J2523/828 , B01J2523/3712 , B01J2523/3706
摘要： PROBLEM TO BE SOLVED: To provide a catalyst for cleaning an exhaust gas capable of exhibiting a high catalytic activity under a usual service condition and sufficiently suppressing a reduction in the catalytic activity even if it is exposed to an exhaust gas of high temperature for a long period of time. SOLUTION: The catalyst for cleaning the exhaust gas includes a composite oxide of a material (A) capable of releasing a noble metal at a high temperature, zirconia and/or alumina, and at least one element selected from the group consisting of an alkaline earth metal element, an rare earth element and a group 3A element, and is provided with a material (B) for receiving the precious metal released from the material (A) at a high temperature. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种能够在通常使用条件下能够显示高催化活性的废气的清洁催化剂，并且即使暴露于高温废气也能充分抑制催化活性的降低很长一段时间。解决方案：用于清洁废气的催化剂包括能够在高温下释放贵金属的材料（A），氧化锆和/或氧化铝的复合氧化物和选自以下的至少一种元素：碱土金属元素，稀土元素和3A族元素，并且在高温下设置有用于接收从材料（A）释放的贵金属的材料（B）。版权所有（C）2008，JPO＆INPIT

2. 发明专利

JP2007331992A Inorganic oxide and exhaust gas cleaning catalyst using the same 有权
标题翻译：无氧氧化物和排气使用相同的气体清洁催化剂
公开(公告)号：JP2007331992A
公开(公告)日：2007-12-27
申请号：JP2006167111
申请日：2006-06-16
申请人： Toyota Central Res & Dev Lab Inc , Toyota Motor Corp , トヨタ自動車株式会社 , 株式会社豊田中央研究所
发明人： MORIKAWA AKIRA , TANABE TOSHITAKA , TAKAHASHI NAOKI , YAMAMURA YOSHIE , YOSHIDA TAKESHI , SATO AKEMI
IPC分类号： C01G25/00 , B01D53/86 , B01J23/63
CPC分类号： C01B13/363 , B01D53/945 , B01D2255/202 , B01D2255/204 , B01D2255/206 , B01D2255/40 , B01D2255/407 , B01J23/002 , B01J23/58 , B01J23/63 , B01J35/023 , B01J37/0201 , B01J37/031 , B01J2523/00 , B82Y30/00 , C01G23/047 , C01G25/02 , C01P2002/50 , C01P2002/52 , C01P2004/04 , C01P2004/64 , C01P2006/32 , Y02T10/22 , B01J2523/31 , B01J2523/3725 , B01J2523/48 , B01J2523/3706
摘要： PROBLEM TO BE SOLVED: To provide an inorganic oxide having excellent heat resistance. SOLUTION: The particulate inorganic oxide contains aluminum oxide, a metal oxide which does not form a compound oxide with aluminum oxide, and at least one additional element selected from the group composed of rare earth elements and alkaline-earth elements. This inorganic oxide is characterized in that the content of the aluminum oxide is 48-92 atomic% of the total amount of aluminum of the aluminum oxide, a metallic element of the metal oxide and the additional element in terms of elements, ≥80% of primary particles of the inorganic oxide have each ≤100 nm particle size, at least a part of the primary particle of the inorganic oxide has an additional element-concentrated surface zone, where the content of the additional element is made higher locally, in the surface layer, and the amount of the additional element in the additional element-concentrated surface zone is 0.06-0.98 mass% of the total amount of the inorganic oxide in terms of oxides. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：解决的问题：提供耐热性优异的无机氧化物。解决方案：颗粒无机氧化物含有氧化铝，不与氧化铝形成复合氧化物的金属氧化物和至少一种选自稀土元素和碱土金属元素的附加元素。该无机氧化物的特征在于，氧化铝的含量为氧化铝的铝总量的48-92原子％，金属氧化物的金属元素和元素的附加元素的含量≥80％无机氧化物的一次颗粒具有≤100nm的粒度，无机氧化物的一次粒子的至少一部分具有附加元素浓缩表面区域，其中附加元素的含量在局部变得更高，在表面附加元素浓缩表面区域中的附加元素的量为氧化物换算为无机氧化物总量的0.06〜0.98质量％。版权所有（C）2008，JPO＆INPIT

3. 发明专利

JP2007331991A Inorganic oxide and exhaust gas cleaning catalyst using the same 有权
标题翻译：无氧氧化物和排气使用相同的气体清洁催化剂
公开(公告)号：JP2007331991A
公开(公告)日：2007-12-27
申请号：JP2006167110
申请日：2006-06-16
申请人： Toyota Central Res & Dev Lab Inc , Toyota Motor Corp , トヨタ自動車株式会社 , 株式会社豊田中央研究所
发明人： MORIKAWA AKIRA , TANABE TOSHITAKA , TAKAHASHI NAOKI , YAMAMURA YOSHIE , YOSHIDA TAKESHI , SATO AKEMI
IPC分类号： C01G25/00 , B01D53/94 , B01J23/63
CPC分类号： C01B13/363 , B01D53/945 , B01D2255/204 , B01D2255/206 , B01D2255/40 , B01D2255/407 , B01J23/002 , B01J23/63 , B01J35/002 , B01J35/023 , B01J2523/00 , C01G25/02 , Y02T10/22 , B01J2523/31 , B01J2523/3706 , B01J2523/3725 , B01J2523/48 , B01J2523/822
摘要： PROBLEM TO BE SOLVED: To provide an inorganic oxide having excellent heat resistance. SOLUTION: The particulate inorganic oxide contains aluminum oxide, a metal oxide which does not form a compound oxide with aluminum oxide, and at least one additional element selected from the group composed of rare earth elements and alkaline-earth elements. This inorganic oxide is characterized in that the content of the additional element is 1.1-8.0 atomic% of the total amount of aluminum of the aluminum oxide, a metallic element of the metal oxide and the additional element in terms of elements, ≥80% of primary particles of the inorganic oxide have each ≤100 nm particle size, at least a part of the primary particle of the inorganic oxide has an additional element-concentrated surface zone, where the content of the additional element is made higher locally, in the surface layer part, and the amount of the additional element in the additional element-concentrated surface zone is 0.06-0.98 mass% of the total amount of the inorganic oxide in terms of oxides. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：解决的问题：提供耐热性优异的无机氧化物。解决方案：颗粒无机氧化物含有氧化铝，不与氧化铝形成复合氧化物的金属氧化物和至少一种选自稀土元素和碱土金属元素的附加元素。该无机氧化物的特征在于，附加元素的含量为氧化铝的铝总量的1.1-8.0原子％，金属氧化物的金属元素和元素中的附加元素的≥80％无机氧化物的一次颗粒具有≤100nm的粒度，无机氧化物的一次粒子的至少一部分具有附加元素浓缩表面区域，其中附加元素的含量在局部变得更高，在表面附加元素浓缩表面区域中的附加元素的量为氧化物换算为无机氧化物总量的0.06〜0.98质量％。版权所有（C）2008，JPO＆INPIT

4. 发明专利

JP2007260564A Exhaust gas-purifying catalyst and method for regenerating the same 有权
标题翻译：排气净化催化剂及其再生方法
公开(公告)号：JP2007260564A
公开(公告)日：2007-10-11
申请号：JP2006089120
申请日：2006-03-28
申请人： Toyota Central Res & Dev Lab Inc , Toyota Motor Corp , トヨタ自動車株式会社 , 株式会社豊田中央研究所
发明人： HATANAKA YOSHIO , TANABE TOSHITAKA , NAGAI YASUTAKA , YAMAMOTO TOSHIO , DOMAE KAZUHIKO , TAKAGI NOBUYUKI
IPC分类号： B01J23/89 , B01D53/86 , B01D53/94 , B01J23/96 , B01J38/18 , F01N3/10 , F01N3/20
CPC分类号： Y02T10/47
摘要： PROBLEM TO BE SOLVED: To provide an exhaust gas-purifying catalyst capable of sufficiently suppressing a coagulation of noble metal particles even if they are exposed to a high-temperature exhaust gas for a long period of time to sufficiently suppress a grain growth of a noble metal for a long period of time, thereby enabling the system to sufficiently suppress the deterioration of a catalytic activity, easily regenerating the catalytic activity by re-dispersing the noble metal that is grain grown when in use, and easily regenerating the catalyst even if the catalyst is mounted on an exhaust system of an internal engine, and to provide a method for regenerating the exhaust gas-purifying catalyst. SOLUTION: The exhaust gas-purifying catalyst having a carrier containing a composite oxide with at least one element selected from a group consisting of zirconia and/or alumina, alkali earth metal element, rare earth element and IIIA group element, a noble metal that is supported in the carrier, and iron that is supported in the carrier, wherein a supported amount of the noble metal should be in a scope of 0.05 to 2 mass% to the mass of the catalyst, and a supported amount of iron should be in a scope of 0.8 to 12 that is mole ratio (amount of iron/amount of noble metal) to the mass of the noble metal in metal conversion. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：解决的问题：提供一种能够充分抑制贵金属粒子的凝固的排气净化催化剂，即使它们长时间暴露于高温废气以充分抑制晶粒生长的贵金属，从而使系统能够充分抑制催化活性的劣化，容易再生分解使用时晶粒生长的贵金属，并容易再生催化剂的催化活性即使将催化剂安装在内燃机的排气系统上，也可以提供再生废气净化用催化剂的方法。解决方案：具有载体的废气净化催化剂，该载体含有选自氧化锆和/或氧化铝，碱土金属元素，稀土元素和IIIA族元素中的至少一种元素的复合氧化物，贵金属负载在载体中的金属和负载在载体中的铁，其中贵金属的负载量相对于催化剂的质量应为0.05〜2质量％的范围，并且负载量的铁应该在金属转化中摩尔比（贵金属的量/贵金属的量）与贵金属的质量的摩尔比为0.8〜12的范围。版权所有（C）2008，JPO＆INPIT

5. 发明专利

JP2006036556A Inorganic oxide, exhaust gas purification catalyst support and exhaust gas purification catalyst 有权
标题翻译：无机氧化物，排气净化催化剂支持和排气净化催化剂
公开(公告)号：JP2006036556A
公开(公告)日：2006-02-09
申请号：JP2004214932
申请日：2004-07-22
申请人： Toyota Central Res & Dev Lab Inc , Toyota Motor Corp , トヨタ自動車株式会社 , 株式会社豊田中央研究所
发明人： MORIKAWA AKIRA , TANABE TOSHITAKA , YAMAMURA YOSHIE , TAKAHASHI NAOKI , SUZUKI HIROMASA , KUNO HISASHI , SATO AKEMI , ISHIKIRIYAMA MAMORU , KANAZAWA TAKAAKI
IPC分类号： C01G25/00 , B01D53/86 , B01D53/94 , B01J23/10 , B01J23/63 , B01J37/03 , B01J37/08 , F01N3/10
摘要： PROBLEM TO BE SOLVED: To provide an inorganic oxide in which the grain growth of a supported metal (rhodium or the like) is satisfactorily suppressed, an exhaust gas purification catalyst support comprising the same and an exhaust gas purification catalyst using the same. SOLUTION: In the particulate inorganic oxide containing aluminum oxide, a metal oxide which does not form a compound oxide with aluminum oxide and an additive element comprising at least one of a rare earth element and an alkaline earth element, the content of aluminum oxide is 15-40 mol% per total quantity of aluminum in the aluminum oxide, a metal element in the metal oxide and the additive element, ≥80% of the primary particle of the inorganic oxide has ≤100 nm particle diameter and at least a part of the primary particle has a surface layer part having a concentrated zone where the content of the additive element is locally increased. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：为了提供令人满意地抑制负载金属（铑等）的晶粒生长的无机氧化物，包含该负载金属的铑等的废气净化催化剂载体和使用其的废气净化催化剂。解决方案：在含氧化铝的颗粒状无机氧化物中，不与氧化铝形成复合氧化物的金属氧化物和包含稀土元素和碱土金属元素中的至少一种的添加元素，铝的含量氧化铝中的铝的总量为15〜40摩尔％，金属氧化物中的金属元素和添加元素的≥80％的无机氧化物的一次粒子的粒径≤100nm，至少为初级颗粒的一部分具有表面层部分，其具有局部增加添加元素的含量的浓缩区域。版权所有（C）2006，JPO＆NCIPI

6. 发明专利

JP2004074055A Method of forming catalyst carrying layer 审中-公开
公开(公告)号：JP2004074055A
公开(公告)日：2004-03-11
申请号：JP2002239471
申请日：2002-08-20
申请人： Toyota Central Res & Dev Lab Inc , Toyota Motor Corp , トヨタ自動車株式会社 , 株式会社豊田中央研究所
发明人： TAMURA HIROSHI , ITO YUSUKE , KUNO HISASHI , SOFUGAWA HIDEO , MATSUNAGA SHINICHI , TANABE TOSHITAKA
IPC分类号： F01N3/28 , B01D53/86 , B01J23/42 , B01J35/04
摘要： PROBLEM TO BE SOLVED: To provide a method of forming a catalyst carrying layer without requiring a high temperature baking which is apt to induce decrease in performance. SOLUTION: In the method of forming a catalyst carrying layer, powder soluble in one of an organic solvent, an acid solvent or a basic solvent and hardly soluble or insoluble in water is added to a slurry for formation of a catalyst carrying layer, and then the slurry is applied onto a monolithic carrier, dried, and thereafter the carrier is immersed in a solvent in which the powder is soluble to elute and remove the powder. COPYRIGHT: (C)2004,JPO

7. 发明专利

JP2008023483A Catalyst for purifying exhaust gas, its manufacturing method and its regenerating method 有权
标题翻译：用于净化排气的催化剂及其制备方法及其再生方法
公开(公告)号：JP2008023483A
公开(公告)日：2008-02-07
申请号：JP2006200843
申请日：2006-07-24
申请人： Toyota Central Res & Dev Lab Inc , Toyota Motor Corp , トヨタ自動車株式会社 , 株式会社豊田中央研究所
发明人： YAMAMOTO TOSHIO , NAGAI YASUTAKA , TANABE TOSHITAKA , HATANAKA YOSHIO , DOMAE KAZUHIKO , TAKAGI NOBUYUKI , MIURA MASAHIDE , IKEDA YASUO
IPC分类号： B01J23/58 , B01J23/96 , B01J38/18
摘要： PROBLEM TO BE SOLVED: To provide a catalyst for purifying exhaust gas, the deterioration of whose activity can be restrained by restraining the grain growth of a noble metal even if the catalyst for purifying exhaust gas is exposed in high-temperature exhaust gas for a long time and which can be regenerated by breaking up the grain-grown noble metal again into satisfactorily minute particles. SOLUTION: The catalyst for purifying exhaust gas comprises: a compound oxide particle A which consists of a metal oxide containing alumina at least and a first basic oxide, that is deposited on the surface of the metal oxide and contains at least one element selected from the group consisting of alkaline-earth metallic elements, rare earth elements and 3A group elements, and in which the amount of the first basic oxide to be deposited on the metal oxide is 0.1-30 mass%; another compound oxide particle B consisting of zirconia and a second basic oxide containing at least one element selected from the group consisting of alkaline-earth metallic elements, rare earth elements and 3A group elements; an additional component which is deposited on the compound oxide particle B and contains at least one element selected from the group consisting of alkaline-earth metallic elements, rare earth elements and 3A group elements; and the noble metal deposited on the compound oxide particle B at least. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：为了提供一种用于净化废气的催化剂，即使在废气净化用催化剂暴露于高温废气中的情况下，也可以通过抑制贵金属的晶粒生长来抑制其活性的劣化长时间并且可以通过将晶粒生长的贵金属再次分解成令人满意的微小颗粒而再生。解决方案：用于净化废气的催化剂包括：复合氧化物颗粒A，其由至少含有氧化铝的金属氧化物和第一碱性氧化物组成，其沉积在金属氧化物的表面上并且含有至少一种元素选自碱土金属元素，稀土元素和3A族元素，其中沉积在金属氧化物上的第一碱性氧化物的量为0.1-30质量％; 由氧化锆和含有选自碱土金属元素，稀土元素和3A族元素中的至少一种元素的第二碱性氧化物构成的复合氧化物粒子B; 沉积在复合氧化物颗粒B上并含有选自碱土金属元素，稀土元素和3A族元素中的至少一种元素的附加成分; 以及至少沉积在复合氧化物粒子B上的贵金属。版权所有（C）2008，JPO＆INPIT

8. 发明专利

JP2007289920A Exhaust-gas cleaning catalyst, its regeneration method, exhaust-gas cleaning apparatus and exhaust-gas cleaning method using it 有权
标题翻译：排气清洁催化剂，其再生方法，排气清洁装置和使用其的排气清洁方法
公开(公告)号：JP2007289920A
公开(公告)日：2007-11-08
申请号：JP2006325206
申请日：2006-12-01
申请人： Toyota Central Res & Dev Lab Inc , Toyota Motor Corp , トヨタ自動車株式会社 , 株式会社豊田中央研究所
发明人： NAGAI YASUTAKA , TANABE TOSHITAKA , DOMAE KAZUHIKO , HATANAKA YOSHIO , YAMAMOTO TOSHIO , TAKAGI NOBUYUKI , MIURA MASAHIDE , IKEDA YASUO
IPC分类号： B01J23/63 , B01D53/94 , B01J23/58 , B01J23/89 , B01J38/02 , B01J38/10 , B01J38/12 , F01N3/10 , F01N3/20
CPC分类号： Y02T10/47
摘要： PROBLEM TO BE SOLVED: To provide an exhaust-gas cleaning catalyst which can fully control aggregation of particles of a noble metal to fully control growth of particles of the noble metal for a long time even if exposed to an exhaust gas of high temperature for a long time and re-distribute particles of the noble metal in a short time to easily regenerate the catalyst activity even if in a comparatively low-temperature range when growing of the particles in its using. SOLUTION: The exhaust-gas cleaning catalyst has the noble metal supported by an oxide carrier, under oxidation atmosphere, the noble metal is on the surface of the carrier in higher oxidation state and also the noble metal has a surface oxide layer which is formed by binding with an cation of the carrier through oxygen of the surface of the carrier, and also under reduction atmosphere, wherein the noble metal is on the surface of the carrier in a metallic state and also the ratio of an amount of the noble metal exposed on the surface of the carrier, which is measured by the CO chemical adsorption method, is 10% or more by atomic ratio for the total amount of the noble metal supported by the carrier. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种废气清洁催化剂，其可以完全控制贵金属颗粒的聚集，以便即使暴露于高的废气也能够长时间地控制贵金属颗粒的生长温度长时间并且在短时间内重新分配贵金属的颗粒，以便即使在使用中生长颗粒时在相对低的温度范围内也容易再生催化剂活性。解决方案：废气清洁催化剂具有由氧化物载体担载的贵金属，在氧化气氛下，贵金属处于较高氧化态的载体表面，贵金属也具有表面氧化层，是通过载体表面的氧和还原气氛与载体的阳离子结合形成的，其中贵金属处于金属状态的载体表面上，还有贵金属的量的比例通过CO化学吸附法测定的载体表面露出的金属，由载体负载的贵金属的总量的原子比为10％以上。版权所有（C）2008，JPO＆INPIT

9. 发明专利

JP2007268460A Metal oxide catalyst carrier particle, and exhaust gas purification catalyst 审中-公开
标题翻译：金属氧化物催化剂载体颗粒和排气净化催化剂
公开(公告)号：JP2007268460A
公开(公告)日：2007-10-18
申请号：JP2006098730
申请日：2006-03-31
申请人： Toyota Central Res & Dev Lab Inc , Toyota Motor Corp , トヨタ自動車株式会社 , 株式会社豊田中央研究所
发明人： MIURA MASAHIDE , TAKAGI NOBUYUKI , MATSUMOTO SHINICHI , TANABE TOSHITAKA , NAGAI YASUTAKA , DOMAE KAZUHIKO , IKEDA YASUO
IPC分类号： B01J23/63 , B01D53/86 , B01D53/94 , B01J23/96 , B01J35/10 , B01J37/03 , B01J37/08 , B01J37/16 , B01J38/12 , F01N3/10
CPC分类号： B01J37/0221 , B01D53/945 , B01D2255/206 , B01J23/63 , B01J35/008 , B01J35/026 , B01J35/10 , B01J35/1014 , B01J37/0234 , Y02T10/22 , Y10T428/2991
摘要： PROBLEM TO BE SOLVED: To provide an exhaust gas purification catalyst enabling a good redistribution processing of platinum, a platinum redistribution processing method by such the exhaust gas purification catalyst, and a metal oxide catalyst carrier particle capable of obtaining such the exhaust gas purification catalyst and its manufacturing method. SOLUTION: The metal oxide catalyst carrier particle contains a first and a second metal oxides, and has different compositions in the central portion and the outer coat portion. In the metal oxide catalyst carrier particle, the mol fraction of a metal constituting the first metal oxide in the central portion is higher than that of the metal constituting the first metal oxide in the outer coat portion and the mol fraction of a metal constituting the second metal oxide in the outer coat portion is higher than that of the metal constituting the second metal oxide in the central portion, and the second metal oxide is selected from a group consisting of oxides of alkaline earth metals and rare earths excluding ceria. The exhaust gas purification catalyst comprises the metal oxide catalyst carrier particle supporting platinum. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：为了提供能够进行铂的良好再分配处理的废气净化催化剂，通过这种废气净化催化剂的铂再分配处理方法和能够获得这样的废气的金属氧化物催化剂载体颗粒净化催化剂及其制备方法。解决方案：金属氧化物催化剂载体颗粒包含第一和第二金属氧化物，并且在中心部分和外涂层部分中具有不同的组成。在金属氧化物催化剂载体颗粒中，构成中心部分的第一金属氧化物的金属的摩尔分数高于外涂层中构成第一金属氧化物的金属的摩尔分数，构成第二金属的金属的摩尔分数外涂层部分中的金属氧化物比构成中心部分的第二金属氧化物的金属高，第二金属氧化物选自碱土金属和除二氧化铈以外的稀土的氧化物。排气净化催化剂包含负载铂的金属氧化物催化剂载体颗粒。版权所有（C）2008，JPO＆INPIT

10. 发明专利

JP2003246624A METHOD OF PRODUCING PYROCHLORE TYPE OXIDE 审中-公开
公开(公告)号：JP2003246624A
公开(公告)日：2003-09-02
申请号：JP2002048353
申请日：2002-02-25
申请人： TOYOTA MOTOR CORP , TOYOTA CENTRAL RES & DEV
发明人： KUNO HISASHI , TAMURA HIROSHI , MATSUNAGA SHINICHI , TANABE TOSHITAKA
IPC分类号： F01N3/10 , B01D53/86 , B01D53/94 , B01J23/63 , B01J37/16 , C01G55/00
摘要： PROBLEM TO BE SOLVED: To provide a method of producing a pyrochlore type oxide which has a high value of OSC (oxygen storage capacity) at a low cost. SOLUTION: A mixed solution of a cerium compound, a zirconium compound and a noble metal compound is prepared, and, from the mixed solution, a solid substance containing cerium, zirconium and a noble metal is prepared. Next, the solid substance is fired in a reducing atmosphere to produce the pyrochlore type oxide. In an another embodiment, a reducing agent is added to the above mixed solution, and after that, a solid substance is prepared. Next, the solid substance is fired in a nonoxidizing atmosphere to produce the pyrochlore type oxide. The reducing agent is preferably selected from the group consisting of sodium borohydride, hydrazine, citric acid and formic acid. COPYRIGHT: (C)2003,JPO

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