Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Silicon containing or process of making
Reexamination Certificate
2005-08-23
2005-08-23
Langel, Wayne A. (Department: 1754)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Silicon containing or process of making
C423S263000, C423S326000, C423S327100, C423S331000, C423S593100, C423S598000, C423S600000, C423S594120, C423S594160, C502S242000, C502S261000, C502S262000, C502S263000, C502S300000, C502S302000, C502S303000, C502S304000, C502S340000, C502S341000, C502S349000, C502S350000, C502S351000
Reexamination Certificate
active
06933259
ABSTRACT:
This composite oxide powder can secure a large pore volume even after calcination at high temperature and, when a catalyst is formed by loading a noble metal on this composite oxide powder, noble metal grain growth can be suppressed. The composite oxide powder comprises particles of an oxide of a metal M1and an oxide of a metal M2which does not dissolve in the oxide of the metal M1, the oxide of the metal M1and the oxide of the metal M2being dispersed at the nanometer level. Since different oxides serve as a barrier to each other, sintering is suppressed. Therefore, in the case of composite oxide powder comprising Ce as a metal M1and Al as a metal M2, grain growth is small even after exposed to high temperature and pores of 3.5-100 nm secure a volume of 0.07 cc/g or more after calcination at 600° C. for 5 hours and a volume of 0.04 cc/g or more after calcination at 800° C. for 5 hours.
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Hatanaka Miho
Morikawa Akira
Sobukawa Hideo
Suda Akihiko
Yamazaki Kiyoshi
Kabushiki Kaisha Toyota Chuo Kenkyusho
Langel Wayne A.
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