Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2007-05-08
2007-05-08
Sample, David (Department: 1755)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
C502S304000, C502S349000, C502S527140, C502S527240, C501S103000, C423S592100, C423S594200, C423S608000
Reexamination Certificate
active
10393068
ABSTRACT:
A metal oxide which has a large pore volume, and is very useful as a catalyst support. An alkaline material is added to an aqueous solution in which a compound of a metal element for composing an oxide is dissolved, a resultant mixture is co-precipitated, an obtained precipitate is washed, a washed precipitate is stirred in water along with a surfactant, and is calcined. By adding the surfactant after washing, the pH is not changed so that the adding effect of the surfactant is achieved to its upper most limit, thereby obtaining a metal oxide which has a large pore volume and a large mean diameter of secondary particles, and exhibits excellent gas diffusion properties.
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Y. Nagai, et al. Catalysis Today, vol. 74, pp. 225-234, “X-ray Absorption Fine Stucture Analysis of Local Structure of CeO2−ZrO2Mixed Oxides With the Same Composition Ratio (Ce/Zr=1)”, 2002, no month.
Sobukawa Hideo
Suda Akihiko
Yamamoto Toshio
Yamamura Kae
Hailey Patricia L.
Kabushiki Kaisha Toyota Chuo Kenkyusho
Sample David
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