Chemistry of inorganic compounds – Rare earth compound
Reexamination Certificate
2011-05-10
2011-05-10
Vanoy, Timothy C (Department: 1736)
Chemistry of inorganic compounds
Rare earth compound
C423S593100, C423S594120, C423S600000, C423S608000, C502S300000, C502S302000, C502S304000, C502S308000, C502S355000
Reexamination Certificate
active
07939041
ABSTRACT:
An improved method for the formation of composite hydroxides or oxides comprising, on an oxide basis, Al2O3and ZrO2, and optionally CeO2, La2O3, Nd2O3, Pr6O11, Sm2O3, Y2O3, and other rare earth oxides, comprising the steps of preparing an aqueous metal salt solution and forming a hydroxide precipitate slurry by combining the aqueous metal salt solution with an aqueous solution of a caustic alkali at a pH greater than 8.5 to precipitate out all the metal species. The variation in pH during the precipitation reaction is ±1. The invention also relates to composites formed by this method comprising 20-70 wt % Al2O3, 10-77 wt % ZrO2, 0-34 wt % CeO2and 0-22 wt % REOs other than CeO2, and to composites per se comprising, on an oxide basis, 42-70 wt % Al2O3, 10-48 wt % ZrO2, 2-34 wt % CeO2and 0-9 wt % REOs other than CeO2and having the following properties after heating to 850° C. over four hours and holding at 850° C. for four hours then allowing to cool to ambient temperature: —a surface area after aging at 950° C. for 2 hours equal to or greater than 60 m2/g, and —a surface area after aging at 1100° C. for 2 hours equal to or greater than 30 m2/g.
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Liao Diana J
Magnesium Elektron Limited
Pearne & Gordon LLP
Vanoy Timothy C
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