Preparation of complex metal oxides

Details Preparation of complex metal oxides Preparation of complex metal oxides

2011-03-01

2011-03-01

Bos, Steven (Department: 1736)

Chemistry of inorganic compounds

Rare earth compound

C423S593100, C423S594200, C423S594400, C423S594600, C423S594800, C423S595000, C423S599000

Reexamination Certificate

active

07897128

ABSTRACT:
The present invention provides a process for making a complex metal oxide comprising the formula AxByOz. The process comprises the steps of: (a) reacting in solution at a temperature of between about 75° C. to about 100° C. at least one water-soluble salt of A, at least one water-soluble salt of B and a stoichiometric amount of a carbonate salt or a bicarbonate salt required to form a mole of a carbonate precipitate represented by the formula AxBy(CO3)n, wherein the reacting is conducted in a substantial absence of carbon dioxide to form the carbonate precipitate and wherein the molar amount of carbonate salt or bicarbonate salt is at least three times the stoichiometric amount of carbonate or bicarbonate salt required to form a mole of the carbonate precipitate; and (b) reacting the carbonate precipitate with an oxygen containing fluid under conditions to form the complex metal oxide.

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