Niobate-based octahedral molecular sieves

Details Niobate-based octahedral molecular sieves Niobate-based octahedral molecular sieves

2006-10-17

2006-10-17

Bos, Steven (Department: 1754)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

C423S054000, C423S089000, C423S100000, C423S139000, C423S157000, C423S181000, C210S681000, C210S687000, C210S688000

Reexamination Certificate

active

07122164

ABSTRACT:
Niobate-based octahedral molecular sieves having significant activity for multivalent cations and a method for synthesizing such sieves are disclosed. The sieves have a net negatively charged octahedral framework, comprising niobium, oxygen, and octahedrally coordinated lower valence transition metals. The framework can be charge balanced by the occluded alkali cation from the synthesis method. The alkali cation can be exchanged for other contaminant metal ions. The ion-exchanged niobate-based octahedral molecular sieve can be backexchanged in acidic solutions to yield a solution concentrated in the contaminant metal. Alternatively, the ion-exchanged niobate-based octahedral molecular sieve can be thermally converted to a durable perovskite phase waste form.

REFERENCES:
patent: 5208006 (1993-05-01), Kuznicki et al.
patent: 5667695 (1997-09-01), Bedard et al.
patent: 6379557 (2002-04-01), Bedard

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