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US4606847A
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Process for the preparation of a dispersable product containing a cerium compound in association with a selected metal
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1985-10-24
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Granted: 1986-08-19
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Expires: 2005-10-24
Abstract
Abstract The present invention relates to compounds and more particularly to cerium compounds and cerium compounds in association with other elements. The invention provides a process for the preparation of a dispersible product containing a cerium compound which comprises heating a cerium (IV) oxide hydrate in the presence of a salt to cause deaggregation of aggregated crystallites in the cerium (IV) oxide hydrate and produce a dispersible product containing a cerium compound. The salt may be chosen such that a selected chemical element is present in the dispersible product.
Inventors
- 👤 James L. Woodhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:11
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0004; B01J13/0047; C; C01; C01F; C01F17/00; C01F17/20; C01F17/206; C01F17/224; C01F17/235; C01F17/241; C01F17/253; C01F17/271; C01F17/276; C01F17/30; C01F17/32; C01P; C01P2006/00; C01P2006/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
A process for the preparation of a dry dispersible product containing ceria and at least one metal oxide, dispersible in an aqueous media to give a mixed metal oxide colloidal dispersion of said ceria and at least 10 weight percent metal oxide comprising adding an aqueous solution of a metal salt selected from the group consisting of yttrium salt and rare earth metal nitrate, chloride or perchlorate to dry cerium IV oxide hydrate and heating the resulting mixture at a temperature of 200° C. to 450° C. for a time sufficient to effect deaggregation of aggregated crystallites in said cerium oxide hydrate and provide said dry dispersible product.
Claim 2
Dependent Claim
108 words
A process for the preparation of a dry dispersible product containing ceria and at least one metal oxide, dispersible in an aqueous media to give a mixed metal oxide colloidal dispersion of said ceria and at least 10 weight percent metal oxide comprising adding an aqueous solution of a metal salt selected from the group consisting of yttrium salt and rare earth metal nitrate, chloride or perchlorate to dry cerium IV oxide hydrate and heating the resulting mixture at a temperature of 200° C. to 450° C. for a time sufficient to effect deaggregation of aggregated crystallites in said cerium oxide hydrate and provide said dry dispersible product.
Claim 3
Dependent Claim
23 words
A process as claimed in claim 1 wherein a cerium (IV) oxide hydrate is heated in the presence of a plurality of salts.
Claim 4
Dependent Claim
32 words
A process as claimed in claim 1 wherein dry cerium (IV) oxide hydrate is heated in the presence of said salt at a temperature in the range 200° C. to 450° C.
Claim 5
Dependent Claim
36 words
A process for the preparation of a colloidal dispersion containing a cerium compound which comprises dispersing in an aqueous medium a dispersible product containing a cerium compound prepared by a process as claimed in claim 1.
Claim 6
Dependent Claim
39 words
A process for the preparation of a gel which comprises drying a sol which has been prepared by dispersing in an aqueous medium a dispersible product containing a cerium compound prepared by a process as claimed in claim 1.
Claim 7
Dependent Claim
64 words
A process for the preparation of a colloidal dispersion containing a cerium compound which comprises mixing a dispersible product prepared by a process as claimed in claim 1 with water at such a concentration that coagulation occurs to form a slurry, separating the solids of the slurry from liquor of the slurry and dispersing the separated solids in water to form a colloidal dispersion.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |