US5130110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for obtaining refractory metal oxides based on silica by sol-gel route in aqueous medium
Assignee: Sanofi Aventis France
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Filing: 1990-12-18
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Granted: 1992-07-14
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Expires: 2010-12-18
Abstract
Abstract Process for obtaining by sol-gel route refractory metal oxides based on silica in which a monolithic gel is prepared, in an aqueous medium, at a temperature of less than 60° C., by leaving at rest an aqueous sol obtained by simple mixing in stoichiometric quantities of an aqueous sol of silicic acid and of one or more aqueous solutions of a water-soluble salt of one or more other constitutive metals of these oxides, then the monolithic gel obtained is calcined at a temperature of less than 1000° C. after it has been dried at a temperature of less than 150° C.
Inventors
- 👤 Patrice Rouet
- 👤 Florence Syoen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:34
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B13/00; C01B13/14; C01B13/32; C01B33/26; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
Process for obtaining by sol-gel route refractory metal oxides based on silica, characterized in that a monolithic gel is prepared, in an aqueous medium, at a temperature of less than 60° C., by leaving at rest an aqueous sol obtained by simple mixing in stoichiometric quantities of an aqueous sol of silicic acid and of one or more aqueous solutions of a water-soluble salt of one or more other constitutive metals of these refractory metal oxides, then the monolithic gel obtained is calcined at a temperature of less than 1000° C. after it has been dried at a temperature of less than 150° C.
Claim 2
Dependent Claim
104 words
Process for obtaining by sol-gel route refractory metal oxides based on silica, characterized in that a monolithic gel is prepared, in an aqueous medium, at a temperature of less than 60° C., by leaving at rest an aqueous sol obtained by simple mixing in stoichiometric quantities of an aqueous sol of silicic acid and of one or more aqueous solutions of a water-soluble salt of one or more other constitutive metals of these refractory metal oxides, then the monolithic gel obtained is calcined at a temperature of less than 1000° C. after it has been dried at a temperature of less than 150° C.
Claim 3
Dependent Claim
102 words
A process for producing a silica-containing refractory metal oxide comprising: preparing an aqueous sol of silicic acid, preparing one or more aqueous solutions of water-soluble salts of metals; mixing a stoichiometric quantity of said aqueous sol of silicic acid and one or more aqueous solutions of said water soluble salts of metals to provide a mixture thereof; allowing the mixture to gel at a temperature of less than about 60° C., drying said gel at a temperature of less than about 150° C. and calcining said gel at a temperature of less than about 1000° C. to provide said silica-containing refractory oxide.
Claim 4
Dependent Claim
102 words
A process for producing a silica-containing refractory metal oxide comprising: preparing an aqueous sol of silicic acid, preparing one or more aqueous solutions of water-soluble salts of metals; mixing a stoichiometric quantity of said aqueous sol of silicic acid and one or more aqueous solutions of said water soluble salts of metals to provide a mixture thereof; allowing the mixture to gel at a temperature of less than about 60° C., drying said gel at a temperature of less than about 150° C. and calcining said gel at a temperature of less than about 1000° C. to provide said silica-containing refractory oxide.
Claim 5
Dependent Claim
23 words
The process of claim 2 wherein at least one of said metals is selected from the group consisting of aluminum, magnesium and zirconium.
Claim 6
Dependent Claim
14 words
The process of claim 2 wherein said water soluble salts of metals are nitrates.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |