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US3767453A
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US
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Method of depositing a high surface area alumina film on a relatively low surface area support
Assignee: Universal Oil Products Co
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Filing: 1971-06-30
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Granted: 1973-10-23
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Expires: 1991-06-30
Abstract
Abstract A relatively low surface area honeycomb-type ceramic support is impregnated with an alumina sol containing as a soluble plasticizer at least about 5 wt. percent of a polyethylene glycol having an average molecular weight from about 200 to about 3000. The support is thereafter calcined to form a uniformly thin, high surface area alumina film thereon.
Inventors
- 👤 J Hoekstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:54
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/024; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J21/00; B01J21/02; B01J21/04; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
The method of claim 1 further characterized in that said refractory support is a ceramic honeycomb structure of cordierite.
Claim 2
Dependent Claim
34 words
The method of claim 1 further characterized in that said alumina sol is prepared by effecting a reduction in the acid anion concentration of an aqueous solution of a hydrolyzable acid salt of aluminum.
Claim 3
Dependent Claim
34 words
The method of claim 1 further characterized in that said alumina sol is an aluminum chloride sol prepared by effecting a reduction in the chloride anion concentration of an aqueous solution of aluminum chloride.
Claim 4
Dependent Claim
46 words
The method of claim 1 further characterized in that said alumina sol is an aluminum chloride sol prepared by effecting a reduction in the chloride anion concentration of an aqueous solution of aluminum chloride to provide an aluminum/chloride ratio of from about 1:1 to about 2:1.
Claim 5
Dependent Claim
23 words
The method of claim 1 further characterized in that said sol contains from about 10 to about 20 wt. percent of said plasticizer.
Claim 6
Dependent Claim
39 words
The method of claim 1 further charActerized in that said sol further contains from about 0.05 to about 0.5 wt. percent of a polyoxyethylene alcohol surfactant characterized by an average molecular weight of from about 200 to about 500.
Claim 7
Dependent Claim
24 words
The method of claim 1 further characterized in that said impregnated support is calcined at a temperature of from about 425* to about 1,100*C.
Claim 8
Dependent Claim
16 words
THE SUPPORT IS THEREAFTER CALCINED TO FORM A UNIFORMLY THIN, HIGH SURFACE AREA ALUMINA FILM THEREON.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |