US4689316A
Expired / Lapsed
US
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Method of preparing supported catalysts
Assignee: Dow Chemical Co
•
Filing: 1986-02-04
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Granted: 1987-08-25
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Expires: 2006-02-04
Abstract
Abstract Metal vapor may be deposited on catalyst supports to produce supported catalysts. This process allows deposition deep in the pores of the catalyst support without the impregnation problems of liquid phase deposition of catalytic material on porous catalyst supports.
Inventors
- 👤 Robert G. Bowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:20
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/66; B01J23/48; B01J23/50; B01J37/00; B01J37/02; B01J37/0238; B01J37/30; B01J21/00; B01J21/06; B01J21/08
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
103 words
A process for forming a supported metal catalyst comprising: (a) generating metallic vapor by heating zero valent metal to a temperature sufficient to generate at least about 0.25 atmospheres of metallic vapor; (b) contacting the metallic vapor with a support under conditions sufficient to deposit the metallic vapor onto the support thereby forming a first supported metal, providing the heated zero valent metal is not in contact with the support; and (c) contacting the first supported metal with a solution containing silver ions which will electrodeposit on the support, thereby liberating ions of the first supported metal and forming a supported silver catalyst.
Claim 2
Dependent Claim
103 words
A process for forming a supported metal catalyst comprising: (a) generating metallic vapor by heating zero valent metal to a temperature sufficient to generate at least about 0.25 atmospheres of metallic vapor; (b) contacting the metallic vapor with a support under conditions sufficient to deposit the metallic vapor onto the support thereby forming a first supported metal, providing the heated zero valent metal is not in contact with the support; and (c) contacting the first supported metal with a solution containing silver ions which will electrodeposit on the support, thereby liberating ions of the first supported metal and forming a supported silver catalyst.
Claim 3
Dependent Claim
29 words
The process of claim 1 in which the zero valent metal produces a metallic vapor having a condensation temperature below about 2000 K., or a mixture of such metals.
Claim 4
Dependent Claim
14 words
The process of claim 2 in which only one zero valent metal is used.
Claim 5
Dependent Claim
25 words
The process of claim 3 in which the zero valent metal is selected from the group consisting of sodium, potassium, lithium, zinc, cadmium and magnesium.
Claim 6
Dependent Claim
13 words
The process of claim 4 in which the zero valent metal is zinc.
Claim 7
Dependent Claim
18 words
The process of claim 1 in which the first supported metal is zinc and the support is silica.
Claim 8
Dependent Claim
21 words
The process of claim 1 in which the contact of the metallic vapor with the support is with the diffusion method.
Claim 9
Dependent Claim
21 words
The process of claim 1 in which the contact of the metallic vapor with the support is with the carrier-assisted method.
Claim 10
Dependent Claim
31 words
The process of claim 1 in which the catalyst support is SiO 2 , SiC, TiO 2 , TaTiO 3 , Al 2 O 3 , carbon black or a zeolite.
Claim 11
Dependent Claim
14 words
The process of claim 9 in which the catalyst support is SiO 2 .
Claim 12
Dependent Claim
23 words
The process of claim 1 in which the supported catalyst has a loading between about 0.05 weight percent and about 40 weight percent.
Claim 13
Dependent Claim
23 words
The process of claim 11 in which the supported catalyst has a loading between about 0.1 weight percent and about 10 weight percent.
Claim 14
Dependent Claim
23 words
The process of claim 1 in which the supported catalyst has an average particle size between about 0.15 mm and about 15 mm.
Claim 15
Dependent Claim
27 words
The process of claim 8 in which the metallic vapor comprises between a mole fraction of about 0.001 and about 1.0 of the carrier gas-metallic vapor stream.
Claim 16
Dependent Claim
23 words
The process of claim 1 in which the support has a porosity between about 0.01 cc/g and about 3.5 cc/g of a support.
Claim 17
Dependent Claim
40 words
The process of claim 8 in which the temperature is between about 100° C. and about 1500° C. and the space velocity of carrier gas through the support is between about 0.03 hr -1 and about 3,000 hr -1 .
Claim 18
Dependent Claim
27 words
The process of claim 1 in which the catalyst support has an average BET surface area between 0.01 m 2 /g. and about 700 m 2 /g.
Claim 19
Dependent Claim
9 words
The catalyst formed by the process of claim 1.
Claim 20
Dependent Claim
17 words
The catalyst of claim 18 wherein the first supported metal is zinc and the support is silica.
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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) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |