US4425261A
Expired / Lapsed
US
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Liquid suspension of particles of a metal belonging to the platinum group and a method for the manufacture of such a suspension
Assignee: YTKEMISKA INSTITUTET BOX 5607 S 114 86 STOCKHOLM SWEDEN AN INSTITUTION OF SWEDEN
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Filing: 1981-03-20
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Granted: 1984-01-10
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Expires: 2001-03-20
Abstract
Abstract A stable suspension of particles of a metal belonging to the platinum group consists of a microemulsion in which the particles are suspended. The suspension is prepared by dissolving a metal salt in a microemulsion, and reducing the salt to form a metal.
Inventors
- 👤 Per Stenius
- 👤 Jerzy Kizling
- 👤 Magali Boutonnet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:50
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/54; B01J23/56; B01J23/62; B01J23/622; B01J23/628; B01J35/00; B01J35/40; B01J35/45; C; C22; C22B; C22B11/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
40 words
A liquid suspension of particles of a metal belonging to the platinum group, characterized in that the liquid comprises a microemulsion and that the size of the metal particles does not deviate from the average by more than about 10%.
Claim 2
Dependent Claim
40 words
A liquid suspension of particles of a metal belonging to the platinum group, characterized in that the liquid comprises a microemulsion and that the size of the metal particles does not deviate from the average by more than about 10%.
Claim 3
Dependent Claim
20 words
A suspension as claimed in claim 1, characterized in that the microemulsion comprises a hydrocarbon, a non-ionic surfactant, and water.
Claim 4
Dependent Claim
19 words
A suspension as claimed in claim 1, characterized in that the metal particles have a size of 2-5 nm.
Claim 5
Dependent Claim
18 words
A suspension as claimed in claim 1, characterized in that the metal particles each comprise a single crystal.
Claim 6
Dependent Claim
41 words
A suspension as claimed in claim 1, in which the microemulsion comprises n-hexane, pentaethyleneglycol dodecylether, and water, characterized in that the composition of the microemulsion is represented by the shaded area in any of the ternary diagrams disclosed in the drawing.
Claim 7
Independent Claim
67 words
A method for the manufacture of a liquid suspension of particles of a metal belonging to the platinum group by reducing a metal salt in an aqueous solution, characterized in dissolving the metal salt in a microemulsion, and reducing the dissolved metal salt to the metallic state to thereby provide metal particles of a size which does not deviate from the average by more than about 10%.
Claim 8
Independent Claim
67 words
A method for the manufacture of a liquid suspension of particles of a metal belonging to the platinum group by reducing a metal salt in an aqueous solution, characterized in dissolving the metal salt in a microemulsion, and reducing the dissolved metal salt to the metallic state to thereby provide metal particles of a size which does not deviate from the average by more than about 10%.
Claim 9
Dependent Claim
24 words
A method as claimed in claim 6, characterized in dissolving the metal salt in a microemulsion comprising a hydrocarbon, a non-ionic surfactant, and water.
Claim 10
Dependent Claim
17 words
A method as claimed in claim 6, characterized in reducing the metal salt with hydrogen or hydrazine.
Claim 11
Dependent Claim
38 words
A method as claimed in claim 6, in which acid by-products are formed in the reaction, characterized in giving the microemulsion, before the reduction, such as increased pH that the pH after the reduction is at least 4.
Claim 12
Dependent Claim
45 words
A process for preparing a catalyst using the suspension of particles of claim 1, comprising the steps of (1) wetting a carrier with the suspension of particles comprising the microemulsion, and then (2) evaporating the liquid so as to deposit the particles on the carrier.
References Cited (Backward Citations)
US3835066A
Cited
US3992331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |