US3957692A
Expired / Lapsed
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Method of preparing a catalyst
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1974-12-03
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Granted: 1976-05-18
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Expires: 1994-12-03
Abstract
Abstract A catalyst suitable, for example, for treatment of cat exhaust emissions is prepared by providing a substrate with a continuous adherent, surface layer of a carrier material for catalytic material by providing on the substrate a layer of carrier material, at least part of which comprises a gel, and firing; and sputtering catalytic material onto the surface layer by bombarding a source of the catalytic material in the neighbourhood of the surface layer with energetic ions, the conditions of atmosphere and selectivity of ions permitted to bombard the catalytic material being such that co-deposition upon the surface layer of unwanted material is avoided.
Inventors
- 👤 James Anthony Cairns
- 👤 Michael Joseph Holdoway
- 👤 Robert Livingston Nelson
- 👤 Richard Stuart Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:20
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J; B01J37/00; B01J37/02; B01J37/024; F; F01; F01N; F01N2330/00; F01N2330/30; F01N2330/40
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
57 words
A method of preparing a catalyst which comprises the steps of i. contacting a substrate with a sol of a refractory carrier material, drying to convert the sol to a gel, and firing, thereby to provide the substrate with a continuous adherent surface layer of the carrier material; and ii. sputtering catalytic material onto the surface layer.
Claim 2
Independent Claim
57 words
A method of preparing a catalyst which comprises the steps of i. contacting a substrate with a sol of a refractory carrier material, drying to convert the sol to a gel, and firing, thereby to provide the substrate with a continuous adherent surface layer of the carrier material; and ii. sputtering catalytic material onto the surface layer.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein the refractory carrier material is a refractory oxide.
Claim 4
Dependent Claim
22 words
A method according to claim 2 wherein the sol contains crystallites of diameter in the range from 3 nm to 100 nm.
Claim 5
Dependent Claim
15 words
A method according to claim 3 wherein the diameter of the crystallites is 10 nm.
Claim 6
Dependent Claim
43 words
A method according to claim 2 wherein the refractory oxide is alumina and the concentration of the sol is in the range equivalent to 1 g of alumina per 100 ml of water to 15 g of alumina per 100 ml of water.
Claim 7
Dependent Claim
24 words
A method according to claim 5 wherein the concentration of the sol is equivalent to 5 g of alumina per 100 ml of water.
Claim 8
Dependent Claim
14 words
A method according to claim 2 wherein the substrate comprises an aluminium-bearing ferritic alloy.
Claim 9
Dependent Claim
45 words
A method according to claim 7 wherein the aluminium bearing ferritic alloy comprises an alloy of iron, chromium, aluminium and yttrium with proportions by weight lying in the range up to 15% chromium, 0.5 to 12% aluminium, 0.1 to 3% yttrium, and the balance iron.
Claim 10
Dependent Claim
25 words
A method according to claim 7 wherein the catalytic material is a platinum group metal or an alloy of two or more platinum group metals.
Claim 11
Dependent Claim
12 words
A method according to claim 9 wherein the catalytic material is platinum.
Claim 12
Independent Claim
53 words
A method of preparing a catalyst support which comprises contacting a substrate comprising an aluminum-bearing ferritic alloy with a sol of a refractory carrier material for catalytic material, drying to convert the sol to a gel, and firing, thereby to provide the substrate with a continuous, adherent surface layer of the carrier material.
Claim 13
Independent Claim
53 words
A method of preparing a catalyst support which comprises contacting a substrate comprising an aluminum-bearing ferritic alloy with a sol of a refractory carrier material for catalytic material, drying to convert the sol to a gel, and firing, thereby to provide the substrate with a continuous, adherent surface layer of the carrier material.
Claim 14
Dependent Claim
22 words
A method according to claim 11 wherein the alloy has been oxidized to form an essentially alumina layer on the surface thereof.
Claim 15
Dependent Claim
42 words
A method according to claim 11 wherein the alloy comprises an alloy of iron, chromium, aluminium and yttrium with proportions by weight lying in the range up to 15% Cr, 0.5 to 12% Al, 0.1 to 3% Y, and the balance Fe.
Claim 16
Dependent Claim
15 words
A method according to claim 11 wherein the refractory carrier material is a refractory oxide.
Claim 17
Dependent Claim
12 words
A method according to claim 14 wherein the refractory oxide is alumina.
Claim 18
Dependent Claim
16 words
A method according to claim 15 wherein the refractory oxide comprises alumina in combination with yttria.
Claim 19
Dependent Claim
22 words
A method according to claim 11 wherein the dispersion contains crystallites of diameter in the range from 3 nm to 100 nm.
Claim 20
Dependent Claim
37 words
A method according to claim 15 wherein the concentration of the sol is in the range equivalent to 1 g of alumina per 100 ml of water to 15 g of alumina per 100 ml of water.
Claim 21
Dependent Claim
19 words
A method according to claim 11 wherein the firing takes place at a temperature of not less than 1100°C.
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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |