US4492769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pollution control catalyst for internal combustion engine exhaust system/catalytic converter and process for its preparation
Assignee: Pro Catalyse SA
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Filing: 1983-07-25
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Granted: 1985-01-08
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Expires: 2003-07-25
Abstract
Abstract A pollution control catalyst for a catalytic converter within the exhaust system of an internal combustion engine is facilely prepared by (i) coating/impregnating a catalyst support with palladium and at least one base metal catalyst, (ii) activating the step (i) catalyst, (iii) next coating/impregnating the step (ii) activated catalyst with at least one platinum group precious metal other than palladium, or combination of palladium and at least one other platinum group precious metal, and (iv) then activating the step (iii) catalyst.
Inventors
- 👤 Gilbert Blanchard
- 👤 Jean-Pierre Brunelle
- 👤 Michel Prigent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:23
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/70; B01J23/89; B01J23/8933; B01J23/8946; B01J23/8986; B01J37/00; B01J37/02; B01J37/0201; B01J37/0205; B01J37/024; B01J37/0244; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
105 words
A process for the preparation of a catalyst composition adopted for the treatment of internal combustion engine exhaust gases, comprising (i) coating and/or impregnating a support with a catalyst of palladium and at least one base metal element, (ii) activating the step (i) catalyst at a temperature ranging from 120° to 800° C., (iii) next coating and/or impregnating the step (ii) activated catalyst with at least one platinum group precious metal other than palladium, or a combination of palladium and at least one other platinum group precious metal, and (iv) thence activating the step (iii) catalyst at a temperature ranging from 300° to 800° C.
Claim 2
Dependent Claim
105 words
A process for the preparation of a catalyst composition adopted for the treatment of internal combustion engine exhaust gases, comprising (i) coating and/or impregnating a support with a catalyst of palladium and at least one base metal element, (ii) activating the step (i) catalyst at a temperature ranging from 120° to 800° C., (iii) next coating and/or impregnating the step (ii) activated catalyst with at least one platinum group precious metal other than palladium, or a combination of palladium and at least one other platinum group precious metal, and (iv) thence activating the step (iii) catalyst at a temperature ranging from 300° to 800° C.
Claim 3
Dependent Claim
18 words
The process as defined by claim 1, said platinum group precious metal comprising platinum, rhodium, ruthenium and iridium.
Claim 4
Dependent Claim
17 words
The process as defined by claim 2, said platinum group precious metal comprising platinum, iridium and rhodium.
Claim 5
Dependent Claim
38 words
The process as defined by claim 2, said at least one base metal element comprising cobalt, zinc, manganese, nickel, tungsten, cerium, iron, copper, neodymium, praseodymium, rhenium, chromium, zirconium, lanthanum, tin, calcium, strontium, barium, yttrium, magnesium, titanium and gallium.
Claim 6
Dependent Claim
44 words
The process as defined by claim 4, said at least one base metal element comprising (a) iron and/or cerium, (b) manganese and cerium and/or iron, (c) cerium, iron, gallium and/or yttrium, (d) cerium, iron, barium and/or magnesium and/or yttrium, and (e) lanthanum and/or neodymium.
Claim 7
Dependent Claim
30 words
The process as defined by claim 1, comprising carrying out said step (i) by immersing said support in a solution which comprises compounds of palladium and of the base metal.
Claim 8
Dependent Claim
15 words
The process as defined by claim 1, comprising carrying out said step (i) by co-gelation.
Claim 9
Dependent Claim
15 words
The process as defined by claim 1, comprising carrying out said step (i) by co-precipitation.
Claim 10
Dependent Claim
19 words
The process as defined by claim 6, said compounds of palladium comprising palladium chloride, palladium nitrate and tetraamminopalladium(II) dichloride.
Claim 11
Dependent Claim
18 words
The process as defined by claim 1, said activating step (iv) being carried out under a reducing atmosphere.
Claim 12
Dependent Claim
19 words
The process as defined by claim 1, said catalyst support comprising particulates of silica, alumina, aluminosilicate or mixed oxides.
Claim 13
Dependent Claim
15 words
The process as defined by claim 1, said catalyst support comprising an oxide-coated metallic substrate.
Claim 14
Dependent Claim
15 words
The process as defined by claim 1, said catalyst support comprising an oxide-coated ceramic substrate.
Claim 15
Dependent Claim
13 words
The process as defined by claim 1, said catalyst support comprising a honeycomb.
Claim 16
Dependent Claim
33 words
The process as defined by claim 1, said product catalyst composition comprising a total amount of platinum group metal ranging from 0.02 to 0.5% by weight, based upon the weight of the support.
Claim 17
Dependent Claim
32 words
The process as defined by claim 15, said product catalyst composition comprising a total amount of base metal ranging from 0.1 to 11% by weight, based upon the weight of the support.
Claim 18
Dependent Claim
12 words
The catalyst composition prepared by the process as defined by claim 1.
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) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |