Patent US4680282A successfully refreshed from Google Patents.
US4680282A
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Pollution control catalyst for internal combustion engine exhaust gases and process for producing it
Assignee: PRO-CATALYSE 1-4 AVENUE DE BOIS PREAU - 92500 - RUEIL MALMAISON - FRANCE
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Filing: 1985-07-30
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Granted: 1987-07-14
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Expires: 2005-07-30
Abstract
Abstract A multifunctional pollution control catalyst for the treatment of exhaust gases from internal combustion engines is comprised of a catalyst support having an active catalytic phase deposited thereon, said active catalytic phase comprising catalytically effective amounts of (i) zirconium, (ii) cerium, (iii) palladium, (iv) iridium and/or rhodium, and, optionally, (v) iron.
Inventors
- 👤 Gilbert Blanchard
- 👤 Michel Prigent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:10
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/70; B01J23/89; B01J23/8933; B01J23/894; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J23/63
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
121 words
A catalyst adapted for the treatment of internal combustion engine exhaust gases, which comprises (1) a support having (2) an active catalytic phase deposited thereon, said active catalytic phase comprising catalytically effective amounts of (i) zirconium, (ii) cerium, (iii) palladium, and (iv) at least one of the metals iridium and rhodium, said catalyst being produced by a process comprising (i) coating said support with a mixture of an alumina binder and an alumina filler, (ii) drying and calcinating said coated support, (iii) depositing cerium and zirconium on the support resulting from step (ii), (iv) drying and calcinating the support, (v) depositing palladium and iridium and/or rhodium on the carrier resulting from step (iv), and (vi) drying and calcinating the deposited carrier.
Claim 2
Dependent Claim
121 words
A catalyst adapted for the treatment of internal combustion engine exhaust gases, which comprises (1) a support having (2) an active catalytic phase deposited thereon, said active catalytic phase comprising catalytically effective amounts of (i) zirconium, (ii) cerium, (iii) palladium, and (iv) at least one of the metals iridium and rhodium, said catalyst being produced by a process comprising (i) coating said support with a mixture of an alumina binder and an alumina filler, (ii) drying and calcinating said coated support, (iii) depositing cerium and zirconium on the support resulting from step (ii), (iv) drying and calcinating the support, (v) depositing palladium and iridium and/or rhodium on the carrier resulting from step (iv), and (vi) drying and calcinating the deposited carrier.
Claim 3
Dependent Claim
21 words
The catalyst of claim 1, said active catalytic phase further comprising a catalytically effective amount of iron added during step (iii).
Claim 4
Dependent Claim
17 words
The catalyst of claim 1 or 2, comprising from about 0.04 to 3% by weight of palladium.
Claim 5
Dependent Claim
15 words
The catalyst of claim 3, comprising from about 0.05 to 0.50% by weight of palladium.
Claim 6
Dependent Claim
17 words
The catalyst of claim 3, comprising from about 0.002 to 0.3% by weight of iridium and/or rhodium.
Claim 7
Dependent Claim
17 words
The catalyst of claim 5, comprising from about 0.005 to 0.1% by weight of iridium and/or rhodium.
Claim 8
Dependent Claim
15 words
The catalyst of claim 5, comprising from about 0.1 to 10% by weight of cerium.
Claim 9
Dependent Claim
15 words
The catalyst of claim 7, comprising from about 0.3 to 5.0% by weight of cerium.
Claim 10
Dependent Claim
15 words
The catalyst of claim 7, comprising from about 0.1 to 10% by weight of zirconium.
Claim 11
Dependent Claim
15 words
The catalyst of claim 9, comprising from about 0.1 to 6% by weight of zirconium.
Claim 12
Dependent Claim
19 words
The catalyst of claim 1 or 2, wherein said active catalytic phase (2) is impregnated onto said support (1).
Claim 13
Dependent Claim
14 words
The catalyst of claim 1 or 2, said support (1) comprising a refractory oxide.
Claim 14
Dependent Claim
11 words
The catalyst of claim 12, said support (1) comprising alumina particulates.
Claim 15
Dependent Claim
58 words
The catalyst of claim 13, said alumina particulates having a specific surface area ranging from 25 to 250 m 2 /g, a total pore volume ranging from 0.5 to 2 cm 3 /g, and a macroporosity such that the pore volume of pores having a diameter greater than 1000 A ranges from 0.05 to 0.6 cm 3 /g.
Claim 16
Dependent Claim
40 words
The catalyst of claim 14, said specific surface area ranging from 70 to 150 m 2 /g, said total pore volume ranging from 0.8 to 1.7 cm 3 /g, and said macroporosity ranging from 0.2 to 0.5 cm 3 /h.
Claim 17
Dependent Claim
21 words
The catalyst of claim 1 or 2, said support (1) comprising a metal or ceramic substrate coated with a refractory oxide.
Claim 18
Dependent Claim
11 words
The catalyst of claim 16, said refractory oxide comprising aluminum oxide.
Claim 19
Dependent Claim
12 words
The catalyst of claim 16, said substrate comprising an open network monolith.
Claim 20
Dependent Claim
28 words
The catalyst of claims 1 or 2, adapted to absorb at least 60% of the theoretical amount of carbon monoxide after aging for 100 hours at 850° C.
Claim 21
Dependent Claim
16 words
The catalyst of claims 1 or 2, said active catalytic phase comprising both palladium and rhodium.
Claim 22
Dependent Claim
74 words
A process for producing a catalyst comprising (i) providing a support, (ii) coating said support with a mixture of an alumina binder and an alumina filler, (iii) drying and calcining said coated support, (iv) depositing cerium and zirconium on the support resulting from step (iii), (v) drying and calcining the deposited support, (vi) depositing palladium and iridium and/or rhodium on the support resulting from step (v), and (vii) drying and calcining the deposited support.
Claim 23
Dependent Claim
74 words
A process for producing a catalyst comprising (i) providing a support, (ii) coating said support with a mixture of an alumina binder and an alumina filler, (iii) drying and calcining said coated support, (iv) depositing cerium and zirconium on the support resulting from step (iii), (v) drying and calcining the deposited support, (vi) depositing palladium and iridium and/or rhodium on the support resulting from step (v), and (vii) drying and calcining the deposited support.
Claim 24
Dependent Claim
17 words
The process of claim 21, further comprising depositing during step (iv) a catalytically effective amount of iron.
Claim 25
Dependent Claim
14 words
The process of claim 21, wherein said depositing steps comprise impregnation onto said support.
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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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |