US4985387A
Expired / Lapsed
US
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Catalyst supports/catalysts for the treatment of vehicular exhaust gases
Assignee: Pro Catalyse SA
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Filing: 1989-03-16
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Granted: 1991-01-15
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Expires: 2009-03-16
Abstract
Abstract Thermally stable, sulfur-resistant catalysts for the conversion of exhaust gases from internal combustion engines includes an inert, rigid support substrate, e.g., a cellular monolith, coated with a layer of porouse material, the porous material containing alumina, at least one rare earth oxide, and a spinel type compound having a specific surface of at least 50 m 2 /g, and the support substrate having an effective amount of a catalytically active phase impregnated onto the porous coating thereof.
Inventors
- 👤 Michel Prigent
- 👤 Gilbert Blanchard
- 👤 Francois Garreau
- 👤 Philippe Courty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:23
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/005; B01J23/10; B01J23/38; B01J23/54; B01J23/56; B01J23/63; B01J23/70; B01J23/76; B01J23/83; B01J23/89; B01J23/8933; B01J23/894; B01J37/00; B01J37/02; B01J37/024; B01J37/0242; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S502/00; Y10S502/524
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
42 words
A catalyst support which comprises an inert, rigid substrate coated with a layer of porous material, said porous material comprising alumina, at least one rare earth oxide, and a spinel compound having a specific surface of at least 50 m 2/ g.
Claim 2
Dependent Claim
42 words
A catalyst support which comprises an inert, rigid substrate coated with a layer of porous material, said porous material comprising alumina, at least one rare earth oxide, and a spinel compound having a specific surface of at least 50 m 2/ g.
Claim 3
Dependent Claim
26 words
The catalyst support as defined by claim 1, said spinel compound having a specific surface ranging from 50 m 2/ g to 300 m 2/ g.
Claim 4
Dependent Claim
46 words
The catalyst support as defined by claim 1, said porous material comprising 15% to 40% by dry weight of said alumina, 1% to 25% by dry weight of said at least one rare earth oxide, and 35% to 84% by dry weight of said spinel compound.
Claim 5
Dependent Claim
22 words
The catalyst support as defined by claim 3, said porous material comprising 40% to 75% by dry weight of said spinel compound.
Claim 6
Dependent Claim
21 words
The catalyst support as defined by claim 3, said porous material comprising 20% to 40% by dry weight of activated alumina.
Claim 7
Dependent Claim
26 words
The catalyst support as defined by claim 3, said porous material comprising 5% to 20% by dry weight of said at least one rare earth oxide.
Claim 8
Dependent Claim
33 words
The catalyst support as defined by claim 1, said spinel type compound having the formula M 1 M 2 O 4 wherein is magnesium, zinc, cobalt or nickel, and M 2 is aluminum.
Claim 9
Dependent Claim
15 words
The catalyst support as defined by claim 7, wherein M 1 is nickel or cobalt.
Claim 10
Dependent Claim
18 words
The catalyst support as defined by claim 1, said at least one rare earth oxide comprising cerium oxide.
Claim 11
Dependent Claim
16 words
The catalyst support as defined by claim 1, said inert, rigid substrate comprising a refractory material.
Claim 12
Dependent Claim
19 words
The catalyst support as defined by claim 10, said refractory material comprising a metal or a ceramic shaped article.
Claim 13
Dependent Claim
16 words
The catalyst support as defined by claim 1, said inert, rigid substrate comprising a cellular monolith.
Claim 14
Dependent Claim
14 words
The catalyst support as defined by claim 13, said cellular monolith comprising a honeycomb.
Claim 15
Dependent Claim
32 words
A thermally stable, sulfur-resistant catalyst, comprising the catalyst support as defined by claim 1, said support having a catalytically effective amount of a catalytically active phase impregnated onto the porous coating thereof.
Claim 16
Dependent Claim
17 words
The catalyst as defined by claim 14, said catalytically active phase comprising at least one precious metal.
Claim 17
Dependent Claim
19 words
The catalyst as defined by claim 15, said at least one precious metal comprising platinum, palladium, rhodium or iridium.
Claim 18
Dependent Claim
19 words
The catalyst as defined by claim 15, said catalytically active phase comprising at least one other catalytically active element.
Claim 19
Dependent Claim
28 words
The catalyst as defined by claim 17, said at least one other catalytically active element comprising iron, zirconium, vanadium, chromium, germanium, cobalt, uranium, rhenium, or a rare earth.
Claim 20
Dependent Claim
11 words
The catalyst as defined by claim 14, comprising an oxidation catalyst.
Claim 21
Dependent Claim
11 words
The catalyst as defined by claim 14, comprising a multifunctional catalyst.
Claim 22
Dependent Claim
94 words
A process for the preparation of the catalyst as defined by claim 14, comprising (i) mixing a suspension of alumina with a spinel type compound, (ii) adjusting the pH of the mixture to a value less than 4, (iii) coating the inert, rigid support substrate with said pH-adjusted mixture, (iv) drying and calcining said coated substrate, (v) depositing at least one precursor of the at least one rare earth oxide onto said calcined substrate, (vi) drying and calcining the resulting shaped support, and (vii) impregnating a catalytically active phase onto the resulting catalyst support.
Claim 23
Dependent Claim
101 words
A process for the preparation of the catalyst as defined by claim 14, comprising (i) coating the inert, rigid substrate with a suspension of alumina, (ii) drying and calcining said coated substrate, (iii) impregnating said dried and calcined substrate with a solution of at least one precursor of magnesium, zinc, cobalt or nickel, (iv) calcining said impregnated substrate at a temperature of less than 1,000° C., (v) depositing a precursor of at least one rare earth onto the substrate thus coated, (vi) drying and calcining the resulting shaped support, and (vii) impregnating a catalytically active phase onto the resulting catalyst support.
Claim 24
Dependent Claim
79 words
A process for the preparation of the catalyst as defined by claim 14, comprising (i) mixing a suspension of alumina with a spinel compound and at least one precursor of at least one rare earth oxide, (ii) adjusting the pH of the mixture to a value less than 4, (iii) coating the inert, rigid support substrate with said pH-adjusted mixture, (iv) drying and calcining said coated substrate, and (v) impregnating a catalytically active phase onto the resulting catalyst support.
Claim 25
Dependent Claim
20 words
The process of claim 21, wherein the pH of step (ii) is adjusted to a value of at least 0.2.
Claim 26
Dependent Claim
20 words
The process of claim 23, wherein the pH of step (ii) is adjusted to a value of at least 0.2.
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) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |