Patent US4478797A successfully refreshed from Google Patents.
US4478797A
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Exhaust gas purification
Assignee: Johnson Matthey PLC
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Filing: 1982-09-23
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Granted: 1984-10-23
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Expires: 2002-09-23
Abstract
Abstract An oxidation catalyst for use in a catalytic exhaust gas purification unit comprises a substrate on which a refractory metal oxide is coated, a base metal component and one or more metals from the Platinum Group. The catalyst is highly effective when a metallic substrate is employed and the loading of the refractory metal oxide coating is relatively high. The base metal is useful for catalysts having a ceramic substrate and a relatively low coating loading.
Inventors
- 👤 Alan F. Diwell
- 👤 Andrew Salathiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:24
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/8933; B01J23/8993; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J23/38; B01J23/54; B01J23/56; B01J37/00; B01J37/02; B01J37/024
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
89 words
A method for the oxidation of exhaust comprising oxygen and products of combustion in a spark ignition internal combustion engine of fuel containing a lead moiety and a lead scavenger, said method comprising passing the exhaust gas through a catalyst consisting essentially of a mixture of one or more platinum group metals, at least some of which is platinum, and WO 3 , TiO 2 or NiMoO 4 deposited upon a substrate in the form of a monolithic cellular structure made from ceramic or metallic material coated with alumina.
Claim 2
Independent Claim
89 words
A method for the oxidation of exhaust comprising oxygen and products of combustion in a spark ignition internal combustion engine of fuel containing a lead moiety and a lead scavenger, said method comprising passing the exhaust gas through a catalyst consisting essentially of a mixture of one or more platinum group metals, at least some of which is platinum, and WO 3 , TiO 2 or NiMoO 4 deposited upon a substrate in the form of a monolithic cellular structure made from ceramic or metallic material coated with alumina.
Claim 3
Dependent Claim
21 words
A method according to claim 1, wherein the substrate is a monolithic structure made from a ceramic material coated with alumina.
Claim 4
Dependent Claim
26 words
A method according to claim 2, wherein the ceramic material is zircon-mullite, mullite, alumina stillimanite, magnesium silicate, kaolin clay, zircon, petalite, spodumene, cordierite or alumina silicate.
Claim 5
Dependent Claim
21 words
A method according to claim 1, wherein the substrate is a monolithic structure made from a metallic material coated with alumina.
Claim 6
Dependent Claim
16 words
A method according to claim 4, wherein the metallic material is an oxidation-resistant metal or alloy.
Claim 7
Dependent Claim
21 words
A method according to claim 1, wherein the loading of the alumina is in the range 0.5-20 g in -3 .
Claim 8
Dependent Claim
21 words
A method according to claim 1, wherein the loading of the alumina is in the range 2-6 g in -3 .
Claim 9
Dependent Claim
21 words
A method according to claim 1, wherein the loading of the alumina is in the range 4-6 g in -3 .
Claim 10
Dependent Claim
22 words
A method according to claim 1, wherein the loading of the base metal is in the range 50-2000 g ft -3 .
Claim 11
Dependent Claim
19 words
A method according to claim 1, wherein the loading of the base metal is 400 g ft -3 .
Claim 12
Dependent Claim
25 words
A method according to claim 9, wherein the loading of the platinum group metal or metals is in the range 10-150 g ft -3 .
Claim 13
Dependent Claim
22 words
A method according to claim 1, wherein the loading of the platinum group metal or metals is 40 g ft -3 .
Claim 14
Independent Claim
88 words
A method for the oxidation of exhaust comprising oxygen and products of combustion in a spark ignition internal combustion engine of fuel containing a lead moiety and a lead scavenger without using direct ignition, said method comprising passing the exhaust gas through a catalyst consisting essentially of a mixture of one or more platinum group metals, at least some of which is platinum itself, and NIMoO 4 deposted upon a substrate in the form of a monolithic cellular structure made from ceramic or metallic material coated with alumina.
Claim 15
Independent Claim
88 words
A method for the oxidation of exhaust comprising oxygen and products of combustion in a spark ignition internal combustion engine of fuel containing a lead moiety and a lead scavenger without using direct ignition, said method comprising passing the exhaust gas through a catalyst consisting essentially of a mixture of one or more platinum group metals, at least some of which is platinum itself, and NIMoO 4 deposted upon a substrate in the form of a monolithic cellular structure made from ceramic or metallic material coated with alumina.
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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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |