Patent EP0056729A2 successfully refreshed from Google Patents.
EP0056729A2
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Catalysts
Assignee: Johnson Matthey PLC
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Filing: 1982-01-19
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Granted: —
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Expires: 2002-01-19
Abstract
Abstract This invention relates. to a three-way catalyst for use in the purification of exhaust gas from an internal combustion engine, a method of making the same and an exhaust system oncluding a three-way catalyst for an internal combustion engine. Specifically, the three-way catalyst comprises a substrate suitable for the purification of exhaust gas from an internal combustion engine wherein the catalyst comprises a substrate, a refractory oxide layer, tungsten and/or one or more tungsten containing compounds and one or more platinum group metals.
Inventors
- 👤 Michael Wyatt
- 👤 Ashley Mortimer Gould
- 👤 Gary Michael Leach
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 12:26
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; B01J23/64; B01J23/652; B01J23/6527; B01J37/00; B01J37/02; B01J37/024; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
40 words
A three-way catalyst suitable for the purification of exhaust gas from an internal combustion engine wherein the catalyst comprises a substrate, a refractory oxide layer, tungsten and/or one or more tungsten containing compounds and one or more platinum group metals.
Claim 2
Dependent Claim
40 words
A three-way catalyst suitable for the purification of exhaust gas from an internal combustion engine wherein the catalyst comprises a substrate, a refractory oxide layer, tungsten and/or one or more tungsten containing compounds and one or more platinum group metals.
Claim 3
Dependent Claim
21 words
A three-way catalyst according to claim 1 wherein the substrate is a monolithic structure fabricated from a ceramic or metallic material.
Claim 4
Dependent Claim
37 words
A three-way catalyst according to claim 1 wherein the refractory oxide layer comprises one or more of the oxides of B, Al, Ba, Sr, Ca, Mg, Be,. Si., Ti., Ni, Zr, Sc, Y and the lanthanide metals.
Claim 5
Dependent Claim
27 words
A three-way catalyst according to claim 3 wherein the loading of the refractory oxide layer is between 0.03 and 0.6 g per cm 3 of the substrate.
Claim 6
Dependent Claim
27 words
A three-way catalyst according to claim 3 wherein the loading of the refractory oxide layer is between 0.1 and 0.125 g per cm 3 of the substrate.
Claim 7
Dependent Claim
32 words
A three-way catalyst according to claim 1 wherein the platinum group metal or metals is present at- a loading of between 300 and 3500 g per m 3 of the washcoated monolith.
Claim 8
Dependent Claim
31 words
A three way-catalyst according to claim 1 wherein the platinum group metal or metals is present at a loading of between 600 and 1800 g per m 3 of washcoated monolith.
Claim 9
Dependent Claim
35 words
A three-way catalyst according to claim 1 wherein the tungsten is present as one or more compounds of tungsten containing oxygen and at a loading of between 700 and 21000 g per m 3 .
Claim 10
Dependent Claim
35 words
A three-way catalyst according to claim 1 wherein the tungsten is present as one or more compounds of tungsten containing oxygen and at a loading of between 3500 and 14000' 3 g per m .
Claim 11
Dependent Claim
35 words
A three-way catalyst according to claim 1 wherein the tungsten is. present as one or more compounds of tungsten containing oxygen and at a loading of between 5000 and 11,000 g per m 3 .
Claim 12
Dependent Claim
40 words
A three-way catalyst suitable for the purification of exhaust gas from an internal combustion engine wherein the catalyst comprises a substrate, a refractory oxide layer tungsten and/or one or more tungsten containing compounds and two or more platinum group metals.
Claim 13
Dependent Claim
40 words
A three-way catalyst suitable for the purification of exhaust gas from an internal combustion engine wherein the catalyst comprises a substrate, a refractory oxide layer tungsten and/or one or more tungsten containing compounds and two or more platinum group metals.
Claim 14
Independent Claim
62 words
A method for the preparation of a three-way catalyst comprising : (a) depositing a refractory oxide layer on a substrate; (b) depositing on the refractory oxide layer a catalyst component which comprises one or more platinum group metals, and, (c) before or after deposition, associating a tungsten-containing compound with the said refractory oxide and/or the said one or more platinum group metals.
Claim 15
Independent Claim
62 words
A method for the preparation of a three-way catalyst comprising : (a) depositing a refractory oxide layer on a substrate; (b) depositing on the refractory oxide layer a catalyst component which comprises one or more platinum group metals, and, (c) before or after deposition, associating a tungsten-containing compound with the said refractory oxide and/or the said one or more platinum group metals.
Claim 16
Dependent Claim
93 words
An exhaust system suitable for use on a motor vehicle powered by an internal combustion engine wherein the exhaust system comprises:- (a) a three-way catalyst for the purification of exhaust gas; (b) conveying means for conveying exhaust gas from the engine through the catalyst and out to the atmosphere; (c) means for regulating the oxygen content of the exhaust gas which regulating means are responsive to an oxygen sensor located in the conveying means wherein the catalyst comprises a tungsten and/or one or more tungsten-containing compounds and one or more platinum group metals.
Claim 17
Dependent Claim
93 words
An exhaust system suitable for use on a motor vehicle powered by an internal combustion engine wherein the exhaust system comprises:- (a) a three-way catalyst for the purification of exhaust gas; (b) conveying means for conveying exhaust gas from the engine through the catalyst and out to the atmosphere; (c) means for regulating the oxygen content of the exhaust gas which regulating means are responsive to an oxygen sensor located in the conveying means wherein the catalyst comprises a tungsten and/or one or more tungsten-containing compounds and one or more platinum group metals.
References Cited (Backward Citations)
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