Patent EP0622107A2 successfully refreshed from Google Patents.
EP0622107A2
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EP
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Exhaust gas purifying catalyst in diesel engines
Assignee: Cataler Corp
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Filing: 1994-04-27
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Granted: —
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Expires: 2014-04-27
Abstract
Abstract In an exhaust gas purifying catalyst in diesel engines, platinum catalyst is loaded on the upstream side of an exhaust gas flow, and palladium catalyst is loaded on the lower stream side of the exhaust gas flow. HC and SOF in the exhaust gas can be burned and removed by the platinum catalyst at low temperature. SO₂ is not oxidized at low temperature. The exhaust gas is heated to high temperature at the upstream portion. HC and SOF is effectively oxidized and removed by palladium catalyst at high temperature. SO₂ is not oxidized even at higher temperature. Therefore, in the exhaust gas purifying catalyst of the present invention, HC and SOF can be removed at low temperature and SO₂ is not oxidized.
Inventors
- 👤 Yoshitsugu C/O Toyota Jidosha K.K. Ogura
- 👤 Yukari C/O Toyota Jidosha K.K. Ito
- 👤 Satoshi C/O Toyota Jidosha K.K. Kaneko
- 👤 Toshiaki C/O Toyota Jidosha K.K. Tanaka
- 👤 Yukimura C/O Cataler Ind. Co. Ltd. Yamada
- 👤 Norihiko C/O Cataler Ind. Co. Ltd. Aono
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 09:39
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/024; B01J37/0244; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J23/00; B01J23/38; B01J23/40; B01J23/44; B01J35/00; B01J35/19; F; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
66 words
An exhaust gas purifying catalyst in diesel engines comprising: a support base, a catalyst loaded layer formed on the surface of said support base, and a catalyst metal loaded on said catalyst loaded layer; said catalyst metal comprising a platinum catalyst loaded on the upstream side of the exhaust gas flow and a palladium catalyst loaded on the lower stream side of said exhaust gas flow.
Claim 2
Dependent Claim
49 words
An exhaust gas purifying catalyst in diesel engines according to claim 1, wherein the ratio of the volume of the portion on which said platinum catalyst is loaded to the volume of the portion on which said palladium catalyst is loaded is in the range of 1:10 to 1:2.
Claim 3
Dependent Claim
85 words
An exhaust gas purifying catalyst in diesel engines according to claim 1, wherein said catalyst loaded layer comprises one catalyst loaded layer portion, on which said platinum catalyst is loaded, is formed of one selected from the group consisting of alumina, alumina and lanthanum, alumina and ceria, titania, and silica; and another catalyst loaded layer portion, on which palladium catalyst is loaded, is formed of one selected from the group consisting of titania, silica and titania, silica and alumina, alumina, alumina and ceria, and silica.
Claim 4
Dependent Claim
105 words
An exhaust gas purifying catalyst in diesel engines according to claim 1, wherein said catalyst loaded layer comprising a catalyst loaded layer portion formed of alumina and on the surface of said support base at the upstream side of said exhaust gas flow, and a mixed catalyst loaded layer portion formed of silica and alumina and on the surface of said support base at the lower stream side of said exhaust gas flow; said platinum catalyst is loaded on said catalyst loaded layer portion formed of alumina, and said palladium catalyst is loaded on said mixed catalyst loaded layer portion formed of silica and alumina.
Claim 5
Dependent Claim
37 words
An exhaust gas purifying catalyst in diesel engines according to claim 4, wherein the weight ratio of said silica to said alumina in said mixed catalyst loaded layer portion is in the range of 9:1 to 1:1.
Claim 6
Dependent Claim
28 words
An exhaust gas purifying catalyst in diesel engines according to claim 1, wherein platinum catalyst is further loaded on the lowest stream side of said exhaust gas flow.
Claim 7
Dependent Claim
132 words
An exhaust gas purifying catalyst in diesel engines according to claim 6, wherein said catalyst loaded layer comprising a catalyst loaded layer portion formed of alumina and on the surface of said support base at the upstream side of said exhaust gas flow, a mixed catalyst loaded layer portion formed of silica and alumina and on the surface of said support base at the lower stream side of said exhaust gas flow, and a catalyst loaded layer portion formed of alumina and on the surface of said support base at the lowest stream side of said exhaust gas flow; said platinum catalyst is loaded on both said catalyst loaded layer portion formed of alumina, and said palladium catalyst is loaded on said mixed catalyst loaded layer portion formed of silica and alumina.
Claim 8
Dependent Claim
34 words
An exhaust gas purifying catalyst in diesel engines according to claim 7, wherein the particle diameter of said alumina in said catalyst loaded layer comprising alumina is in the range of 0.1 to 10µm.
Claim 9
Dependent Claim
27 words
An exhaust gas purifying catalyst in diesel engines according to claim 8, wherein the particle diameter of said alumina is in the range of 0.5 to 5µm.
Claim 10
Dependent Claim
35 words
An exhaust gas purifying catalyst in diesel engines according to claim 1, wherein said catalyst metals comprises said platinum catalyst, said palladium catalyst, and catalyst metals other than said platinum catalyst and said palladium catalyst.
Claim 11
Dependent Claim
28 words
An exhaust gas purifying catalyst in diesel engines according to claim 10, wherein said catalyst metal other than said platinum catalyst and said palladium catalyst is rhodium catalyst.
Claim 12
Dependent Claim
22 words
An exhaust gas purifying catalyst in diesel engines according to claim 11, wherein said rhodium catalyst is mixed with said palladium catalyst.
Claim 13
Dependent Claim
33 words
An exhaust gas purifying catalyst in diesel engines according to claim 1, wherein said support base is selected from the group consisting of ceramic monolith support, ceramic foam support and metal honeycomb support.
Claim 14
Dependent Claim
117 words
An exhaust gas purifying catalyst in diesel engines according to claim 1, wherein said support base comprises an upstream side support base arranged at the upstream side of said exhaust gas flow and a downstream side support base arranged at the downstream side of said exhaust gas flow, and said catalyst loaded layer comprises an upstream side catalyst loaded layer portion formed on the surface of said upstream side support base and a downstream side catalyst loaded layer portion formed on the surface of said downstream side support base, and said platinum catalyst is loaded on said upstream side catalyst loaded layer portion and said palladium catalyst is loaded on said downstream side catalyst loaded layer portion.
Claim 15
Dependent Claim
69 words
An exhaust gas purifying catalyst in diesel engines according to claim 14, wherein said upstream side catalyst loaded layer portion is formed of one selected from the group consisting of alumina, alumina and lanthanum, alumina and ceria, titania, or silica; and said downstream side catalyst loaded layer portion is formed of one selected from the group consisting of titania, silica and titania, silica and alumina, alumina, alumina and ceria.
Claim 16
Dependent Claim
82 words
An exhaust gas purifying catalyst in diesel engines according to claim 14, wherein said upstream side catalyst loaded layer portion comprises a first layer formed of titania and a second layer formed on said first layer, said second layer is formed of one selected from the group consisting of alumina, alumina and lanthanum, alumina and ceria, titania, silica; and palladium catalyst and rhodium catalyst are loaded on said first layer, and said platinum catalyst is loaded on said second catalyst loaded layer.
Claim 17
Dependent Claim
41 words
An exhaust gas purifying catalyst in diesel engines according to claim 17, wherein the ratio of the volume of said upstream side support base to the volume of said downstream side support base is in the range of 1:10 to 1:2.
References Cited (Backward Citations)
No citation records indexed.
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