US5208202A
Expired / Lapsed
US
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Exhaust gas cleaner and method of cleaning exhaust gas catalyst for cleaning exhaust gas
Assignee: Kocat Inc
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Filing: 1991-09-25
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Granted: 1993-05-04
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Expires: 2011-09-25
Abstract
Abstract The exhaust gas cleaner comprising a heat-resistant, porous body and a catalyst supported by the body for cleaning an exhaust gas containing substantially no fine carbonaceous particles, which is equivalent to an oxidizing atmosphere, the catalyst consisting essentially of (a) one or more alkali metal elements; (b) one or more transition metal elements in Group IB; Group IIB, Group VB, Group VIB, Group VIIB and Group VIII of the Periodic Table (excluding platinum-group elements), and Sn; and (c) one or more rare earth elements. The second catalyst consisting essentially of at least one platinum-group element, may be supported by the heat-resistant, porous body.
Inventors
- 👤 Gyo Muramatsu
- 👤 Kiyohide Yoshida
- 👤 Satoshi Sumiya
- 👤 Akira Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:45
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/02; B01J23/04; B01J23/10; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
94 words
A catalyst for cleaning an exhaust gas containing substantially no fine carbonaceous particles, which is capable of removing nitrogen oxides from said exhaust gas regarded as an oxidizing atmosphere by utilizing unburned hydrocarbons contained in said exhaust gas as agents for reducing said nitrogen oxides, said catalyst being a mixture consisting essentially of: (a) 10-80% by weight of one or more alkali metal elements selected from the group consisting of Na, K, Cs, Rb and Fr; (b) 10-80% by weight of copper; and (c) 10-80% by weight of one or more rare earth elements.
Claim 2
Dependent Claim
94 words
A catalyst for cleaning an exhaust gas containing substantially no fine carbonaceous particles, which is capable of removing nitrogen oxides from said exhaust gas regarded as an oxidizing atmosphere by utilizing unburned hydrocarbons contained in said exhaust gas as agents for reducing said nitrogen oxides, said catalyst being a mixture consisting essentially of: (a) 10-80% by weight of one or more alkali metal elements selected from the group consisting of Na, K, Cs, Rb and Fr; (b) 10-80% by weight of copper; and (c) 10-80% by weight of one or more rare earth elements.
Claim 3
Dependent Claim
83 words
An exhaust gas cleaner comprising a heat-resistant, porous body and a catalyst supported by said body for cleaning an exhaust gas containing substantially no fine carbonaceous particles which is equivalent to an oxidizing atmosphere, said catalyst being a mixture consisting essentially of: (a) 10-80% by weight of one or more alkali metal elements selected from the group consisting of Na, K, Cs, Rb and Fr; (b) 10-80% by weight of copper; and (c) 10-80% by weight of one or more rare earth elements.
Claim 4
Dependent Claim
83 words
An exhaust gas cleaner comprising a heat-resistant, porous body and a catalyst supported by said body for cleaning an exhaust gas containing substantially no fine carbonaceous particles which is equivalent to an oxidizing atmosphere, said catalyst being a mixture consisting essentially of: (a) 10-80% by weight of one or more alkali metal elements selected from the group consisting of Na, K, Cs, Rb and Fr; (b) 10-80% by weight of copper; and (c) 10-80% by weight of one or more rare earth elements.
Claim 5
Dependent Claim
35 words
The exhaust gas cleaner according to claim 2, each of said metal elements being in the form of an oxide and wherein said catalyst is supported by said heat-resistant porous body by a sol-gel method.
Claim 6
Dependent Claim
34 words
The exhaust gas cleaner according to claim 3, wherein a carrier layer is formed on said body by a sol-gel method, and said catalyst is supported by said carrier layer by impregnation or precipitation.
Claim 7
Dependent Claim
36 words
The exhaust gas cleaner according to claim 4, wherein said catalyst is supported by said carrier layer at the same time of forming said carrier layer by a sol-gel method using organic salts of catalytic components.
Claim 8
Dependent Claim
113 words
An exhaust gas cleaner comprising a heat-resistant, porous body, a first catalyst supported by said body on the inlet side, and a second catalyst supported by said body on the outlet side, for cleaning an exhaust gas containing substantially no fine carbonaceous particles, which is regarded as an oxidizing atmosphere, said first catalyst consisting essentially of: (a) one or more alkali metal elements; (b) one or more transition metal elements in Group IB, Group IIB, Group VB, Group VIB, Group VIIB, and Group VIII of the Periodic Table, excluding platinum-group elements, and Sn; and (c) one or more rare earth elements; and said second catalyst consisting essentially of at least one platinum-group element.
Claim 9
Dependent Claim
113 words
An exhaust gas cleaner comprising a heat-resistant, porous body, a first catalyst supported by said body on the inlet side, and a second catalyst supported by said body on the outlet side, for cleaning an exhaust gas containing substantially no fine carbonaceous particles, which is regarded as an oxidizing atmosphere, said first catalyst consisting essentially of: (a) one or more alkali metal elements; (b) one or more transition metal elements in Group IB, Group IIB, Group VB, Group VIB, Group VIIB, and Group VIII of the Periodic Table, excluding platinum-group elements, and Sn; and (c) one or more rare earth elements; and said second catalyst consisting essentially of at least one platinum-group element.
Claim 10
Dependent Claim
28 words
The exhaust gas cleaner according to claim 6, wherein said second catalyst further contains a metal selected from the group consisting of Au Ag, or a combination thereof.
Claim 11
Dependent Claim
25 words
The exhaust gas cleaner according to claim 6 or 7, wherein said two catalysts are supported by a carrier layer formed on said porous body.
Claim 12
Dependent Claim
22 words
The exhaust gas cleaner according to claim 8, wherein said carrier layer is formed by a wash-coating method or a sol-gel method.
Claim 13
Dependent Claim
25 words
The exhaust gas cleaner according to claim 6, wherein said second catalyst is subjected to light irradiation before or after its application to said body.
Claim 14
Dependent Claim
28 words
The exhaust gas cleaner according to claim 10, wherein said second catalyst further contains a metal selected from the group consisting of Au Ag, or a combination thereof.
Claim 15
Dependent Claim
27 words
The exhaust gas cleaner according to claim 10 or 11, wherein said first and second catalysts are supported by a carrier layer formed on said porous body.
Claim 16
Dependent Claim
22 words
The exhaust gas cleaner according to claim 12, wherein said carrier layer is formed by a wash-coating method or a sol-gel method.
Claim 17
Dependent Claim
121 words
A catalyst for cleaning an exhaust gas containing substantially no fine carbonaceous particles, which is capable of removing nitrogen oxides from said exhaust gas regarded as an oxidizing atmosphere by utilizing unburned hydrocarbons contained in said exhaust gas as agents for reducing said nitrogen oxides, said catalyst being a mixture consisting essentially of: (a) 25-50% by weight of one or more alkali metal elements selected from the group consisting of Li, Na, K and Cs; (b) 25-50% by weight of one or more transition metal elements in Group IB, Group IIB, Group VB, Group VIB, Group VIIB and Group VIII of the Periodic Table, excluding platinum-group elements, and Sn; and (c) 25-50% by weight of one or more rare earth elements.
Claim 18
Dependent Claim
121 words
A catalyst for cleaning an exhaust gas containing substantially no fine carbonaceous particles, which is capable of removing nitrogen oxides from said exhaust gas regarded as an oxidizing atmosphere by utilizing unburned hydrocarbons contained in said exhaust gas as agents for reducing said nitrogen oxides, said catalyst being a mixture consisting essentially of: (a) 25-50% by weight of one or more alkali metal elements selected from the group consisting of Li, Na, K and Cs; (b) 25-50% by weight of one or more transition metal elements in Group IB, Group IIB, Group VB, Group VIB, Group VIIB and Group VIII of the Periodic Table, excluding platinum-group elements, and Sn; and (c) 25-50% by weight of one or more rare earth elements.
Claim 19
Dependent Claim
124 words
An exhaust gas cleaner comprising a heat-resistant, porous body, a first catalyst supported by said body on the inlet side and a second catalyst supported on the outlet side for cleaning an exhaust gas containing substantially no fine carbonaceous particles, which is equivalent to an oxidizing atmosphere, said catalyst being a mixture consisting essentially of: (a) 25-50% by weight of one or more alkali metal elements; (b) 25-50% by weight of one of more transition metal elements in Group IB, Group IIB, Group VB, Group VIB, Group VIIB, and Group VIII of the Periodic Table, excluding platinum-group elements, and Sn; and (c) 25-50% by weight of one or more rare earth elements; and said second catalyst consisting essentially of at least one platinum-group element.
Claim 20
Dependent Claim
124 words
An exhaust gas cleaner comprising a heat-resistant, porous body, a first catalyst supported by said body on the inlet side and a second catalyst supported on the outlet side for cleaning an exhaust gas containing substantially no fine carbonaceous particles, which is equivalent to an oxidizing atmosphere, said catalyst being a mixture consisting essentially of: (a) 25-50% by weight of one or more alkali metal elements; (b) 25-50% by weight of one of more transition metal elements in Group IB, Group IIB, Group VB, Group VIB, Group VIIB, and Group VIII of the Periodic Table, excluding platinum-group elements, and Sn; and (c) 25-50% by weight of one or more rare earth elements; and said second catalyst consisting essentially of at least one platinum-group element.
Claim 21
Dependent Claim
17 words
The exhaust gas cleaner according to claim 6, wherein said second catalyst further contains Au and Ag.
Claim 22
Dependent Claim
17 words
The exhaust gas cleaner according to claim 10, wherein said second catalyst further contains Au and Ag.
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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) | 1996-05-03 | 1996-11-02 | 1997-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-03 | 2000-11-02 | 2001-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-03 | 2004-11-02 | 2005-05-04 | $7700.00 | Window Closed / Lapsed |