US3939097A
Expired / Lapsed
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Exhaust gas cleaning catalysts and method of producing same
Assignee: Kanadevia Corp
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Filing: 1973-12-06
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Granted: 1976-02-17
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Expires: 1993-12-06
Abstract
Abstract Exhaust gas cleaning catalysts are produced by alloying copper and aluminum with at least one of the elements, nickel and chromium, and eluting by alkali or acid means aluminum from the cooled alloy surface. Small amounts of other metals from the fourth or fifth period V DIFFERENCE VIII groups, may be added to the catalysts by alloying, or by impregnation, for enhanced catalytic properties. The catalysts exhibit improved reduction of NO and oxidation of CO in an exhaust gas stream, in the presence of Pb, SO2, moisture and hydrocarbons (H.C) and at relatively low temperatures.
Inventors
- 👤 So Takeoka
- 👤 Hideya Inaba
- 👤 Masayoshi Ichiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:31
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01D53/46; B01D53/60; B01D53/9459; B01J; B01J23/00; B01J23/70; B01J23/74; B01J23/755; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868; B01J25/00; B01D2255/00; B01D2255/20; B01D2255/207; B01D2255/20753; B01D2255/20761; B01D2255/20784; B01D2255/209; B01D2255/2092; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
98 words
A method of producing an exhaust gas cleaning catalyst comprising the steps of forming an alloy composed of 20 to 50% by weight of Cu; at least one of the metals Ni in an amount of 1 to 20% by weight, and Cr in an amount of 0.5 to 8% by weight; and Al as the remaining percent by weight; adding at least one additional metal selected from the group consisting of V, Mn, Fe, Co, Nb, Mo, Ru, Rh and Pd; and eluting Al from the surface of said alloy to activate the surface of said catalyst.
Claim 2
Independent Claim
98 words
A method of producing an exhaust gas cleaning catalyst comprising the steps of forming an alloy composed of 20 to 50% by weight of Cu; at least one of the metals Ni in an amount of 1 to 20% by weight, and Cr in an amount of 0.5 to 8% by weight; and Al as the remaining percent by weight; adding at least one additional metal selected from the group consisting of V, Mn, Fe, Co, Nb, Mo, Ru, Rh and Pd; and eluting Al from the surface of said alloy to activate the surface of said catalyst.
Claim 3
Dependent Claim
35 words
A method of producing an exhaust gas cleaning catalyst according to claim 1 wherein said alloy is applied to a preformed base member consisting of a metal having a higher melting point than said alloy.
Claim 4
Dependent Claim
22 words
A method of producing an exhaust gas cleaning catalyst according to claim 2 wherein said alloy is sprayed on said base member.
Claim 5
Dependent Claim
25 words
A method of producing an exhaust gas cleaning catalyst according to claim 1 wherein said eluting step is carried out by employing a non-oxidizing acid.
Claim 6
Dependent Claim
24 words
A method of producing an exhaust gas cleaning catalyst according to claim 1 wherein said eluting step is carried out by employing an alkali.
Claim 7
Dependent Claim
23 words
A method of producing an exhaust gas cleaning catalyst according to claim 1 wherein said additional metal is added in said forming step.
Claim 8
Dependent Claim
31 words
A method of producing an exhaust gas cleaning catalyst according to claim 1 wherein said adding step is carried out by applying said additional metal to the surface of said alloy.
Claim 9
Dependent Claim
38 words
A method of producing an exhaust gas cleaning catalyst according to claim 7 wherein said additional metal is applied to the eluted surface of said alloy in the form of a salt and said alloy is then baked.
Claim 10
Dependent Claim
47 words
A method of producing an exhaust gas cleaning catalyst according to claim 1 wherein said additional metal is employed in the following amounts by weight: V, mn, Co, Mo, Nb -- 0.1 to 5%; Ru, Rh, Pd -- 0.01 to 0.1%; and, Fe -- 1.0 to 20%.
Claim 11
Dependent Claim
90 words
An exhaust gas cleaning catalyst comprising an alloy composed of 20 to 50% by weight of Cu, at least one of the metals Ni in an amount of 1 to 20% by weight and Cr in an amount of 0.5 to 8% by weight, and Al as the remaining percent by weight; said catalyst including at least one additional metal selected from the group consisting of V, Mn, Fe, Co, Nb, Mo, Ru, Rh and Pd; and the surface of said catalyst being activated by the removal of Al therefrom.
Claim 12
Dependent Claim
90 words
An exhaust gas cleaning catalyst comprising an alloy composed of 20 to 50% by weight of Cu, at least one of the metals Ni in an amount of 1 to 20% by weight and Cr in an amount of 0.5 to 8% by weight, and Al as the remaining percent by weight; said catalyst including at least one additional metal selected from the group consisting of V, Mn, Fe, Co, Nb, Mo, Ru, Rh and Pd; and the surface of said catalyst being activated by the removal of Al therefrom.
Claim 13
Dependent Claim
20 words
An exhaust cleaning catalyst according to claim 10 wherein said additional metal is deposited on the surface of the catalyst.
Claim 14
Dependent Claim
42 words
An exhaust cleaning catalyst according to claim 10 wherein said additional metal is employed in the following amounts by weight: V, mn, Co, Mo, Nb -- 0.1 to 5%; Ru, Rh, Pd -- 0.01 to 0.1%; and, Fe -- 1.0 to 20%.
Claim 15
Dependent Claim
20 words
An exhaust gas cleaning catalyst according to claim 10 further comprising a base member on which said alloy is carried.
Claim 16
Dependent Claim
25 words
An exhaust gas cleaning catalyst according to claim 13 wherein said base member consists of a metal having a higher melting point than said alloy.
Claim 17
Independent Claim
74 words
A method of producing an exhaust gas cleaning catalyst consisting of forming an alloy composed of 20 to 50% by weight of copper; at least one of the metals Ni in an amount of 3 to 7% by weight and Cr in an amount of 0.5 to 85 by weight; and Al as the remaining percent by weight; and eluting Al from the surface of said alloy to activate the surface of said catalyst.
Claim 18
Independent Claim
74 words
A method of producing an exhaust gas cleaning catalyst consisting of forming an alloy composed of 20 to 50% by weight of copper; at least one of the metals Ni in an amount of 3 to 7% by weight and Cr in an amount of 0.5 to 85 by weight; and Al as the remaining percent by weight; and eluting Al from the surface of said alloy to activate the surface of said catalyst.
Claim 19
Dependent Claim
65 words
An exhaust gas cleaning catalyst comprising an alloy composed of 20 to 50% by weight of copper; at least one of the metals Ni in an amount of 3 to 7% by weight and Cr in an amount of 0.5 to 8% by weight; and Al as the remaining percent by weight; the surface of said alloy being activated by the removal of Al therefrom.
Claim 20
Dependent Claim
65 words
An exhaust gas cleaning catalyst comprising an alloy composed of 20 to 50% by weight of copper; at least one of the metals Ni in an amount of 3 to 7% by weight and Cr in an amount of 0.5 to 8% by weight; and Al as the remaining percent by weight; the surface of said alloy being activated by the removal of Al therefrom.
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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |