Patent US3969480A successfully refreshed from Google Patents.
US3969480A
Expired / Lapsed
US
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Nickel base nox reducing catalytic structure
Assignee: Pullman Co LLC
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Filing: 1974-03-14
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Granted: 1976-07-13
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Expires: 1994-03-14
Abstract
Abstract A system for reducing NOx gases found in the exhaust stream of the internal combustion engine is provided which includes an internal combustion engine having associated therewith a means for supplying fuel and oxygen to the engine, a manifold system for directing or channeling the exhaust gases from the engine, and a NOx reducing catalyst assembly communicating with the manifold which includes a housing having a NOx reducing catalytic structure of apertured thin metal foil positioned therein which comprises a durable, chromium containing corrosion resistant nickel base substrate having on at least one surface, an effective amount of a NOx reducing catalyst selected from the group consisting of iron, nickel, cobalt, copper, manganese and mixtures thereof.
Inventors
- 👤 Robert J. Fedor
- 👤 Cameron S. Ogden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:52
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/9454; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/866; B01J35/00; B01J35/50; B01J35/56; B01J37/00; B01J37/02; B01J37/0215; B01J37/0225; F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2807; F01N3/2839; F01N3/2842; B01D2255/00; B01D2255/20; B01D2255/204; B01D2255/2047; B01D2255/207; B01D2255/2073; B01D2255/20753; B01D2255/20761; B01D2255/20784; B01D2255/209; B01D2255/2092; B01D2255/30; F01N2330/00; F01N2330/02; F01N2450/00; F01N2450/24; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
216 words
In the combination comprising an internal combustion engine and a catalyst for catalytically reducing nitrogen oxides in the exhaust gases of said engine, the improvement wherein said catalyst comprises a thin expanded metal foil structure comprising a corrosion resistant nickel base substrate having an effective amount of NO x reducing catalyst metallurgically bonded on the surface thereof, said nickel base substrate before metallurgical bonding of said NO x catalyst comprising: from about 50 to about 85 weight percent of a mixture of nickel and a metal selected from the group consisting of iron, cobalt and mixtures thereof, with nickel always being present in an amount equal to at least about 17 weight percent of the substrate and the weight percent of iron and cobalt individually never exceeding about 40 percent and always being less then the weight percent of nickel, but at least one thereof being present in excess of a trace amount; and from about 15 to about 50 weight percent of a metal selected from the group consisting of chromium, aluminum and mixtures thereof with at least about 5weight percent of chromium always present in the substrate and the amount of aluminum never exceeding about 10 weight percent; the chemical composition of the catalytic layer being different than the chemical composition of said substrate.
Claim 2
Dependent Claim
216 words
In the combination comprising an internal combustion engine and a catalyst for catalytically reducing nitrogen oxides in the exhaust gases of said engine, the improvement wherein said catalyst comprises a thin expanded metal foil structure comprising a corrosion resistant nickel base substrate having an effective amount of NO x reducing catalyst metallurgically bonded on the surface thereof, said nickel base substrate before metallurgical bonding of said NO x catalyst comprising: from about 50 to about 85 weight percent of a mixture of nickel and a metal selected from the group consisting of iron, cobalt and mixtures thereof, with nickel always being present in an amount equal to at least about 17 weight percent of the substrate and the weight percent of iron and cobalt individually never exceeding about 40 percent and always being less then the weight percent of nickel, but at least one thereof being present in excess of a trace amount; and from about 15 to about 50 weight percent of a metal selected from the group consisting of chromium, aluminum and mixtures thereof with at least about 5weight percent of chromium always present in the substrate and the amount of aluminum never exceeding about 10 weight percent; the chemical composition of the catalytic layer being different than the chemical composition of said substrate.
Claim 3
Dependent Claim
28 words
The combination of claim 1 wherein said NO x reducing catalyst comprises a metal selected from the group consisting of nickel, cobalt, iron, manganese, copper and mixtures thereof.
Claim 4
Dependent Claim
18 words
The combination of claim 2 wherein said NO x reducing catalyst is an alloy of copper and nickel.
Claim 5
Dependent Claim
23 words
The combination of claim 3 wherein said NO x reducing catalyst consists essentially of 80 weight percent nickel and 20 weight percent copper.
Claim 6
Dependent Claim
19 words
The combination of claim 1 wherein said expanded thin metal has a thickness of less than about 0.010 inches.
Claim 7
Dependent Claim
24 words
The combination of claim 1 wherein said catalytic layer constitutes from about 0.5 weight percent to about 50 weight percent of said catalytic structure.
Claim 8
Dependent Claim
21 words
The combination of claim 1 wherein the surface of said catalytic layer contains less than about 15 weight percent of chromium.
Claim 9
Dependent Claim
29 words
The combination of claim 7 wherein the weight percent of chromium on the surface of the catalytic layer is less than the weight percent of chromium in the substrate.
Claim 10
Dependent Claim
32 words
The combination of claim 7 wherein said chromium is present as a gradient of concentration, the concentration in said substrate being a maximum and the concentration of said surface being essentially zero.
Claim 11
Dependent Claim
20 words
The combination of claim 1 wherein the surface of said catalytic layer contains less than about 4 weight percent aluminum.
Claim 12
Dependent Claim
32 words
The combination of claim 3 wherein said chromium is present as a gradient of concentration, the concentration in said substrate being a maximum and the concentration on said surface being essentially zero.
Claim 13
Dependent Claim
230 words
In the method of treating exhaust gases emanating from an internal combustion engine to catalytically reduce nitrogen oxides in said gases to relatively harmless substances, the improvement comprising: contacting said gases with an NO x reducing catalyst comprising a thin expanded metal foil structure comprising a corrosion resistant chromium and aluminum containing nickel base substrate having an effective amount of NO x reducing catalyst metallurgically bonded on the surface thereof, said nickel base substrate before metallurgical bonding of said NO x catalyst comprising: from about 50 to about 85 weight percent of a mixture of nickel and a metal selected from the group consisting of iron, cobalt and mixtures thereof, with nickel always being present in an amount equal to at least about 17 weight percent of the substrate and the weight percent of iron and cobalt individually never exceeding about 40 percent and always being less than the weight percent of nickel, but at least one thereof being present in excess of a trace amount; and from about 15 to about 50 weight percent of a metal selected from the group consistng of chromium, aluminum and mixtures thereof with at least about 5 weight percent of chromium always present in the substrate and the amount of aluminum never exceeding about 10 weight percent; the chemical composition of said catalytic layer being different from the chemical composition of said substrate.
Claim 14
Dependent Claim
230 words
In the method of treating exhaust gases emanating from an internal combustion engine to catalytically reduce nitrogen oxides in said gases to relatively harmless substances, the improvement comprising: contacting said gases with an NO x reducing catalyst comprising a thin expanded metal foil structure comprising a corrosion resistant chromium and aluminum containing nickel base substrate having an effective amount of NO x reducing catalyst metallurgically bonded on the surface thereof, said nickel base substrate before metallurgical bonding of said NO x catalyst comprising: from about 50 to about 85 weight percent of a mixture of nickel and a metal selected from the group consisting of iron, cobalt and mixtures thereof, with nickel always being present in an amount equal to at least about 17 weight percent of the substrate and the weight percent of iron and cobalt individually never exceeding about 40 percent and always being less than the weight percent of nickel, but at least one thereof being present in excess of a trace amount; and from about 15 to about 50 weight percent of a metal selected from the group consistng of chromium, aluminum and mixtures thereof with at least about 5 weight percent of chromium always present in the substrate and the amount of aluminum never exceeding about 10 weight percent; the chemical composition of said catalytic layer being different from the chemical composition of said substrate.
Claim 15
Dependent Claim
31 words
The method of claim 12 wherein said NO x reducing catalyst before metallurgical bonding comprises a metal selected from the group consisting of nickel, cobalt, iron, manganese, copper and mixtures thereof.
Claim 16
Dependent Claim
18 words
The method of claim 13 wherein said NO x reducing catayst comprises an alloy of copper and nickel.
Claim 17
Dependent Claim
17 words
The method of claim 13 wherein said foil has a thickness of less than about 0.010 inches.
Claim 18
Dependent Claim
18 words
The method of claim 15 wherein said NO x reducing catalyst comprises an alloy of copper and nickel.
Claim 19
Dependent Claim
43 words
The method of claim 13 wherein said chromium is present in said catalytic structure as a gradient of concentrations, the concentration in said substrate being at a maximum and the concentration on said surface being a minimum and not more than 15 percent.
Claim 20
Dependent Claim
43 words
The method of claim 14 wherein said chromium is present in said catalytic structure as a gradient of concentrations, the concentration in said substrate being at a maximum and the concentration on said surface being a minimum and not more than 15 percent.
Claim 21
Dependent Claim
15 words
The method of claim 13 wherein said exhaust gases contain CO, H 2 and hydrocarbons.
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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |