US3923696A
Expired / Lapsed
US
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Catalyst structure
Assignee: Huntington Alloys Corp
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Filing: 1973-08-22
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Granted: 1975-12-02
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Expires: 1993-08-22
Abstract
Abstract A catalyst structure particularly useful in automotive exhaust catalysis comprising a metallic substrate, a catalytic outer surface and a layer of chromium oxide interposed therebetween to inhibit reaction between exhaust gas components and the metallic base.
Inventors
- 👤 John Edward Chart
- 👤 Burton Bower Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:25
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/0215; B01J37/0225; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/64; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J37/024; B01J37/0244; B01J37/34; B01J37/348; B01D2255/00; B01D2255/20; B01D2255/207; B01D2255/20784; B01D2255/90; B01D2255/902; B01D2255/9022; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
IN A CATALYST PARTICULARLY ADAPTED FOR USE IN ABATEMENT OF NOXIOUS MATERIALS IN AUTOMOTIVE EXHAUST, ADAPTED TO OPERATE AT HIGH TEMPERATURE IN THE RANGE OF UP TO ABOUT 930*C. AND HIGHER IN THE PRESENCE OF ONE OR MORE OF OXYGEN, NITROGEN, NITROGEN OXIDES AND PRODUCTS OF COMBUSTION OF HYDROCARBON FUEL AND COMPRISING A STRUCTURE HAVING A SURFACE CATALYTICALLY ACTIVE TO REDUCE NITROGEN OXIDES TO ITS ELEMENTS OR TO OXIDIZE CARBON MONOXIDE AND UNBURNED HYDROCARBONS TO FINAL OXIDATION PRODUCTS AND AN UNDERLYING METALLIC BASE SELECTED FROM THE GROUP CONSISTING OF FORMABLE, WORKABLE STEEL, CHROMIUM STEEL, STAINLESS STEEL, CHROMIUM-CONTAINING NICKEL BASR ALLOYS AND OTHER NON-FERROUS METALS HAVING A MELTING POINT IN EXCESS OF THE TEMPERATURES ENCOUNTERED IN AUTOMOTIVE EXHAUST MANIFOLDS, THE IMPROVEMENT COMPRISING A LAYER OF CHROMIUM OXIDE INTERPOSED BETWEEN SAID CATALYTICALLY ACTIVE SURFACE AND SAID METALLIC BASE TO INHABIT REACTION OF SAID METALLIC BASE WITH SAID OXYGENM NITROGEN, NITROGEN OXIDES AND PRODUCTS OD COMBUSTION OF SAID HYDROCARBON FUEL AT SAID HIGH TEMPERATURES.
Claim 2
Dependent Claim
161 words
IN A CATALYST PARTICULARLY ADAPTED FOR USE IN ABATEMENT OF NOXIOUS MATERIALS IN AUTOMOTIVE EXHAUST, ADAPTED TO OPERATE AT HIGH TEMPERATURE IN THE RANGE OF UP TO ABOUT 930*C. AND HIGHER IN THE PRESENCE OF ONE OR MORE OF OXYGEN, NITROGEN, NITROGEN OXIDES AND PRODUCTS OF COMBUSTION OF HYDROCARBON FUEL AND COMPRISING A STRUCTURE HAVING A SURFACE CATALYTICALLY ACTIVE TO REDUCE NITROGEN OXIDES TO ITS ELEMENTS OR TO OXIDIZE CARBON MONOXIDE AND UNBURNED HYDROCARBONS TO FINAL OXIDATION PRODUCTS AND AN UNDERLYING METALLIC BASE SELECTED FROM THE GROUP CONSISTING OF FORMABLE, WORKABLE STEEL, CHROMIUM STEEL, STAINLESS STEEL, CHROMIUM-CONTAINING NICKEL BASR ALLOYS AND OTHER NON-FERROUS METALS HAVING A MELTING POINT IN EXCESS OF THE TEMPERATURES ENCOUNTERED IN AUTOMOTIVE EXHAUST MANIFOLDS, THE IMPROVEMENT COMPRISING A LAYER OF CHROMIUM OXIDE INTERPOSED BETWEEN SAID CATALYTICALLY ACTIVE SURFACE AND SAID METALLIC BASE TO INHABIT REACTION OF SAID METALLIC BASE WITH SAID OXYGENM NITROGEN, NITROGEN OXIDES AND PRODUCTS OD COMBUSTION OF SAID HYDROCARBON FUEL AT SAID HIGH TEMPERATURES.
Claim 3
Dependent Claim
49 words
A catalyst as in claim 1 wherein the catalytically active surface comprises a metal or one or more oxides of a metal from the group of precious and non-precious groups VIII metals, and alloys and mixtures thereof with one or more of copper, chromium, vanadium, zinc, molybdenum and tungsten.
Claim 4
Dependent Claim
25 words
A catalyst as in claim 1 wherein the chromium oxide layer is the product of oxidation of an essentially unalloyed chromium layer formed by electrodeposition.
Claim 5
Dependent Claim
48 words
A process for producing the improved catalyst of claim 1 comprising enveloping portions of said metallic base exposed to automotive exhaust with a layer essentially unalloyed chromium prior to forming the catalytically active surface thereupon and thereafter oxidizing the chromium prior to dissipation of the layer through diffusion.
Claim 6
Dependent Claim
18 words
A process as in claim 4 wherein the portions of metallic base are enveloped by electrodepositing chromium thereupon.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |