US3873471A
Expired / Lapsed
US
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Catalysts and their production
Assignee: Evonik Operations GmbH
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Filing: 1973-03-23
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Granted: 1975-03-25
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Expires: 1993-03-23
Abstract
Abstract Catalyst for the purification of pollutant exhaust gases produced by industrial processes and motor vehicles, by conversion of impurities contained therein to carbon dioxide and water and removal of nitrogen oxides at elevated temperatures in contact with air, comprises a hard-baked mixture of eta and gamma aluminum oxide and a mix of the oxides of chromium and at least one element of the first transition series, wherein the chromium oxide and oxide of the element of the First Transition Series comprises more than 50% by weight of the mixture with aluminum oxide. The catalyst may take the form of molded bodies which bodies are formed completely of catalytically active aluminum oxides containing said oxides of chromium and of an element of the First Transition Series.
Inventors
- 👤 Edgar Koberstein
- 👤 Eduard Lakatos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:24
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; B01J23/32; B01J23/34; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/89; B01J23/8933; B01J23/8993; B01J37/00; B01J37/0009; B01J37/0018; B01J37/08; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
86 words
A CATALYST COMPOSITION FOR PURIFYING EXHAUST GASES FROM MOTOR VEHICLES AND INDUSTRIAL PLANTS, SAID COMPOSITION IN THE FORM OF A MOLDED ELEMENT, WHICH ELEMENT COMPRISES A MONOLITHIC SYSTEM OF A MIXED CATALYST THROUGH WIHCH AT LEAST ONE CHANNEL PASSES, SAID MIXED CATALYST COMPRISING A MIXTURE OF (A) CATALYTICALLY ACTIVE ALUMINUM OXIDE, AND (B) MORE THAN 50% BY WEIGHT OF SAID MIXTURE CONSISTING OF TWO COMPONENTS, THE FIRST COMPONENT BEING CHROMIUM OXIDE AND THE SECOND COMPONENT BEING AN OXIDE OF ANOTHER ELEMENT OF THE FIRST TRANSITION SERIES.
Claim 2
Dependent Claim
86 words
A CATALYST COMPOSITION FOR PURIFYING EXHAUST GASES FROM MOTOR VEHICLES AND INDUSTRIAL PLANTS, SAID COMPOSITION IN THE FORM OF A MOLDED ELEMENT, WHICH ELEMENT COMPRISES A MONOLITHIC SYSTEM OF A MIXED CATALYST THROUGH WIHCH AT LEAST ONE CHANNEL PASSES, SAID MIXED CATALYST COMPRISING A MIXTURE OF (A) CATALYTICALLY ACTIVE ALUMINUM OXIDE, AND (B) MORE THAN 50% BY WEIGHT OF SAID MIXTURE CONSISTING OF TWO COMPONENTS, THE FIRST COMPONENT BEING CHROMIUM OXIDE AND THE SECOND COMPONENT BEING AN OXIDE OF ANOTHER ELEMENT OF THE FIRST TRANSITION SERIES.
Claim 3
Dependent Claim
17 words
The catalyst composition of claim 1, wherein said aluminum oxide is a mixture of eta, gamma-aluminum oxide.
Claim 4
Dependent Claim
15 words
The catalyst composition of claim 1 wherein said element further includes a noble metal oxide.
Claim 5
Dependent Claim
22 words
The catalyst composition of claim 1 wherein the element of the First Transition Series includes vanadium, manganese, iron, cobalt, nickel or copper.
Claim 6
Dependent Claim
29 words
The composition of cLaim 1 which further includes another oxide of an element of the First Transition Series on the surface and in the pores of said monolithic system.
Claim 7
Dependent Claim
16 words
A packing for an exhaust purifier system, comprising a plurality of molded elements of claim 1.
Claim 8
Dependent Claim
127 words
A process of forming a mixed catalyst composition for purifying exhaust gases from motor vehicles and industrial plants, said composition comprising a. preparing a mixture of chromium oxide and an oxide of another element of the First Transition Series; b. mixing said chromium oxide and oxide of an element of the First Transition Series with a catalytically active aluminum oxide so that the oxides of chromium and the element of the First Transition Series comprise more than 50% by weight of the aluminum oxide metal oxide compound mixture; c. molding said aluminum oxide-chromium oxide-metal oxide of an element of the First Transition Series into a discrete element through which at least one channel passes, whereby the element so produced is a body of hard-baked catalytically active components.
Claim 9
Dependent Claim
127 words
A process of forming a mixed catalyst composition for purifying exhaust gases from motor vehicles and industrial plants, said composition comprising a. preparing a mixture of chromium oxide and an oxide of another element of the First Transition Series; b. mixing said chromium oxide and oxide of an element of the First Transition Series with a catalytically active aluminum oxide so that the oxides of chromium and the element of the First Transition Series comprise more than 50% by weight of the aluminum oxide metal oxide compound mixture; c. molding said aluminum oxide-chromium oxide-metal oxide of an element of the First Transition Series into a discrete element through which at least one channel passes, whereby the element so produced is a body of hard-baked catalytically active components.
Claim 10
Dependent Claim
16 words
The process of claim 7 wherein the element is further impregnated with a noble metal salts.
Claim 11
Dependent Claim
25 words
The process of claim 7 which further includes impregnating said element with an impregnant including a salts of an element of the First Transition Series.
Claim 12
Dependent Claim
19 words
The process of claim 7 wherein said catalytically active aluminum oxide is a mixture of eta and gamma aluminum.
Claim 13
Dependent Claim
56 words
The process of claim 7 wherein said mixtures of oxides of chromium oxide and an oxide of another element of the First Transition Series is prepared by precipitating a salt of chromium in the presence of a salt of an element of the First Transition Series, drying the precipitate, comminuting the precipitate and calcining the precipitate.
Claim 14
Dependent Claim
11 words
The process of claim 7 wherein molding is effected by extrusion.
Claim 15
Dependent Claim
14 words
The process of claim 11 wherein said aluminum oxide is in the paste form.
Claim 16
Dependent Claim
17 words
The process of claim 11 wherein said precipitate is comminuted to particle sizes less than 70 microns.
Claim 17
Dependent Claim
18 words
The process of claim 11 wherein said precipitate is comminuted to particle sizes of less than 60 microns.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |