US3928238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas purifying catalyst and process of making and using same
Assignee: Evonik Operations GmbH
•
Filing: 1973-10-12
•
Granted: 1975-12-23
•
Expires: 1993-10-12
Abstract
Abstract A process for preparing an oxidic, carrier catalyst comprising at least one heavy metal compound as active component, said process comprising providing a carrier comprising a temperature resistant material with a catalytically active coating by intensively mixing said carrier with a binding agent, and at least one pulverulent, oxidic heavy metal compound or with a pulverulent mass containing at least one of said oxidic heavy metal compounds or at least one hydroxyl group-containing precursor of said heavy metal compounds, and subsequently heating the resulting mass to remove said binding agent. The catalyst and the process of using the catalyst in the purification of exhaust gases are provided.
Inventors
- 👤 Edgar Koberstein
- 👤 Eduard Lakatos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:36
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868; B01J37/00; B01J37/0009; B01J37/0018
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
142 words
A PROCESS FOR PREPARING AN OXIDIC, CARRIER CATALYST, SAID CATALYST COMPRISING AT LEAST NE HEAVY METAL COMPOUND AS ACTIVE COMPONENT, SAID PROCESS COMPRISING PROVIDING A TEMPERATURE RESISTANT CARRIER MATERIAL WITH A CATALYTICALLY ACTIVE COATING WITHOUT SUBSTANTIAL MUTUAL PERMEATION OF SAID COATING AND CARRIER MATERIAL BY: A. INTENSIVELY MIXING SAID CARRIER WITH A BINDING AGENT UNTIL THE SURFACE OF SAID CARRIER IS SLIGHTTLY GLUTINOUS; B. APPLYING TO SSID CARRIER FROM STEP (A) AT LEAST ONE PULVERULENT, OXIDIC, HEAVY METAL COMPOUND, A PULVERULENT MASS CONTAINING AT LEAST ONE OF SAIDOXIDIC HEAVY METAL COMPOUNDS OR AT LEAST ONE HYDROXYL GROUP-CONTAINING PRECURSOR OF SAID HEAVY METAL COMPOUNDS, WHEREIN SAID HEAVY METAL IS SELECTED FROM THE GROUP CONSISTING OF COPPER, CHROMIUM, NICKEL, TITANIUM, VANADIUM, MANGANESE, IRON, COBALT, ZINC, TIN, MOLYBDENUM, TUNGSTEN AND BISMUTH; AND C. HEATING THE RESULTING MASS FROM STEP (B) TO REMOVE SAID BINDING AGENT.
Claim 2
Dependent Claim
142 words
A PROCESS FOR PREPARING AN OXIDIC, CARRIER CATALYST, SAID CATALYST COMPRISING AT LEAST NE HEAVY METAL COMPOUND AS ACTIVE COMPONENT, SAID PROCESS COMPRISING PROVIDING A TEMPERATURE RESISTANT CARRIER MATERIAL WITH A CATALYTICALLY ACTIVE COATING WITHOUT SUBSTANTIAL MUTUAL PERMEATION OF SAID COATING AND CARRIER MATERIAL BY: A. INTENSIVELY MIXING SAID CARRIER WITH A BINDING AGENT UNTIL THE SURFACE OF SAID CARRIER IS SLIGHTTLY GLUTINOUS; B. APPLYING TO SSID CARRIER FROM STEP (A) AT LEAST ONE PULVERULENT, OXIDIC, HEAVY METAL COMPOUND, A PULVERULENT MASS CONTAINING AT LEAST ONE OF SAIDOXIDIC HEAVY METAL COMPOUNDS OR AT LEAST ONE HYDROXYL GROUP-CONTAINING PRECURSOR OF SAID HEAVY METAL COMPOUNDS, WHEREIN SAID HEAVY METAL IS SELECTED FROM THE GROUP CONSISTING OF COPPER, CHROMIUM, NICKEL, TITANIUM, VANADIUM, MANGANESE, IRON, COBALT, ZINC, TIN, MOLYBDENUM, TUNGSTEN AND BISMUTH; AND C. HEATING THE RESULTING MASS FROM STEP (B) TO REMOVE SAID BINDING AGENT.
Claim 3
Dependent Claim
28 words
Process according to claim 1 wherein said precursor is employed and said mass resulting from step (B) is heated to remove said binding agent and calcine said precursor.
Claim 4
Dependent Claim
25 words
Process according to claim 1 wherein at least one of said pulverulent, oXidic, heavy metal compounds or said pulverulent mass is employed in step (B).
Claim 5
Dependent Claim
37 words
A process according to claim 1 in which the carrier is treated with the binding agent, the mixture is agitated until the surface of the carrier is slightly glutinous and the pulverulent component is subsequently applied thereto.
Claim 6
Dependent Claim
22 words
A process according to claim 1 in which the particle size of the pulverulent component is less than about 100 Mu m.
Claim 7
Dependent Claim
23 words
A process according to claim 1 in which the carrier is comprised of aluminum oxide, aluminum oxide hollow bodies or aluminum oxide fibers.
Claim 8
Dependent Claim
20 words
The process according to claim 1 in which oxidic compounds of aluminum or silicon are used as the carrier material.
Claim 9
Dependent Claim
19 words
A process according to claim 7 in which the oxidic compounds of aluminum or silicon are aluminosilicates or mullite.
Claim 10
Dependent Claim
18 words
A process according to claim 1 in which the carrier comprises particles of about 1-10 mm in diameter.
Claim 11
Dependent Claim
18 words
A process according to claim 1 in which the carrier comprises particles of about 2-6 mm in diameter.
Claim 12
Dependent Claim
14 words
A process according to claim 1 in which the mixing is effected by rolling.
Claim 13
Dependent Claim
29 words
A process according to claim 1 in which at least one oxide of copper, chromium, nickel, titanium, vanadium, manganese, iron, cobalt and zinc is used as the active component.
Claim 14
Dependent Claim
23 words
A process according to claim 12 in which said active component oxides are doped with at least one alkali or alkaline earth metal.
Claim 15
Dependent Claim
38 words
A process according to claim 1 in which a calcined mixture of aluminum hydroxide with cuprous chromium oxide doped with barium, which has been impregnated with nickel and salt and subsequently calcined, is used as the active component.
Claim 16
Dependent Claim
48 words
A process according to claim 1 in which as precursor of the active component a dried and ground mixture of aluminum hydroxide with cuprous chromium oxide doped with bariusm, impregnated with nickel salt solution, is used, and the precursor is calcined while the binding agent is being removed.
Claim 17
Dependent Claim
57 words
A process according to claim 1 in which as precursor of the active component, co-precipitated hydroxides of manganese, iron and chromium, optionally doped with alkaline-earth metal, in a mixture with aluminum hydroxide gel, dried aluminum hydroxide or eta , delta -aluminum oxide, is used, and calcining of the precursor is combined with removal of the binding agent.
Claim 18
Dependent Claim
24 words
A process according to claim 12 in which the active component is comprised of at least 50% by weight of oxides of heavy metals.
Claim 19
Dependent Claim
55 words
A process according to claim 12 in which an active component or one of its precursors is impregnated with a solution of a salt of at least one metal selected from the group consisting of palladium, platinum, rhodium, iridium and ruthenium, and wherein the impregnation is subsequently converted to catalytically active metal or metal oxide.
Claim 20
Dependent Claim
26 words
A process according to claim 1 in which the binding agent is glacial acetic acid, lactic acid, glycolic acid, nitric acid, polyvinyl alcohol, or propylene glycol.
Claim 21
Dependent Claim
22 words
A process according to claim 1 in which an aluminum salt thermally decomposable below 500* C. is added to the binding agent.
Claim 22
Dependent Claim
32 words
A process according to claim 1 in which the binding agent and carrier are proportioned in such a manner that the carrier does not form lumps until the surface thereof is glutionous.
Claim 23
Dependent Claim
26 words
A process according to claim 1 in which the carrier material and active component, or its precursor, are used in a weight ratio of about 4-30:1.
Claim 24
Dependent Claim
26 words
A process according to claim 1 in which the carrier material and active component, or its precursor, are used in a weight ratio of about 7-15:1.
Claim 25
Dependent Claim
113 words
In an improved exhaust gas purifying catalyst comprising at least one heavy metal oxide, alkali metal, alkaline earth metal and optionally nobel metal or aluminum oxide, the improvement wherein said catalyst comprises a shaped core of temperature-resistant support material having a coating of catalytically active material, at least 50% by weight of the active material being at least one heavy metal oxide or modified heavy metal oxide, said support material and catalytically active material being in a weight ratio of about 4-30:1 and being without substantial mutual permeation, wherein said heavy metal is selected from the group consisting of copper, chromium, nickel, titanium, vanadium, manganese, iron, cobalt, zinc, tin, molybdenum, tungsten and bismuth.
Claim 26
Dependent Claim
113 words
In an improved exhaust gas purifying catalyst comprising at least one heavy metal oxide, alkali metal, alkaline earth metal and optionally nobel metal or aluminum oxide, the improvement wherein said catalyst comprises a shaped core of temperature-resistant support material having a coating of catalytically active material, at least 50% by weight of the active material being at least one heavy metal oxide or modified heavy metal oxide, said support material and catalytically active material being in a weight ratio of about 4-30:1 and being without substantial mutual permeation, wherein said heavy metal is selected from the group consisting of copper, chromium, nickel, titanium, vanadium, manganese, iron, cobalt, zinc, tin, molybdenum, tungsten and bismuth.
Claim 27
Dependent Claim
12 words
Catalyst according to claim 24 in which the ratio is about 7-15:1.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |