Patent US4183671A successfully refreshed from Google Patents.
Patent US4287097A successfully refreshed from Google Patents.
US4287097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carrier matrix for catalysts and a process for the production of same
Assignee: Evonik Operations GmbH
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Filing: 1980-02-29
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Granted: 1981-09-01
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Expires: 2000-02-29
Abstract
Abstract An improved carrier matrix for catalysts is described wherein layers are disposed one on top of the other consisting of highly temperature resistant and non-scaling steel formed into a smooth screen into which closed hollow or open supporting profiles of a larger cross section than the screen are woven in or on at parallel distances. Layers of screens provided with profiles may be combined with layers of flat screens or smooth or corrugated sheet metal. The carrier matrix may be coated with a catalytically active carrier such as gamma-aluminum oxide and then receive a coating of a catalytically active metal whereby the resulting product may be used to treat auto exhaust gases for purification.
Inventors
- 👤 Gerhard Fratzer
- 👤 Bernhard Beck
- 👤 Erwin Dold
- 👤 Hans Klebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:50
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/9454; B01J; B01J35/00; B01J35/50; B01J35/58; F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2807; F01N3/2839; F01N3/2853; B01J35/56; F01N2330/00; F01N2330/02; F01N2330/12; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
80 words
In a carrier matrix for catalysts with cross flow effect as well as with an enlarged geometric surface, comprising layers disposed one on top of the other of highly temperature resistant and non-scaling steel, the improvement wherein the layers comprise at least one smooth screen into which at parallel distances and in the direction of the desired flow channels, closed hollow or open supporting profiles of a larger cross section than the screen are woven on or into the screen.
Claim 2
Dependent Claim
80 words
In a carrier matrix for catalysts with cross flow effect as well as with an enlarged geometric surface, comprising layers disposed one on top of the other of highly temperature resistant and non-scaling steel, the improvement wherein the layers comprise at least one smooth screen into which at parallel distances and in the direction of the desired flow channels, closed hollow or open supporting profiles of a larger cross section than the screen are woven on or into the screen.
Claim 3
Dependent Claim
39 words
The carrier matrix of claim 1 wherein the layers include layers of smooth screen or smooth or corrugated sheet metal interchange with layers of smooth screen with closed hollow or open supporting profiles woven in or onto the screen.
Claim 4
Dependent Claim
36 words
The carrier matrix as defined in claim 1, wherein a web of screen provided with the closed hollow or open supporting profiles is wound up into a cylinder with spiral-shaped cross section having numerous flow channels.
Claim 5
Dependent Claim
35 words
The carrier matrix as defined in claim 3 wherein the screen is wound up with another smooth or corrugated web of screen or sheet into a cylinder with spiral-shaped cross section having numerous flow channels.
Claim 6
Dependent Claim
33 words
The carrier matrix as defined in claims 1, 2, 3, or 4 wherein the screen represents a web with a mesh aperture of 0.18-0.025 mm and with a wire gauge of 0.15-0.025 mm.
Claim 7
Dependent Claim
58 words
The carrier matrix as defined in claims 1, 2, 3 or 4 wherein the cross section of the closed hollow or open supporting profile is dimensioned smaller than 5 mm 2 , whereby the cross section to be selected is always determined by the desired dimensions of the flow channels and from the wire gauge of the screen.
Claim 8
Dependent Claim
41 words
The carrier matrix as defined in claims 1, 2, 3 or 4 wherein the individual flow channels formed by the closed hollow or open supporting profiles woven in and creating distances, have a cross section of below 5 mm 2 .
Claim 9
Dependent Claim
42 words
The carrier matrix as defined in claims 1, 2, 3 or 4 wherein the closed hollow or open supporting profiles are spaced apart at least by 1 mm and at most 5 mm in the plane of the web of the screen.
Claim 10
Dependent Claim
40 words
The carrier matrix as defined in claims 1, 2, 3 or 4 wherein the sheet metal, the screen and the closed hollow or open supporting profiles consist of an alloy of iron, chromium, aluminum and possibly also cerium or yttrium.
Claim 11
Dependent Claim
27 words
The carrier matrix as defined in claim 9 wherein the alloy consists of 15% by weight of chromium, 5% by weight of aluminum and the rest iron.
Claim 12
Dependent Claim
38 words
The carrier matrix as defined in claim 9, wherein the alloy consists of 5 to 15% by weight of chromium, 0.5 to 12% by weight of aluminum, 0.1-3% by weight of cerium or yttrium and the rest iron.
Claim 13
Dependent Claim
37 words
The carrier matrix as defined in claims 1, 2, 3 or 4 wherein the individual layers at their periphery and/or face are point-welded or welded altogether with one another or the last layer with the preceding layer.
Claim 14
Dependent Claim
26 words
The carrier matrix as defined in claims 1, 2, 3 or 4 wherein the surface of the layers are coated with a catalysis promoting carrier material.
Claim 15
Dependent Claim
30 words
The carrier matrix as defined in claims 1, 2, 3 or 4 wherein screen layers are disposed as rolled cylinders with spiral-shaped cross section and arranged in a steel jacket.
Claim 16
Dependent Claim
36 words
The carrier matrix as defined in claims 1, 2, 3 or 4 wherein the individual layers wound up spiral-shaped, are secured against shifting by holding rings disposed firmly at the front sides of the steel jacket.
Claim 17
Dependent Claim
50 words
A process for the production of the carrier matrix as defined in claim 1 wherein the surface of the smooth or corrugated layers or the screen web provided with the closed hollow or open supporting profiles is coated prior to rolling into a cylinder with the catalysis promoting carrier material.
Claim 18
Dependent Claim
54 words
The process as in claim 16, wherein the smooth and corrugated layers or the screen web provided with the closed hollow or open supporting profiles are heated in an oxygen containing gas under conditions of temperature and time under which a surface layer of aluminum oxide develops from the aluminum contained in the alloy.
Claim 19
Dependent Claim
54 words
The process as in claim 17 wherein the smooth and corrugated layers or the screen web provided with the closed hollow or open supporting profiles and after development of the aluminum oxide coating, are coated additionally with catalysis promoting carrier material of the same or a different chemical composition in the wash coat process.
Claim 20
Dependent Claim
70 words
The process as in claim 15, wherein the smooth and corrugated layers or the screen web provided with the closed hollow or open supporting profiles are first coated by way of the wash coat process with catalysis promoting carrier material, and the coated material is then heated in an oxygen containing gas under conditions of time and temperature whereby aluminum oxide oxidizes out of the aluminum contained in the alloy.
Claim 21
Dependent Claim
28 words
The process as in claim 15 wherein aluminum oxide is oxidized out from the alloy by heating on the air at temperatures of 750°-1100° C. during 1-7 hours.
Claim 22
Dependent Claim
53 words
The process as in claim 15 wherein the smooth and corrugated layers or the screen web provided with the closed hollow or open supporting profiles are wound up into the cylinder with spiral-shaped cross section and the latter is pressed into a steel jacket under pretension and is possibly welded on in it.
Claim 23
Dependent Claim
29 words
A cylinder-shaped carrier matrix, coated in a fixed adhesive manner with catalysis promoting metal oxide and having a spiral-shaped cross section obtainable according to the process of claim 15.
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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |