Patent US5268157A successfully refreshed from Google Patents.
US5268157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of catalytic gas permeable nets and process for oxidizing ammonia
Assignee: DMC2 Degussa Metals Catalysts Cerdec AG
•
Filing: 1992-03-13
•
Granted: 1993-12-07
•
Expires: 2012-03-13
Abstract
Abstract Wires of platinum containing 4 to 12% rhodium or 4 to 12% of palladium and rhodium (4 to 12% being in reference to the sum of palladium and rhodium and not the percent values for each individually) and wires of palladium containing 2 to 15% nickel or 2 to 15% copper or 2 to 15% of nickel and copper (2 to 15% being in reference to the sum of nickel and copper) and having a diameter of 50 to 120 mu m, a tensile strength of 900 to 1050 N/mm2 and an elastic limit of 0.5 to 3% are used for the knitting of round nets for use as catalysts in the oxidation of ammonia and as recovery nets for platinum metals. A flat knitting machine with a gauge of 3.63 to 1.81 mm is also used whereby the loop length is 2 to 6 mm and wherein the loop or width gauge corresponds with the knitting machine gauge so as to provide a loop width of 1.81 to 3.63 mm.
Inventors
- 👤 Siegfried Blass
- 👤 Horst Duebler
- 👤 Thomas Stoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:08
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/50; B01J35/58; C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; C01B21/265; C01B21/267; D; D10; D10B; D10B2101/00; D10B2101/20; D10B2403/00; D10B2403/02; D10B2403/024; D10B2403/0242
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
152 words
A process for the production of gas permeable nets of noble metals for catalytic processes, comprising: knitting wires on a knitting machine with the wires being free of auxiliary thread support during knitting and wherein the wires are formed of a material which is an alloy of; a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 , an elastic limit of 0.5 to 3% and the knitting machine has a gauge of 1.81 to 3.63 mm.
Claim 2
Dependent Claim
152 words
A process for the production of gas permeable nets of noble metals for catalytic processes, comprising: knitting wires on a knitting machine with the wires being free of auxiliary thread support during knitting and wherein the wires are formed of a material which is an alloy of; a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 , an elastic limit of 0.5 to 3% and the knitting machine has a gauge of 1.81 to 3.63 mm.
Claim 3
Dependent Claim
37 words
A process as recited in claim 1, wherein the knitting of the wires includes knitting the wires on a flat knitting machine having a loop length setting for forming loop lengths of between 2 and 6 mm.
Claim 4
Dependent Claim
22 words
A process as recited in claim 2, wherein the knitting of wires includes knitting the wires on a two-bed flat knitting machine.
Claim 5
Dependent Claim
34 words
A process as recited in claim 1, wherein the knitting of wires includes knitting the wires so as to form a net with a weight per unit area of 300 g/m 2 or more.
Claim 6
Dependent Claim
24 words
A process as recited in claim 1, wherein the wires are knitted so as to form a net which has a circular outer periphery.
Claim 7
Dependent Claim
21 words
A process as recited in claim 1, wherein the knitting of the wires includes knitting wires which are in doubled form.
Claim 8
Dependent Claim
128 words
A structure, comprising: a knitted set of wires with the wires being formed of an alloy of: a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3%, and wherein the net is formed so as to have a loop width of 1.81 to 3.63 mm.
Claim 9
Dependent Claim
128 words
A structure, comprising: a knitted set of wires with the wires being formed of an alloy of: a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3%, and wherein the net is formed so as to have a loop width of 1.81 to 3.63 mm.
Claim 10
Dependent Claim
19 words
A structure as recited in claim 7, wherein the net has a loop length of 2 to 6 mm.
Claim 11
Dependent Claim
22 words
A structure as recited in claim 8, wherein said net has a weight per unit area of 300 g/m 2 or more.
Claim 12
Dependent Claim
22 words
A structure as recited in claim 7, wherein said net has a weight per unit area of 300 g/m 2 or more.
Claim 13
Dependent Claim
27 words
A structure as recited in claim 7, wherein said net is circular in shape with a selvedge edge provided over essentially the entire periphery of said net.
Claim 14
Dependent Claim
18 words
A structure as recited in claim 7, wherein said net is formed of knitted wires in doubled form.
Claim 15
Dependent Claim
88 words
A structure as recited in claim 7, wherein the knitted net is formed of an alloy selected from the group consisting of: a) 90% Pt and 10% Rh b) 92% Pt and 8% Pd c) 90% Pt, 5% Pd and 5% Rh d) 88% Pt, 5% Pd and 7% Rh e) 95% Pt and 5% Rh f) 95% Pd and 5% Ni g) 97% Pd and 3% Ni h) 92% Pd and 8% Cu i) 85% Pd and 15% Cu J) 86% Pd, 10% Cu and 4% Ni.
Claim 16
Dependent Claim
150 words
A gas permeable net which is formed by: knitting wires on a knitting machine with the wires being free of auxiliary thread support during knitting and wherein the wires are formed of a material which is an alloy of: a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3%, and wherein the net is formed so as to have a loop width of 1.81 to 3.63 mm.
Claim 17
Dependent Claim
150 words
A gas permeable net which is formed by: knitting wires on a knitting machine with the wires being free of auxiliary thread support during knitting and wherein the wires are formed of a material which is an alloy of: a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3%, and wherein the net is formed so as to have a loop width of 1.81 to 3.63 mm.
Claim 18
Dependent Claim
19 words
A net as recited in claim 14, wherein the net has a loop length of 2 to 6 mm.
Claim 19
Dependent Claim
22 words
A net as recited in claim 14, wherein said net has a weight per unit area of 300 g/mm 2 or more.
Claim 20
Dependent Claim
27 words
A net as recited in claim 14, wherein said net is circular in shape with a selvedge edge provided over essentially the entire circumference of said net.
Claim 21
Dependent Claim
18 words
A net as recited in claim 14, wherein said net is formed of knitted wires in doubled form.
Claim 22
Dependent Claim
134 words
A catalytic process for oxidizing ammonia which comprises: passing ammonia and air through a gas permeable net which comprises knitted wires formed of an alloy of: a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% by weight of nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3%, and wherein said net has a loop width of 1.81 to 3.63.
Claim 23
Dependent Claim
134 words
A catalytic process for oxidizing ammonia which comprises: passing ammonia and air through a gas permeable net which comprises knitted wires formed of an alloy of: a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% by weight of nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3%, and wherein said net has a loop width of 1.81 to 3.63.
Claim 24
Dependent Claim
33 words
A method as recited in claim 19, wherein the passing of gas through the gas permeable net includes forcing ammonia gas past a net having a loop length of 2 to 6 mm.
Claim 25
Dependent Claim
161 words
A process for the production of gas permeable nets of noble metals for catalytic processes, comprising: knitting wires on a knitting machine with the wires being free of auxiliary support during knitting and wherein the wires are formed of a material which is an alloy of; a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% by nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3% and wherein the net is knitted so as to have a weight per unit area of 300 g/m 2 or more.
Claim 26
Dependent Claim
161 words
A process for the production of gas permeable nets of noble metals for catalytic processes, comprising: knitting wires on a knitting machine with the wires being free of auxiliary support during knitting and wherein the wires are formed of a material which is an alloy of; a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% by nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3% and wherein the net is knitted so as to have a weight per unit area of 300 g/m 2 or more.
Claim 27
Dependent Claim
125 words
A structure, comprising: a knitted net of wires with the wires being formed of an alloy of: a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3%, and the net has a weight per unit area of 300 g/m 2 or more.
Claim 28
Dependent Claim
125 words
A structure, comprising: a knitted net of wires with the wires being formed of an alloy of: a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3%, and the net has a weight per unit area of 300 g/m 2 or more.
Claim 29
Dependent Claim
148 words
A gas permeable net which is formed by: knitting wires on a knitting machine with the wires being free of auxiliary thread support during knitting and wherein the wires are formed of a material which is an alloy of: a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3%, and wherein said net has a weight per unit area of 300 g/m 2 or more.
Claim 30
Dependent Claim
148 words
A gas permeable net which is formed by: knitting wires on a knitting machine with the wires being free of auxiliary thread support during knitting and wherein the wires are formed of a material which is an alloy of: a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3%, and wherein said net has a weight per unit area of 300 g/m 2 or more.
Claim 31
Dependent Claim
135 words
A catalytic process for oxidizing ammonia which comprises: passing ammonia and air through a gas permeable net which comprises knitted wires formed of an alloy of: a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3% and wherein the net has a weight per unit area of 300 g/m 2 or more.
Claim 32
Dependent Claim
135 words
A catalytic process for oxidizing ammonia which comprises: passing ammonia and air through a gas permeable net which comprises knitted wires formed of an alloy of: a) platinum and rhodium containing 4 to 12% by weight of rhodium, b) platinum, palladium and rhodium containing 4 to 12% by weight of palladium and rhodium, c) palladium and nickel containing 2 to 15% nickel, d) palladium and copper containing 2 to 15% by weight of copper, or e) palladium, nickel and copper containing 2 to 15% by weight of nickel and copper, and wherein the wires have a diameter of 50 to 120 μm, a tensile strength of 900 to 1500 N/mm 2 and an elastic limit of 0.5 and 3% and wherein the net has a weight per unit area of 300 g/m 2 or more.
Claim 33
Dependent Claim
17 words
A process as recited in claim 1 wherein knitting the wires includes knitting wires which include palladium.
Claim 34
Dependent Claim
12 words
A structure as recited in claim 7 wherein the wires include palladium.
Claim 35
Dependent Claim
14 words
A gas permeable net as recited in claim 14 wherein the wires include palladium.
Claim 36
Dependent Claim
39 words
A process as recited in claim 19 wherein said passing of ammonia and air through a gas permeable net includes passing ammonia and air through a net having a weight per unit area of 300 g/m 2 or more.
Claim 37
Dependent Claim
25 words
A process as recited in claim 19 wherein passing ammonia and air through said net includes passing ammonia and air through a net containing palladium.
References Cited (Backward Citations)
US1927963A
Cited
FR771524A
Cited
US3189563A
Cited
DE2248811A1
Cited
US3881877A
Cited
DE2829035A1
Cited
DE2855102A1
Cited
GB2062486A
Cited
EP0077121A2
Cited
EP0259966A1
Cited
EP0364153B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |