US4179412A
Expired / Lapsed
US
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Process for producing catalyst precursors for decomposing ammonia by oxidation and precursors produced by said process
Assignee: Kanadevia Corp
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Filing: 1978-01-30
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Granted: 1979-12-18
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Expires: 1998-01-30
Abstract
Abstract A catalyst for decomposing ammonia by oxidation is produced by converting the surface layer of steel material of specified shape resembling a ring, honeycomb, plate or the like to an aluminum alloy, treating the steel material with an aluminum dissolving solution to dissolve out the aluminum and to render the surface layer porous, subjecting the steel material to oxidation treatment to obtain a catalyst carrier, and causing the carrier to support platinum.
Inventors
- 👤 Hideya Inaba
- 👤 Yasumi Kamino
- 👤 Shigenori Onizuka
- 👤 Chikashi Inazumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:16
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; C01B21/265; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8634; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/70; B01J23/89; B01J23/8906
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
97 words
A process for producing a catalyst precursor for decomposing NH 3 by oxidation consisting essentially of the steps of converting the surface layer of steel material of specified shape resembling a ring, honeycomb or plate to an aluminum alloy, treating the steel material with an aluminum dissolving solution to dissolve out the aluminum and to render the surface layer porous, subjecting the resulting steel material to oxidation treatment to obtain a catalyst carrier, immersing the carrier in a solution of a platinum compound selected from the group consisting of chroloplatinic acid and platinum sulfate, and drying it.
Claim 2
Dependent Claim
97 words
A process for producing a catalyst precursor for decomposing NH 3 by oxidation consisting essentially of the steps of converting the surface layer of steel material of specified shape resembling a ring, honeycomb or plate to an aluminum alloy, treating the steel material with an aluminum dissolving solution to dissolve out the aluminum and to render the surface layer porous, subjecting the resulting steel material to oxidation treatment to obtain a catalyst carrier, immersing the carrier in a solution of a platinum compound selected from the group consisting of chroloplatinic acid and platinum sulfate, and drying it.
Claim 3
Dependent Claim
27 words
A process as defined in claim 1 wherein the surface layer of the steel material is converted to an aluminum alloy by heat-treating an aluminum-coated steel material.
Claim 4
Dependent Claim
27 words
A process as defined in claim 1 wherein the aluminum is dissolved out by immersing the steel material having the alloy layer in the aluminum dissolving solution.
Claim 5
Dependent Claim
21 words
A process as defined in claim 1 wherein the aluminum dissolving solution is an aqueous solution of an alkali metal hydroxide.
Claim 6
Dependent Claim
16 words
A process as defined in claim 1 wherein the oxidation treatment is conducted under mild conditions.
Claim 7
Dependent Claim
34 words
A process as defined in claim 5 wherein the oxidation treatment is conducted by contacting the porous surface layer of the steel material with a gas containing 0.1 to 20.8% by volume of oxygen.
Claim 8
Dependent Claim
31 words
A process as defined in claim 1 wherein the carrier is immersed in an aqueous solution of chloroplatinic acid having a concentration of 0.01 to 1.0% by weight calculated as platinum.
Claim 9
Dependent Claim
19 words
A precursor for a catalyst for decomposing NH 3 by oxidation produced by the process defined in claim 1.
Claim 10
Dependent Claim
57 words
A process as defined in claim 1 wherein after immersion of the carrier in a solution of a platinum compound, the carrier is fired at a temperature of 300° to 500° C., theresulting platinum-supporting carrier is immersed in a solution of a rhodium compound selected from the group consisting of rhodium chloride and rhodium sulfate, and dried.
Claim 11
Dependent Claim
32 words
A process as defined in claim 9 wherein the platinum-supporting carrier is immersed in an aqueous solution of rhodium chloride having a concentration of 0.01 to 0.5% by weight calculated as rhodium.
Claim 12
Dependent Claim
47 words
A process as defined in claim 1 wherein after immersion of the carrier in a solution of a platinum compound, the carrier is fired at a temperature of 300° to 500° C., is immersed in an aqueous solution or oxalic acid solution of ammonium metavanadate and dried.
Claim 13
Dependent Claim
53 words
A process as defined in claim 1 wherein the carrier is immersed in an aqueous solution or oxalic acid solution of ammonium metavanadate, fired at a temperature of 600° to 700° C., immersed in a solution of a platinum compound selected from the group consisting of chloroplatinic acid and platinum sulfate, and dried.
Claim 14
Dependent Claim
19 words
A precursor for a catalyst for decomposing NH 3 by oxidation produced by the process defined in claim 10.
Claim 15
Dependent Claim
19 words
A precursor for a catalyst for decomposing NH 3 by oxidation produced by the process defined in claim 11.
Claim 16
Dependent Claim
19 words
A precursor for a catalyst for decomposing NH 3 by oxidation produced by the process defined in claim 12.
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) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |