US5256387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for the production of nitric acid by oxidation of ammonia
Assignee: ADVANCED CATALYST LLC
•
Filing: 1992-11-09
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Granted: 1993-10-26
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Expires: 2012-11-09
Abstract
Abstract Reticulated ceramic or metal substrate coated with Cobalt compounds, noble metals or mixtures thereof are superior catalysts for the oxidation of ammonia to produce nitric oxide.
Inventors
- 👤 Larry E. Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:58
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/0215; B01J23/00; B01J23/70; B01J23/89; B01J23/8913; C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; C01B21/265
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
65 words
A method of preparing nitric oxide comprising contacting ammonia and a free oxygen containing gas in vapor phase in the presence of a catalyst structure for the oxidation of ammonia to produce nitric oxide comprising a substrate of a reticulated ceramic foam or a reticulated metal foam having coated substantially uniformly thereover from 1 to 70 weight % cobalt, a noble metal or mixtures thereof.
Claim 2
Independent Claim
65 words
A method of preparing nitric oxide comprising contacting ammonia and a free oxygen containing gas in vapor phase in the presence of a catalyst structure for the oxidation of ammonia to produce nitric oxide comprising a substrate of a reticulated ceramic foam or a reticulated metal foam having coated substantially uniformly thereover from 1 to 70 weight % cobalt, a noble metal or mixtures thereof.
Claim 3
Dependent Claim
23 words
The method according to claim 1 wherein from about 2 to 20 weight % of said noble metal is coated on said substrate.
Claim 4
Dependent Claim
20 words
The method according to claim 2 wherein in said noble metal is Pt, Pd, Rh, Ru, Os or mixtures thereof.
Claim 5
Dependent Claim
13 words
The method according to claim 1 wherein said substrate is coated substantially continuously.
Claim 6
Dependent Claim
16 words
The method according to claim 3 wherein said metal coating on said substrate is electrically conductive.
Claim 7
Dependent Claim
11 words
The method according to claim 1 wherein said coating comprises platinum.
Claim 8
Independent Claim
59 words
A method of preparing nitric oxide comprising contacting ammonia and a free oxygen containing gas in vapor phase in the presence of a catalyst structure for the oxidation of ammonia to produce nitric oxide comprising a substrate of a reticulated ceramic foam or a reticulated metal foam having coated substantially uniformly thereover from 15 to 30 weight % cobalt.
Claim 9
Independent Claim
59 words
A method of preparing nitric oxide comprising contacting ammonia and a free oxygen containing gas in vapor phase in the presence of a catalyst structure for the oxidation of ammonia to produce nitric oxide comprising a substrate of a reticulated ceramic foam or a reticulated metal foam having coated substantially uniformly thereover from 15 to 30 weight % cobalt.
Claim 10
Independent Claim
82 words
A method of preparing nitric acid comprising: (a) contacting ammonia and a free oxygen containing gas in vapor phase in the presence of a catalyst structure for the oxidation of ammonia to produce nitric oxide comprising a substrate of reticulated ceramic foam or reticulated metal foam having coated substantially continuously thereover from 1 to 70 weight % Co, Pt, Pd, Rh or mixtures thereof to produce a vaporous reaction product containing nitric oxide and (b) contacting said vaporous reaction product with water.
Claim 11
Independent Claim
82 words
A method of preparing nitric acid comprising: (a) contacting ammonia and a free oxygen containing gas in vapor phase in the presence of a catalyst structure for the oxidation of ammonia to produce nitric oxide comprising a substrate of reticulated ceramic foam or reticulated metal foam having coated substantially continuously thereover from 1 to 70 weight % Co, Pt, Pd, Rh or mixtures thereof to produce a vaporous reaction product containing nitric oxide and (b) contacting said vaporous reaction product with water.
Claim 12
Dependent Claim
23 words
The method according to claim 8 wherein said coating comprises from about 2 to 20 weight % Pt, Pd, Rh or mixtures thereof.
Claim 13
Dependent Claim
16 words
The method according to claim 8 wherein said metal coating on said substrate is electrically conductive.
Claim 14
Dependent Claim
11 words
The method according to claim 8 wherein said coating comprises platinum.
Claim 15
Independent Claim
76 words
A method of preparing nitric acid comprising: (a) contacting ammonia and a free oxygen containing gas in vapor phase in the presence of a catalyst structure for the oxidation of ammonia to produce nitric oxide comprising a substrate of reticulated ceramic foam or reticulated metal foam having coated substantially continuously thereover from 15 to 30 weight % cobalt to produce a vaporous reaction product containing nitric oxide and (b) contacting said vaporous reaction product with water.
Claim 16
Independent Claim
76 words
A method of preparing nitric acid comprising: (a) contacting ammonia and a free oxygen containing gas in vapor phase in the presence of a catalyst structure for the oxidation of ammonia to produce nitric oxide comprising a substrate of reticulated ceramic foam or reticulated metal foam having coated substantially continuously thereover from 15 to 30 weight % cobalt to produce a vaporous reaction product containing nitric oxide and (b) contacting said vaporous reaction product with water.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-10-25 | 1997-04-26 | 1997-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-25 | 2001-04-26 | 2001-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-25 | 2005-04-26 | 2005-10-26 | $7700.00 | Window Closed / Lapsed |