US4512964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming nitric oxide from ammonia
Assignee: Massachusetts Institute of Technology
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Filing: 1984-03-21
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Granted: 1985-04-23
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Expires: 2004-03-21
Abstract
Abstract Nitric oxide is formed by the oxidation of ammonia. An ammonia containing gas is contacted with an oxidation catalyst comprising stainless steel in the presence of oxygen at a temperature between about 500 DEG C. and 1100 DEG C. in order to effect a reaction selectivity of at least 50%.
Inventors
- 👤 Costas G. Vayenas
- 👤 Catherine E. Teague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:44
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; C01B21/265; B; B01; B01J; B01J15/00; B01J15/005; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/883; C01B21/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
The process for oxidizing ammonia to form nitric oxide which comprises passing a feed gas containing ammonia and oxygen at an oxygen to ammonia volume ratio larger than 0.5 in contact with a stainless steel catalyst comprising stainless steel-316 containing 23% chromium, 18% nickel, 2% molybdenum, 0.5% carbon, the balance iron at a temperature between about 500° C. and 1000° C. and recovering nitric oxide produced.
Claim 2
Dependent Claim
66 words
The process for oxidizing ammonia to form nitric oxide which comprises passing a feed gas containing ammonia and oxygen at an oxygen to ammonia volume ratio larger than 0.5 in contact with a stainless steel catalyst comprising stainless steel-316 containing 23% chromium, 18% nickel, 2% molybdenum, 0.5% carbon, the balance iron at a temperature between about 500° C. and 1000° C. and recovering nitric oxide produced.
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) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |