US4473535A
Expired / Lapsed
US
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Process for reducing nitric oxides
Assignee: New England Power Service Co
•
Filing: 1981-10-16
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Granted: 1984-09-25
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Expires: 2001-10-16
Abstract
Abstract A process for reducing nitric oxide with ammonia in the presence of a copper-exchanged mordenite catalyst at a temperature between about 300° F. and 800° F.
Inventors
- 👤 James R. Kittrell
- 👤 Donald L. Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:27
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0611; B06B1/0618; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/9418; B01D2251/00; B01D2251/20; B01D2251/206; B01D2251/2062; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1021; B01D2255/20; B01D2255/207; B01D2255/20761; B01D2255/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
A method for the selective reduction of nitric oxide which comprises: a. blending ammonia with a gaseous stream comprising nitric oxide, oxygen and an inert gas to form a blended stream, and b. contacting the blended stream with a copper-exchanged mordenite catalyst to reduce the nitric oxide at a temperature between about 300° F. and 800° F.
Claim 2
Independent Claim
57 words
A method for the selective reduction of nitric oxide which comprises: a. blending ammonia with a gaseous stream comprising nitric oxide, oxygen and an inert gas to form a blended stream, and b. contacting the blended stream with a copper-exchanged mordenite catalyst to reduce the nitric oxide at a temperature between about 300° F. and 800° F.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the blended stream contacts the catalyst at a temperature between about 700° F. to 800° F.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein between about 50% and 100% of the nitric oxide is reduced.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the catalyst is supported in a matrix.
Claim 6
Dependent Claim
10 words
The method of claim 1 wherein the catalyst is unsupported.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the concentration of ammonia is between about 25 ppm and 500 ppm.
Claim 8
Dependent Claim
26 words
The process of claim 1 wherein the concentration of ammonia is between about 0.9 and 1.3 moles per mole of nitric oxide in said gaseous stream.
References Cited (Backward Citations)
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Cited
US3895094A
Cited
JPS5111063A
Cited
JPS5125472A
Cited
US4220632A
Cited
JPS5169476A
Cited
US4164546A
Cited
US4131568A
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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) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |