US4950139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of catalytically reducing NO
Assignee: GEA Group AG
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Filing: 1989-01-17
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Granted: 1990-08-21
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Expires: 2009-01-17
Abstract
Abstract A process is disclosed wherein NO contained in a gas is reduced by means of NH 3 as a reducing agent. A mixture of the NO-containing gas and NH 3 is reacted at 290° to 450° C. in the presence of a catalyst, which comprises a support of SiO 2 and contains 5 to 15% by weight manganese sulfate and iron sulfate. The mole ratio of manganese sulfate and iron sulfate, which is calculated as FeSO 4 , is between 1:10 and 10:1. The support has a pore volume of 0.6 to 1.6 ml/g and an average pore diameter of 10 to 100 nm.
Inventors
- 👤 Wolfgang Fennemann
- 👤 Werner Weisweiler
- 👤 Burkhard Retzlaff
- 👤 Bernd Hochstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:46
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J; B01J27/00; B01J27/02; B01J27/053
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
A process for catalytically reducing NO which is contained in a gas comprising: mixing the NO-containing with NH 3 to form a mixture; and reacting the mixture at a temperature of from 290° C. to 450° C. under normal pressure in the presence of a catalyst which has a support consisting of SiO 2 and contains 5 to 15% by weight manganese sulfate and iron sulfate applied to the support, the iron sulfate being at least one of FeSO 4 and Fe 2 (SO 4 ) 3 , the mole ratio of manganese sulfate to iron sulfate, the latter calculated as FeSO 4 , being between 1:10 and 10:1.
Claim 2
Dependent Claim
109 words
A process for catalytically reducing NO which is contained in a gas comprising: mixing the NO-containing with NH 3 to form a mixture; and reacting the mixture at a temperature of from 290° C. to 450° C. under normal pressure in the presence of a catalyst which has a support consisting of SiO 2 and contains 5 to 15% by weight manganese sulfate and iron sulfate applied to the support, the iron sulfate being at least one of FeSO 4 and Fe 2 (SO 4 ) 3 , the mole ratio of manganese sulfate to iron sulfate, the latter calculated as FeSO 4 , being between 1:10 and 10:1.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein the catalyst contains 0.001 to 0.01 mole Y 2 (SO 4 ) 3 , TiOSO 4 or Zr(SO 4 ) 2 per mole of manganese sulfate or iron sulfate.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein the support has a pore volume of 0.6 to 1.6 ml/g and an average pore diameter of 10 to 100 nm.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the SiO 2 of the support has a purity of 97 to 99.9%.
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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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |