US5064801A
Expired / Lapsed
US
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Process for manufacturing a carbon catalyst
Assignee: Bergwerksverband GmbH
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Filing: 1988-03-10
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Granted: 1991-11-12
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Expires: 2008-03-10
Abstract
Abstract A process for manufacturing a carbon catalyst for use in NO x reduction with ammonia catalyzed by active carbons and active cokes is described. The new carbon catalyst exhibits improved catalytic activity and hence a higher yield in NO. In the manufacturing process, a mixture of ground, oxidized hard coal and binders is moulded, carbonized at temperatures between 700° and 900° C., and then activated with steam at a temperature of 800° to 850° C. for 45 to 100 minutes, until a degree of activation of 5 to 15% is obtained.
Inventors
- 👤 Harald Juntgen
- 👤 Karl Knoblauch
- 👤 Ekkehard Richter
- 👤 Helmut Kuhl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:18
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J; B01J21/00; B01J21/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
105 words
A process for manufacturing a carbon catalyst for NO x -reduction with ammonia, which comprises the steps of: (a) molding ground, oxidized hard coal mixed with a binder; (b) carbonizing the ground, oxidized hard coal mixed with a binder at a temperature between 700° and 900° C. to obtain the carbon catalyst; and (c) following step (b), activating the carbon catalyst at a temperature between 800° and 850° C. with steam over a dwelling time of 45 to 100 minutes so that the carbon catalyst has a mean random reflectance of 4.5 to 5.5% and until an activation degree of 5 to 15% is reached.
Claim 2
Dependent Claim
105 words
A process for manufacturing a carbon catalyst for NO x -reduction with ammonia, which comprises the steps of: (a) molding ground, oxidized hard coal mixed with a binder; (b) carbonizing the ground, oxidized hard coal mixed with a binder at a temperature between 700° and 900° C. to obtain the carbon catalyst; and (c) following step (b), activating the carbon catalyst at a temperature between 800° and 850° C. with steam over a dwelling time of 45 to 100 minutes so that the carbon catalyst has a mean random reflectance of 4.5 to 5.5% and until an activation degree of 5 to 15% is reached.
Claim 3
Dependent Claim
62 words
The process of claim 1 for manufacturing a carbon catalyst for NO x -reduction with ammonia wherein according to step (c) the carbon catalyst is activated at a temperature of 800° C. with steam over a dwelling time of 45 minutes so that the carbon catalyst has a mean random reflectance of 5.5% and until an activative degree of 5.9% is reached.
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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) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |