Patent US4748012A successfully refreshed from Google Patents.
US4748012A
Expired / Lapsed
US
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Process for the reduction of nitrogen oxides
Assignee: Bayer AG
•
Filing: 1987-04-22
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Granted: 1988-05-31
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Expires: 2007-04-22
Abstract
Abstract A process for reducing the nitrogen oxide content in waste gases of combustion installations is disclosed. The present process is a catalytic reduction with ammonia wherein the nitrogen oxide-containing waste gases are conducted past temperature-resistant structures which are coated with a mixture of one or more aluminosiliciates of the faujasite group, silica sol and/or silicates and a copper compound.
Inventors
- 👤 Horst Weber
- 👤 Manfred Mengel
- 👤 Gerhard Beyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:55
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/10; B01J29/14; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J37/00; B01J37/02; B01J37/024; B01J37/0246; B01J37/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A process for reducing the nitrogen oxide content in a waste gas of a combustion installation by catalytic reductions with ammonia and in the presence of an aluminosilicate, the improvement comprising conducting the nitrogen oxide-containing waste gas past temperature-resistant surface structures which are coated to a thickness of 0.1 to 2 mm with a mixture of one or more crystalling aluminosilicate zeolites of the faujasite group, silica sol and/or silicates as binder and a copper compound and the catalytic reduction is carried out in the temperature range of from about 100 to about 250° C.
Claim 2
Dependent Claim
95 words
A process for reducing the nitrogen oxide content in a waste gas of a combustion installation by catalytic reductions with ammonia and in the presence of an aluminosilicate, the improvement comprising conducting the nitrogen oxide-containing waste gas past temperature-resistant surface structures which are coated to a thickness of 0.1 to 2 mm with a mixture of one or more crystalling aluminosilicate zeolites of the faujasite group, silica sol and/or silicates as binder and a copper compound and the catalytic reduction is carried out in the temperature range of from about 100 to about 250° C.
Claim 3
Dependent Claim
17 words
A process according to claim 1, wherein the coating of the surface structures additionally contains glass fibres.
Claim 4
Dependent Claim
22 words
A process according to claim 1, wherein temperature-resistant silicate press plates from the group of calcium silicates are used as surface structures.
Claim 5
Dependent Claim
24 words
A process according to one of claim 1 wherein a zeolite X and/or zeolite Y is used as the zeolite of the faujasite group.
Claim 6
Dependent Claim
25 words
A process according to claim 1, wherein the surface structures are arranged parallel to each other at a distance of from 0.1 to 2 cm.
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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) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |