US4849392A
Expired / Lapsed
US
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Catalyst material for reducing the nitrogen oxides in flue gases
Assignee: Kraftwerk Union AG
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Filing: 1987-03-04
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Granted: 1989-07-18
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Expires: 2007-03-04
Abstract
Abstract A catalyst material for nitrogen oxide reduction in flue gases in the presence of ammonia, comprising hydrothermal titanium dioxide and the additives of vanadium oxide and one or more oxides of the elements tungsten, phosphorus, sulfur, chromium, zirconium, magnesium, copper, cobalt, iron, and uranium, which hydrothermal titanium dioxide and additives material is activated by grinding.
Inventors
- 👤 Erich Hums
- 👤 Dietmar Hein
- 👤 Helmut Schmelz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:35
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22; B01J23/24; B01J23/26; B01J23/30; B01J23/70; B01J23/76; B01J23/84; B01J23/847; B01J23/8472; B01J27/00; B01J27/02; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J37/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A catalyst material for nitrogen oxide reduction in flue gases in the presence of ammonia, comprising hydrothermal titanium oxide and additives of vanadium oxide and one or more oxides of the elements tungsten, phosphorus, sulfur, chromium, zirconium, magnesium, copper, cobalt, iron and uranium, said hydrothermal titanium oxide and additives being activated by grinding in a dissolver-driver mechanism or an attrition mill.
Claim 2
Dependent Claim
61 words
A catalyst material for nitrogen oxide reduction in flue gases in the presence of ammonia, comprising hydrothermal titanium oxide and additives of vanadium oxide and one or more oxides of the elements tungsten, phosphorus, sulfur, chromium, zirconium, magnesium, copper, cobalt, iron and uranium, said hydrothermal titanium oxide and additives being activated by grinding in a dissolver-driver mechanism or an attrition mill.
Claim 3
Dependent Claim
34 words
A catalyst material as defined by claim 1, wherein the elements added in the form of oxides are present in the sum in an amount of up to 30 atom percent, referred to titanium.
Claim 4
Dependent Claim
26 words
A catalyst material as defined by claim 1, wherein the hydrothermal titanium oxide along with the added oxides is ground in a suspension with deionized water.
Claim 5
Dependent Claim
27 words
A catalyst material as defined by claim 1, wherein the hydrothermal titanium oxide along with the added oxides is ground in a suspension with organic ion-forming solvents.
Claim 6
Dependent Claim
28 words
A catalyst material as defined by claim 1, wherein the catalyst material activated by grinding is sintered or calcined, and the sintered of calcined material is ground again.
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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |