US4314913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for removing NOx from gas streams
Assignee: Rhone Poulenc Industries SA
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Filing: 1980-03-04
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Granted: 1982-02-09
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Expires: 2000-03-04
Abstract
Abstract Nitrogen oxides, NO x , are depleted/removed from oxygen-containing gas streams comprising same, by contacting an admixture of ammonia and such gas streams, at elevated temperatures, with a catalyst which comprises a catalytically active metallic oxide deposited on a porous alumina support, said support comprising a volume of pores having diameters larger than 1000 A in excess of 25 cm 3 /100 g, a volume of pores having diameters larger than 300 A in excess of 40 cm 3 /100 g, a total pore volume of from about 80 cm 3 /100 g to 120 cm 3 /100 g, and a surface area of less than 160 m 2 /g, said catalytically active metallic oxide being an oxide of a metal selected from the group consisting of vanadium, iron and cobalt, and said catalytically active metal oxide comprising from 0.5 to 20% by weight of the catalyst.
Inventors
- 👤 Jean-Yves Derrien
- 👤 Laurent Seigneurin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:09
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/60; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J35/61; B01J35/615; B01J35/63; B01J35/633; B01J35/635; B01J35/64; B01J35/647; B01J35/651
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A catalyst which comprises a catalytically active metallic oxide deposited on a porous support with the metallic oxide being selected from the group consisting of the oxides of vanadium, iron and cobalt and with the metallic oxide comprising from 0.5 to 20% by weight of the catalyst, wherein the improvement comprises said support being a porous alumina support and comprising a volume of pores having diameters larger than 1000 A in excess of 25 cm 3 /100 g, a volume of pores having diameters larger than 300 A in excess of 40 cm 3 /100 g, a total pore volume of from about 80 cm 3 /100 g to 120 cm 3 /100 g, and a surface area of less than 160 m 2 /g.
Claim 2
Dependent Claim
125 words
A catalyst which comprises a catalytically active metallic oxide deposited on a porous support with the metallic oxide being selected from the group consisting of the oxides of vanadium, iron and cobalt and with the metallic oxide comprising from 0.5 to 20% by weight of the catalyst, wherein the improvement comprises said support being a porous alumina support and comprising a volume of pores having diameters larger than 1000 A in excess of 25 cm 3 /100 g, a volume of pores having diameters larger than 300 A in excess of 40 cm 3 /100 g, a total pore volume of from about 80 cm 3 /100 g to 120 cm 3 /100 g, and a surface area of less than 160 m 2 /g.
Claim 3
Dependent Claim
50 words
The catalyst as defined by claim 1, wherein in the support the volume of pores having diameters larger than 1000 A ranges between 25 and 70 cm 3 /100 g, and the volume of pores having diameters larger than 300 A ranges between 43 and 70 cm 3 /100 g.
Claim 4
Dependent Claim
25 words
The catalyst as defined by claims 1 or 2, wherein the surface area of the alumina support ranges between 90 and 150 m 2 /g.
Claim 5
Dependent Claim
20 words
The catalyst as defined by claim 1, wherein the alumina support comprises the crystalline phases γ, θ, δ, and α.
Claim 6
Dependent Claim
22 words
The catalyst as defined by claim 4, said catalytically active metal oxide comprising from 5 to 15% by weight of the catalyst.
Claim 7
Dependent Claim
56 words
The catalyst as defined by claim 4, wherein in the support the volume of pores having diameters larger than 1000 A is about 60 cm 3 /100 g, the volume of pores having diameters larger than 300 A is about 68 cm 3 /100 g, and the surface area thereof is about 150 m 2 /g.
Claim 8
Dependent Claim
60 words
The catalyst as defined by claim 4, wherein in the support the volume of pores having diameters larger than 1000 A is in excess of 30 cm 3 /100 g, the volume of pores having diameters larger than 300 A is in excess of 43 cm 3 /100 g, and the surface area thereof is about 120 m 2 /g.
Claim 9
Dependent Claim
15 words
The catalyst as defined by claim 1, said catalytically active metallic oxide being vanadium oxide.
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) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |