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US4124536A
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Catalyst for reducing nitrogen oxides
Assignee: Tonen General Sekiyu KK
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Filing: 1976-07-13
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Granted: 1978-11-07
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Expires: 1996-07-13
Abstract
Abstract Nitrogen oxides are removed from gaseous mixtures comprising the same by contacting with a catalyst comprising a base metal component carried on a silica-alumina base in the presence of ammonia.
Inventors
- 👤 Takuji Itoh
- 👤 Satoshi Sakurada
- 👤 Nobuaki Tagaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:50
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/60; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J21/00; B01J21/12; B01J35/61; B01J35/615; B01J35/63; B01J35/635; B01J35/64; B01J35/647; B01J35/651
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
130 words
A catalyst for reducing nitrogen oxides contained in exhaust gases, comprising at least one metal component having activity to reduce nitrogen oxides, said metal components being carried on a silica-alumina or a silica-alumina-containing carrier which contains 5 to 50% by weight of silica and which possesses the following properties: (1) a specific surface area of more than about 300 m 2 /g; (2) a volume of pores having a diameter ranging from 0 to 600 Angstroms less than about 80% of the total volume of pores: (3) a volume of pores having a diameter ranging from 150 to 600 Angstroms more than about 30% of the volume of pores having a diameter ranging from 0 to 600 Angstroms; and (4) a bulk density less than about 0.5 grams per milliliter.
Claim 2
Dependent Claim
130 words
A catalyst for reducing nitrogen oxides contained in exhaust gases, comprising at least one metal component having activity to reduce nitrogen oxides, said metal components being carried on a silica-alumina or a silica-alumina-containing carrier which contains 5 to 50% by weight of silica and which possesses the following properties: (1) a specific surface area of more than about 300 m 2 /g; (2) a volume of pores having a diameter ranging from 0 to 600 Angstroms less than about 80% of the total volume of pores: (3) a volume of pores having a diameter ranging from 150 to 600 Angstroms more than about 30% of the volume of pores having a diameter ranging from 0 to 600 Angstroms; and (4) a bulk density less than about 0.5 grams per milliliter.
Claim 3
Dependent Claim
18 words
The catalyst of claim 1 wherein said carrier contains from about 10 to 25% by weight of silica.
Claim 4
Dependent Claim
22 words
The catalyst of claim 1 wherein the surface area of said reduction catalyst varies between 300 and 500 m 2 per gram.
Claim 5
Dependent Claim
30 words
The catalyst of claim 1 wherein the volume of pores having a diameter ranging from 0 to 600 Angstroms varies from 50 to 80% of the total volume of pores.
Claim 6
Dependent Claim
38 words
The catalyst of claim 1 wherein the volume of pores having a diameter ranging from 150 to 600 Angstroms varies from 30 to 60% of the volume of pores having a diameter ranging from 0 to 600 Angstroms.
Claim 7
Dependent Claim
33 words
A catalyst of claim 1 wherein the metal component comprises a metal, a metal oxide or mixtures thereof, said metal selected from the group consisting of copper, chromium, vanadium, iron and mixtures thereof.
Claim 8
Dependent Claim
19 words
The catalyst of claim 6 wherein said metal component comprises from 1 to 5% by weight of said catalyst.
Claim 9
Dependent Claim
152 words
A catalyst for reducing nitrogen oxides contained in exhaust gases, comprising a metal, metal oxide or mixtures thereof, said metal selected from the group consisting of copper, chromium, vanadium, iron and mixtures thereof, said metals and/or metal oxides being carried on a silica-alumina or a silica-alumina-containing carrier which contains 10 to 25% by wt. of silica and which possesses the following properties: (1) a specific surface area varying between about 300 to 500 m 2 /gm; (2) the volume of pores of said carrier having a diameter ranging from 0 to 600 Angstroms varies between 50 and 80% of the total volume of pores; (3) the volume of pores of said carrier having a diameter ranging from 150 to 600 Angstroms varies from 30 to 60% of the volume of pores having a diameter ranging from 0 to 600 Angstroms; and (4) a bulk density less than about 0.5 gram per milliliter.
Claim 10
Dependent Claim
152 words
A catalyst for reducing nitrogen oxides contained in exhaust gases, comprising a metal, metal oxide or mixtures thereof, said metal selected from the group consisting of copper, chromium, vanadium, iron and mixtures thereof, said metals and/or metal oxides being carried on a silica-alumina or a silica-alumina-containing carrier which contains 10 to 25% by wt. of silica and which possesses the following properties: (1) a specific surface area varying between about 300 to 500 m 2 /gm; (2) the volume of pores of said carrier having a diameter ranging from 0 to 600 Angstroms varies between 50 and 80% of the total volume of pores; (3) the volume of pores of said carrier having a diameter ranging from 150 to 600 Angstroms varies from 30 to 60% of the volume of pores having a diameter ranging from 0 to 600 Angstroms; and (4) a bulk density less than about 0.5 gram per milliliter.
Claim 11
Dependent Claim
11 words
The catalyst of claim 8 wherein said catalyst contains copper oxide.
References Cited (Backward Citations)
US3962071A
Cited
US3993731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |