US4131643A
Expired / Lapsed
US
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Catalyst for converting nitrogen oxides and method for converting nitrogen oxides in exhaust gases by using said catalyst
Assignee: Kobe Steel Ltd
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Filing: 1977-09-15
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Granted: 1978-12-26
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Expires: 1997-09-15
Abstract
Abstract A catalyst for catalytically reducing nitrogen oxides present in an exhaust gas in the presence of a reducing gas to convert said nitrogen oxides to harmless substances, which comprises a mixture consisting essentially of the oxides of V and Nb.
Inventors
- 👤 Kei Utsunomiya
- 👤 Kazuya Soga
- 👤 Katsunori Shimasaki
- 👤 Yutaka Mito
- 👤 Mamoru Oaki
- 👤 Shigeru Haseba
- 👤 Hiroetu Miki
- 👤 Michiko Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:37
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J23/20; B01J23/70; B01J23/76; B01J23/84; B01J23/847; B01J23/8474; B01J23/85
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
60 words
A method for converting nitrogen oxides present in exhaust gases to harmless substances, which comprises: contacting an exhaust containing nitrogen oxides in the presence of ammonia as a reducing agent at a temperature of 200° to 500° C, and a space velocity of 2,000 to 10,000 hr 1 with a catalyst consisting essentially of the oxides of V and Nb.
Claim 2
Independent Claim
60 words
A method for converting nitrogen oxides present in exhaust gases to harmless substances, which comprises: contacting an exhaust containing nitrogen oxides in the presence of ammonia as a reducing agent at a temperature of 200° to 500° C, and a space velocity of 2,000 to 10,000 hr 1 with a catalyst consisting essentially of the oxides of V and Nb.
Claim 3
Dependent Claim
29 words
The method of claim 1, wheren the ratio of the atom number of Nb to the atom number of V is in the range of from 0.1 to 5.0.
Claim 4
Independent Claim
78 words
A method for converting nitrogen oxides present in exhaust gases to harmless substances, which comprises: contacting an exhaust gas containing nitrogen oxides in the presence of ammonia as a reducing agent at temperature of 200° to 500° C and a space velocity of 2,000 to 100,000 hr -1 with a catalyst consisting essentially of the oxides of V, Nb and at least one element selected from the group consisting of Cu, Ti, Fe, Cr, W, Mo and Ni.
Claim 5
Independent Claim
78 words
A method for converting nitrogen oxides present in exhaust gases to harmless substances, which comprises: contacting an exhaust gas containing nitrogen oxides in the presence of ammonia as a reducing agent at temperature of 200° to 500° C and a space velocity of 2,000 to 100,000 hr -1 with a catalyst consisting essentially of the oxides of V, Nb and at least one element selected from the group consisting of Cu, Ti, Fe, Cr, W, Mo and Ni.
Claim 6
Dependent Claim
32 words
The method of claim 3, wherein the ratio of the total atom number of Nb and said element to the atom of V is in the range of from 0.1 to 5.0.
Claim 7
Independent Claim
62 words
A method for converting nitrogen oxides present in exhaust gases to harmless substances, which comprises: contacting an exhaust gas containing nitrogen oxides in the presence of ammonia as a reducing agent at a temperature of 200° to 500° C and a space velocity of 2,000 to 100,000 hr -1 with a catalyst consisting essentially of the oxides of V, Nb and Ti.
Claim 8
Independent Claim
62 words
A method for converting nitrogen oxides present in exhaust gases to harmless substances, which comprises: contacting an exhaust gas containing nitrogen oxides in the presence of ammonia as a reducing agent at a temperature of 200° to 500° C and a space velocity of 2,000 to 100,000 hr -1 with a catalyst consisting essentially of the oxides of V, Nb and Ti.
Claim 9
Dependent Claim
30 words
The method of claim 3, wherein the ratio of the atom number of said element to the atom number of Nb is in the range of from 0.25 to 99.
Claim 10
Dependent Claim
31 words
The method of claim 5, wherein the atomic ratio of Nb to V is from 0.01 to 0.14 and the atomic ratio of Ti to V is from 0.4 to 0.8.
Claim 11
Dependent Claim
13 words
The method of claim 1, wherein said catalyst is supported on a carrier.
Claim 12
Dependent Claim
13 words
The method of claim 3, wherein said catalyst is supported on a carrier.
Claim 13
Dependent Claim
13 words
The method of claim 5, wherein said catalyst is supported on a carrier.
Claim 14
Dependent Claim
24 words
The method of claim 1, wherein said carrier is formed in a shape of beads, columns, Rashing rings, plates or of a honeycomb structure.
Claim 15
Dependent Claim
24 words
The method of claim 3, wherein said carrier is formed in a shape of beads, columns, Rashing rings, plates or of a honeycomb structure.
Claim 16
Dependent Claim
24 words
The method of claim 5, wherein said carrier is formed in a shape of beads, columns, Rashing rings, plates or of a honeycomb structure.
Claim 17
Dependent Claim
24 words
The method of claim 11, wherein said catalyst components are supported in an amount of 0.1 to 20% by weight based on said carrier.
Claim 18
Dependent Claim
24 words
The method of claim 12, wherein said catalyst components are supported in an amount of 0.1 to 20% by weight based on said carrier.
Claim 19
Dependent Claim
24 words
The method of claim 13, wherein said catalyst components are supported in an amount of 0.1 to 20% by weight based on said carrier.
Claim 20
Dependent Claim
24 words
The method of claim 14, wherein the catalyst components are supported in an amount of 1 to 10% by weight based on the carrier.
Claim 21
Dependent Claim
24 words
The method of claim 15, wherein the catalyst components are supported in an amount of 1 to 10% by weight based on the carrier.
Claim 22
Dependent Claim
24 words
The method of claim 16, wherein the catalyst components are supported in an amount of 1 to 10% by weight based on the carrier.
References Cited (Backward Citations)
US3900428A
Cited
US4010238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |