US4152296A
Expired / Lapsed
US
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Process for preparing catalysts for removal of nitrogen oxides
Assignee: Sumitomo Seika Chemicals Co Ltd
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Filing: 1977-12-30
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Granted: 1979-05-01
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Expires: 1997-12-30
Abstract
Abstract A catalyst for removal of nitrogen oxides which shows extremely good catalytic activity and is excellent in durability and is low in the activity of oxidizing SO 2 into SO 3 be prepared at a low cost by impregnating a titanium oxide carrier with a vanadium sulfate, a vanadyl sulfate or a mixture thereof and then reacting a mixed gas consisting of 0.05 to 100% by mole of ammonia and 99.95 to 0% by mole of an inert gas which is inert to both ammonia and vanadium and vanadyl sulfates with the impregnated carrier while the reaction mixture is maintained at a temperature of 300° to 520° C., and preferably 370° to 450° C., or by shaping a mixture of titanium oxide and a vanadium sulfate, a vanadyl sulfate or a mixture thereof into a desired shape and then reacting a mixed gas consisting of 0.05 to 100% by mole of ammonia and 99.95 to 0% by mole of an inert gas which is inert to both ammonia and vanadium and vanadyl sulfates with the shaped mixture while the reaction mixture is maintained at a temperature of 300° to 520° C., and preferably 370° to 450° C.
Inventors
- 👤 Thoru Okabe
- 👤 Saburo Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:04
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
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
109 words
A process for preparing a catalyst for removal of nitrogen oxides which comprises impregnating a titanium oxide carrier with at least 0.1% by weight as vanadium atom based on the weight of said carrier of at least one vanadium compound selected for the group consisting of vanadium sulfates, vanadyl sulfates and a mixture thereof and then reacting a mixed gas consisting of 0.05 to 100% by mole of ammonia and 99.95 to 0% by mole of an inert gas which is substantially inert to both ammonia and vanadium and vanadyl sulfates with the impregnated carrier while the reaction mixture is maintained at a temperature of 300° to 520° C.
Claim 2
Dependent Claim
109 words
A process for preparing a catalyst for removal of nitrogen oxides which comprises impregnating a titanium oxide carrier with at least 0.1% by weight as vanadium atom based on the weight of said carrier of at least one vanadium compound selected for the group consisting of vanadium sulfates, vanadyl sulfates and a mixture thereof and then reacting a mixed gas consisting of 0.05 to 100% by mole of ammonia and 99.95 to 0% by mole of an inert gas which is substantially inert to both ammonia and vanadium and vanadyl sulfates with the impregnated carrier while the reaction mixture is maintained at a temperature of 300° to 520° C.
Claim 3
Dependent Claim
26 words
A process according to claim 1, wherein the reaction is carried out while the reaction mixture is maintained at a temperature of 370° to 450° C.
Claim 4
Dependent Claim
36 words
A process according to claim 1, wherein the titanium oxide carrier is impregnated with said vanadium compound in an amount of 0.1 to 5% by weight as vanadium atom based in the weight of said carrier.
Claim 5
Dependent Claim
30 words
A process according to claim 3, wherein the amount of said vanadium compound impregnated is 0.35 to 1.35% by weight as vanadium atom based on the weight of said carrier.
Claim 6
Dependent Claim
16 words
A process according to claim 1, wherein said vanadium compound is vanadyl sulfate (VOSO 4 ).
Claim 7
Dependent Claim
17 words
A process according to claim 1, wherein said vanadium compound is vanadium (II) sulfate (VSO 4 ).
Claim 8
Dependent Claim
12 words
A process according to claim 1, wherein said inert gas is nitrogen.
Claim 9
Dependent Claim
17 words
A catalyst for removal of nitrogen oxides prepared according to the process as defined in claim 1.
Claim 10
Dependent Claim
23 words
The catalyst of claim 8 which has a pore volume of 0.30-0.45 ml/g and a specific surface are of 20-50 m 2 /g.
Claim 11
Dependent Claim
22 words
The catalyst of claim 8 wherein said catalyst is represented by at least one of the formulas: (TiO.sub.2).sub.n VO or (TiO.sub.2).sub.n VO.sub.2.
Claim 12
Dependent Claim
112 words
A process for preparing a catalyst for removal of nitrogen oxides which comprises shaping a mixture of titanium oxide carrier and at least 0.1% by weight as vanadium atom based the weight of said carrier of at least one vanadium compound selected from the group consisting of vanadium sulfates, vanadyl sulfates and mixture thereof into a desired shape and then reacting a mixed gas consisting of 0.05 to 100% by mole of ammonia and 99.95 to 0% by mole of an inert gas which is substantially inert to both ammonia and vanadium and vanadyl sulfates with the shaped mixture while the reaction mixture is maintained at a temperature of 300° to 520°C.
Claim 13
Dependent Claim
112 words
A process for preparing a catalyst for removal of nitrogen oxides which comprises shaping a mixture of titanium oxide carrier and at least 0.1% by weight as vanadium atom based the weight of said carrier of at least one vanadium compound selected from the group consisting of vanadium sulfates, vanadyl sulfates and mixture thereof into a desired shape and then reacting a mixed gas consisting of 0.05 to 100% by mole of ammonia and 99.95 to 0% by mole of an inert gas which is substantially inert to both ammonia and vanadium and vanadyl sulfates with the shaped mixture while the reaction mixture is maintained at a temperature of 300° to 520°C.
Claim 14
Dependent Claim
26 words
A process according to claim 11, wherein the reaction is carried out while the reaction mixture is maintained at a temperature of 370° to 450° C.
Claim 15
Dependent Claim
35 words
A process according to claim 11, wherein the titanium oxide carrier is mixed with said vanadium compound in an amount of 0.1 to 5% by weight as vanadium atom based the weight of said carrier.
Claim 16
Dependent Claim
30 words
A process according to claim 13, wherein the amount of said vanadium compound mixed is 0.35 to 1.35% by weight as vanadium atom based in the weight of said carrier.
Claim 17
Dependent Claim
16 words
A process according to claim 11, wherein said vanadium compound is vanadyl sulfate (VOSO 4 ).
Claim 18
Dependent Claim
17 words
A process according to claim 11, wherein said vanadium compound is vanadium (II) sulfate (VSO 4 ).
Claim 19
Dependent Claim
12 words
A process according to claim 11, wherein said inert gas is nitrogen.
Claim 20
Dependent Claim
17 words
A catalyst for removal of nitrogen oxides prepared according to the process as defined in claim 11.
Claim 21
Dependent Claim
23 words
The catalyst of claim 18 which has a pore volume of 0.30-0.45 ml/g and a specific surface area of 20-50 m 2 /g.
Claim 22
Dependent Claim
22 words
The catalyst of claim 18 wherein said catalyst is represented by at least one of the formulas: (TiO.sub.2).sub.n VO or (TiO.sub.2).sub.n VO.sub.2.
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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) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |