Claims
- 1. A method of reducing nitrogen oxides in flue gases in the presence of a reducing agent, which comprises exposing the flue gases to an arsenic-resistant catalyst including vanadium and molybdenum in an oxygen lattice with a relatively lower-oxygen phase obtained by reducing a relatively higher-oxygen phase with a general formula V.sub.x Mo.sub.y O.sub.32 and a given structure, where x+y.ltoreq.12 and where x.gtoreq.1 and y.gtoreq.1, and the relatively lower-oxygen phase has the given structure.
- 2. The method according to claim 1, which comprises selecting the reducing agent from the group consisting of ammonia and carbon monoxide.
- 3. The method according to claim 1, which comprises exposing an arsenic-resistant catalyst with a partly reduced molybdenum oxide phase in the exposing step.
- 4. A method of catalytically reducing nitrogen oxides in flue gases, which comprises enriching the flue gases with a reducing agent and exposing the enriched flue gases to an arsenic-resistant catalyst including vanadium and molybdenum in an oxygen lattice having at least one relatively lower-oxygen phase obtained by reducing a relatively higher-oxygen phase with a general formula V.sub.x Mo.sub.y O.sub.32 where x+y.ltoreq.12 and where x.gtoreq.1 and y.gtoreq.1, and a partly reduced molybdenum oxide phase.
- 5. The method according to claim 4, which comprises enriching the flue gases with ammonia or carbon monoxide in the enriching step.
- 6. The method according to claim 4, which comprises moving the flue gases past an arsenic-resistant catalyst having an oxidic support for the phases with at least one material selected from the group consisting of titanium oxide, cordierite, alumina and silica.
Priority Claims (2)
Number |
Date |
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Kind |
40 25 174.8 |
Aug 1990 |
DEX |
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9107237 |
May 1991 |
EPX |
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CROSS-REFERENCE TO RELATED APPLICATION
This application is a divisional of Ser. No. 07/922,182, filed Jul. 30, 1992; now U.S. Pat. No. 5,270,277, which is a continuation-in-part of copending application Ser. No. 740,813, filed Aug. 6, 1991, now abandoned.
US Referenced Citations (3)
Foreign Referenced Citations (3)
Number |
Date |
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0403879 |
Dec 1990 |
EPX |
0470334 |
Feb 1992 |
EPX |
4025174 |
Feb 1992 |
DEX |
Non-Patent Literature Citations (1)
Entry |
Surface Technology, 9 (1979), El-Salaam et al, pp. 195-202 "Studies on the Heterogeneous Oxidation of 1-Butene " (no month). |
Divisions (1)
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Date |
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Parent |
922182 |
Jul 1992 |
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Continuation in Parts (1)
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Number |
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740813 |
Aug 1991 |
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