Claims
- 1. A method for the catalytic reduction of nitric oxide which includes
- a. blending ammonia with a gaseous stream comprising nitric oxide and oxygen, the ammonia added in an amount sufficient to react with the total amount of nitric oxide in a stream to form a blended stream;
- b. placing the blended stream of step (a) in catalytic contact with a pretreated base metal catalyst at a temperature of between about 300.degree. F. to 700.degree. F. to reduce the nitric oxide to nitrogen while preventing the formation of nitrous oxide, the base metal catalyst selected from the group consisting of copper, vanadium, iron and molybdenum and combinations thereof, which catalyst has been pretreated by contact with a gaseous pretreatment stream containing selenium at a temperature of between about 400.degree. F. to 900.degree. F. to form the pretreated catalyst.
- 2. The method of claim 1 wherein the base metal catalyst is selected from the group consiting of copper, vanadium and iron.
- 3. The method of claim 1 wherein said pretreatment stream comprises selenium and 2% hydrogen in helium.
Parent Case Info
This is a division of application Ser. No. 657,541 filed Feb. 12, 1976.
US Referenced Citations (5)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1,271,524 |
Apr 1961 |
FR |
2,436,683 |
Aug 1975 |
DT |
Divisions (1)
|
Number |
Date |
Country |
Parent |
657541 |
Feb 1976 |
|