Claims
- 1. A catalyst structure for the oxidation of ammonia to produce nitric oxide consisting essentially of a substrate of reticulated ceramic foam or reticulated metal foam having coated substantially uniformly thereover from 1 to 70 weight % cobalt compound and a minor amount of a zinc compound.
- 2. The catalyst structure according to claim 1 wherein from 15 to 50 weight % cobalt is coated on said substrate.
- 3. The catalyst structure according to claim 1 wherein said substrate has a substantially continuous coating.
- 4. The catalyst structure according to claim 1 wherein said cobalt compound is cobalt oxide.
- 5. The catalyst structure according to claim 4 wherein said zinc compound is zinc oxide.
- 6. The catalyst structure according to claim 4 wherein said zinc compound is present in the amount of about 5%.
- 7. The method of preparing a catalyst structure for the oxidation of ammonia to produce nitric oxide comprising a substrate of reticulated ceramic foam or reticulated metal foam having coated substantially uniformly thereover from 1 to 70 weight % cobalt comprising:
- (a) preparing a first solution comprising an organic solvent and a carboxylate salt of zinc;
- (b) immersing foamed ceramic structure or foamed metal structure in said first solution to cover said substrate with said first solution;
- (c) preparing a second solution comprising an organic solvent and from about 1 to 30 wt.% of a carboxylate salt of cobalt;
- (d) immersing said foamed ceramic structure or foamed metal structure in said second solution to cover said substrate with said second solution;
- (e) removing said solution covered substrate from said solution; and
- (f) heating at 260.degree. to 800.degree. C. for a sufficient time to oxidize said salts to produce a coating over the substrate.
- 8. The method according to claim 7 wherein said first solution contains about 12% of said zinc salt.
- 9. A catalyst structure for the oxidation of ammonia to produce nitric oxide consisting essentially of a substrate of reticulated ceramic foam or reticulated metal foam having coated substantially uniformly thereover from 1 to 70 weight % cobalt compound and 5 weight % zinc compound.
- 10. A method of preparing a catalyst structure for the oxidation of ammonia to produce nitric oxide comprising a substrate of reticulated ceramic foam or reticulated metal foam having coated substantially uniformly thereover from 1 to 70 weight % cobalt, comprising:
- (a) preparing a first solution comprising an organic solvent containing about 12 weight % of a carboxylate salt of zinc;
- (b) immersing foamed ceramic structure or foamed metal structure in said first solution to cover said substrate with said first solution;
- (c) preparing a second solution comprising an organic solvent containing from about 1 to 30 weight % of a carboxylate salt of cobalt;
- (d) immersing said foamed ceramic structure or foamed metal structure in said second solution to cover said substrate with said second solution;
- (e) removing said solution covered substrate from said solution; and
- (f) heating at 260.degree. to 800.degree. C. for a sufficient time to oxidize said salts to produce a coating over the substrate.
Parent Case Info
This application is a continuation of application Ser. No. 08/039,733, filed Mar. 30, 1993, now abandoned, which is a division of application Ser. No. 07/983,042, filed Nov. 30, 1992, now U.S. Pat. No. 5,242,882, which is a division of application Ser. No. 07/881,073, filed May 11, 1992, now U.S. Pat. No. 5,217,939.
US Referenced Citations (20)
Non-Patent Literature Citations (2)
Entry |
College Dictionary, Rev. ed. (1982), Random House, Inc., p. 851. |
Farranti et al, "Ammonia Oxidation Catalyst with Enhanced Activity", Ind. Eng. Chem. Rev., vol. 29, No. 7, 1990, pp. 1125-1129. |
Divisions (2)
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Number |
Date |
Country |
Parent |
983042 |
Nov 1992 |
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Parent |
881073 |
May 1992 |
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Continuations (1)
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Number |
Date |
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Parent |
39733 |
Mar 1993 |
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