Claims
- 1. A composition of matter, which is active as a catalyst for the oxidation of carbon monoxide, comprising hydrotalcite as support material, platinum metal and iron oxide.
- 2. A composition of matter in accordance with claim 1, wherein said support material is a hydrotalcite having the chemical formula of Mg.sub.4.5 Al.sub.2 (OH).sub.13 CO.sub.3.3.5 H.sub.2 O.
- 3. A composition of matter in accordance with claim 1, wherein said catalyst composition contains about 0.5 to about 5 weight percent Pt and about 0.1 to about 4 weight percent Fe.
- 4. A composition of matter in accordance with claim 1, wherein said catalyst composition contains about 1 to about 3 weight percent Pt and about 0.2 to 2 weight percent Fe.
- 5. A composition of matter in accordance with claim 1 consisting essentially of hydrotalcite as support material, platinum metal and iron oxide.
- 6. A composition of matter in accordance with claim 1 having been prepared by a process comprising the steps of
- (a) contacting a support material comprising hydrotalcite with a solution having a pH of at least about 5 and comprising at least one dissolved platinum compound and at least one dissolved iron compound;
- (b) heating the material obtained in step (a) under such conditions as to substantially dry said material obtained in step (a) and to at least partially convert said at least one platinum compound to at least one substance selected from the group consisting of platinum oxides and platinum metal, and to at least partially convert said at least one iron compound to iron oxide; and
- (c) heating the material obtained in step (b) in a reducing gas atmosphere, under such conditions as to form said composition of matter.
- 7. A composition of matter in accordance with claim 6, wherein said conditions in step (c) comprise a temperature in the range of from about 50.degree. C. to about 450.degree. C.
- 8. A composition of matter in accordance with claim 6, wherein said reducing gas atmosphere is selected from the group consisting of a free hydrogen containing gas and a carbon monoxide containing gas.
- 9. A composition of matter in accordance with claim 6, wherein step (c) is carred out in a stream of hydrogen gas at a temperature in the range of from about 100.degree. to about 300.degree. C., for a period of time in the range of from about 0.5 to 10 hours.
- 10. A composition of matter in accordance with claim 6, wherein said support material is a hydrotalcite having the chemical formula Mg.sub.4.5 Al.sub.2 (OH).sub.13 CO.sub.3.3.5 H.sub.2 O.
- 11. A composition of matter in accordance with claim 6, wherein heating step (b) is carried out at a temperature of about 200.degree.-400.degree. C.
- 12. A composition of matter in accordance with claim 6, wherein said heating step (b) is carried out in a free oxygen containing gas atmosphere.
- 13. A composition of matter in accordance with claim 6, wherein the pH of said solution used in step (a) has a pH of about 6-8.
- 14. A composition of matter in accordance with claim 6, wherein said at least one platinum compound is Pt(NH.sub.3).sub.4 (NO.sub.3).sub.2 and said at least one iron compound is Fe(II) acetylacetonate.
- 15. A composition of matter in accordance with claim 1 having been prepared by a process comprising the steps of
- (a) contacting a support material comprising hydrotalcite with a solution having a pH of at least about 5 and comprising at least one dissolved platinum compound;
- (b) heating the material obtained in step (a) under such conditions as to substantially dry said material obtained in step (a) and to at least partially convert said at least one platinum compound to at least one substrate selected from the group consisting of platinum oxides and platinum metal;
- (a*) impregnating the material obtained in step (b) with a solution comprising at least one dissolved iron compound;
- (b*) heating the material obtained in step (a*) under such conditions as to substantially dry said material obtained in step (a*) and to at least partially convert said at least one iron compound to iron oxide; and
- (c) heating the material obtained in step (b*) in a reducing gas atmosphere, under such conditions as to form said composition of matter.
- 16. A composition of matter in accordance with claim 15, wherein said conditions in step (c) comprise a temperature in the range of from about 50.degree. to about 450.degree. C.
- 17. A composition of matter in accordance with claim 15, wherein said reducing gas atmosphere is selected from the group consisting of a free hydrogen containing gas and a carbon monoxide containing gas.
- 18. A composition of matter in accordance with claim 15, wherein step (c) is carried out in a steam of hydrogen gas at a temperature in the range of from about 100.degree. to about 300.degree. C., for a period of time in the range of from about 0.5 to about 10 hours.
- 19. A composition of matter in accordance with claim 15, wherein said support material is a hydrotalcite having the chemical formula Mg.sub.4.5 Al.sub.2 (OH).sub.13 CO.sub.3.3.5 H.sub.2 O.
- 20. A composition of matter in accordance with claim 15, wherein steps (b) and (b*) are carried out at a temperature of about 200.degree.-400.degree. C.
- 21. A composition of matter in accordance with claim 15, wherein heating steps (b) and (b*) are carried out in a free oxygen containing gas atmosphere.
- 22. A composition of matter in accordance with claim 15, wherein the pH of said solution used in step (a) has a pH in the range of from about 6-8.
- 23. A composition of matter in accordance with claim 15, wherein said at least one platinum compound is Pt(NH.sub.3).sub.4 (NO.sub.3).sub.2 and said at least one iron compound is Fe(II) acetylacetonate.
- 24. A process comprising the steps of
- (a) contacting a support material comprising hydrotalcite with a solution having a pH of at least about 5 and comprising at least one dissolved compound of at least one noble metal selected from the group consisting of platinum and palladium; and
- (b) heating the material obtained in step (a) under such conditions as to substantially dry said material in step (a) and to at least partially convert said at least one compound of at least one noble metal to at least one substance selected from the group consisting of oxides of Pt, oxides of Pd, Pt metal and Pd metal.
- 25. A process in accordance with claim 24 comprising the additional step of
- (c) heating the material obtained in step (b) in a reducing gas atmosphere at a temperature in the range of from about 50.degree. to about 450.degree. C. for about 0.5 to about 10 hours.
- 26. A process in accordance with claim 25, wherein said reducing gas atmosphere is selected from the group consisting of a free hydrogen containing gas and a carbon monoxide containing gas.
- 27. A process in accordance with claim 25, wherein step (c) is carried out in a stream of hydrogen gas at a temperature in the range of from about 100.degree.to about 300.degree. C.
- 28. A process in accordance with claim 24, wherein said support material is a hydrotalcite having the formula Mg.sub.4.5 Al.sub.2 (OH).sub.13 CO.sub.3.3.5 H.sub.2 O, and said noble metal is platinum.
- 29. A process in accordance with claim 24, wherein heating step (b) is carried out at a temperature of about 200.degree.-400.degree. C.
- 30. A process in accordance with claim 24, wherein said heating step (b) is carried out in a free oxygen containing gas atmosphere.
- 31. A process in accordance with claim 24, wherein said solution used in step (a) is aqueous and has a pH of about 6-8.
- 32. A process in accordance with claim 24, wherein said solution used in step (a) further comprises at least one iron compound, and said at least one iron compound is at least partially converted to iron oxide in step (b).
- 33. A process in accordance with claim 32, wherein the material obtained in step (b) is subsequently heated in a reducing gas atmosphere at a temperature in the range of from about 50.degree. to about 450.degree. C. for about 0.5 to about 10 hours.
- 34. A process in accordance with claim 24, wherein said process further comprises the steps of
- (a*) impregnating the material obtained in step (b) with a solution comprising at least one iron compound, and
- (b*) heating the material obtained in step (a*) under such conditions as to substantially dry said material obtained in step (a*) and to at least partially convert said at least one iron compound to iron oxide.
- 35. A process in accordance with claim 34 wherein the material obtained in step (b*) is subsequently heated in a reducing gas atmosphere at a temperature in the range of from about 50.degree. to about 450.degree. C. for about 0.5 to about 10 hours.
Parent Case Info
This application is a division of application Ser. No. 160,721, filed Feb. 26, 1988, now allowed.
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0116785 |
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EPX |
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Divisions (1)
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Number |
Date |
Country |
Parent |
160721 |
Feb 1988 |
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