Claims
- 1. In a process comprising selectively hydrogenating diolefinic hydrocarbons in contact with a catalyst, the improvement wherein the catalyst is produced by a process consisting essentially of the sequential steps of: admixing a palladium compound with an inorganic carrier, roasting in the presence of an oxygen-containing gas, treating with a reducing agent, admixing a halogenated gold compound with the resultant composition, treating with a reducing agent, washing with an aqueous solution of a compound having a basic reaction so as to lower the halogen content of the catalyst below 10 ppm by weight, and roasting in the presence of an oxygen-containing gas, the palladium and gold compounds being used in amounts such that the resultant catalyst contains 0.03 to 1% palladium and 0.003 to 0.3% gold by weight.
- 2. A process according to claim 1 wherein the compound having a basic reaction is ammonia, an amine or an ammonium, sodium or potassium carbonate or bicarbonate.
- 3. A process according to claim 1 wherein the compound having a basic reaction is ammonia.
- 4. A process according to claim 1 wherein the roasting steps are effected at 100.degree.-500.degree. C.
- 5. A process according to claim 1 wherein the reducing agent is hydrogen, used at 100.degree.-400.degree. C.
- 6. A process according to claim 1 wherein the reducing agent is formic acid or hydrazine, used at 10.degree.-100.degree. C.
- 7. A process according to claim 1 wherein palladium is introduced as the acetylacetonate.
- 8. A process according to claim 1 wherein the carrier is an alumina having a surface of between 1 and 100 m.sup.2 /g.
- 9. A process according to claim 1 wherein the catalyst is obtained by admixing a palladium compound with an inorganic carrier, roasting at 100.degree.-500.degree. C. in the presence of an oxygen-containing gas, treating with a reducing agent selected from formic acid, hydrazine and hydrogen, admixing a halogenated gold compound with the resultant composition, treating with formic acid or hydrazine as reducing agent at 10.degree.-100.degree. C., washing with an aqueous solution of a compound having a basic reaction selected from ammonia, an amine and an ammonium sodium or potassium carbonate or bicarbonate, so as to lower the halogen content of the catalyst below 10 ppm by weight, and roasting at 100.degree.-500.degree. C. in the presence of an oxygen-containing gas, the palladium and gold compounds being used in sufficient amounts to provide the resultant catalyst with 0.03 to 1% palladium and 0.003 to 0.3% gold by weight.
- 10. A process according to claim 1 wherein the catalyst is obtained by admixing a palladium compound with an inorganic carrier, roasting at 100.degree.-500.degree. C. in the presence of an oxygen-containing gas, treating with a reducing agent selected from formic acid, hydrazine and hydrogen, admixing a halogenated gold compound with the resultant composition, treating with formic acid or hydrazine as reducing agent at 10.degree.-100.degree. C., washing with an aqueous solution of a compound having a basic reaction selected from ammonia, an amine and an ammonium sodium or potassium carbonate or bicarbonate, so as to lower the halogen content of the catalyst below 10 ppm by weight, and roasting at 100.degree.-500.degree. C., in the presence of an oxygen-containing gas, the palladium and gold compounds being used in sufficient amounts to provide the resultant catalyst with 0.03 to 1% palladium and 0.003 to 0.3% gold by weight.
- 11. In a process comprising selectively hydrogenating acetylenic hydrocarbons in contact with a catalyst, the improvement wherein the catalyst is produced by a process consisting essentially of the sequential steps of: admixing a palladium compound with an inorganic carrier, roasting in the presence of an oxygen-containing gas, treating with a reducing agent, admixing a halogenated gold compound with the resultant composition, treating with a reducing agent, washing with an aqueous solution of a compound having a basic reaction so as to lower the halogen content of the catalyst below 10 ppm by weight, and roasting in the presence of an oxygen-containing gas, the palladium and gold compounds being used in amounts such that the resultant catalyst contains 0.03 to 1% palladium and 0.003 to 0.3% gold by weight.
- 12. A process according to claim 11 wherein the compound having a basic reaction is ammonia, an amine or an ammonium, sodium or potassium carbonate or bicarbonate.
- 13. A process according to claim 11 wherein the compound having a basic reaction is ammonia.
- 14. A process according to claim 11 wherein the roasting steps are effected at 100.degree.-500.degree. C.
- 15. A process according to claim 11 wherein the reducing agent is hydrogen, used at 100.degree.-400.degree. C.
- 16. A process according to claim 11 wherein the reducing agent is formic acid or hydrazine, used at 10.degree.-100.degree. C.
- 17. A process according to claim 11 wherein palladium is introduced as the acetylacetonate.
- 18. A process according to claim 11 wherein the carrier is an alumina having a surface of between 1 and 100 m.sup.2 /g.
- 19. A process according to claim 11 wherein the catalyst is obtained by admixing a palladium compound with an inorganic carrier, roasting at 100.degree.-500.degree. C. in the presence of an oxygen-containing gas, treating with a reducing agent selected from formic acid, hydrazine and hydrogen, admixing a halogenated gold compound with the resultant composition, treating with formic acid or hydrazine as reducing agent at 10.degree.-100.degree. C., washing with an aqueous solution of a compound having a basic reaction selected from ammonia, an amine and an ammonium sodium or potassium carbonate or bicarbonate, so as to lower the halogen content of the catalyst below 10 ppm by weight, and roasting at 100.degree.-500.degree. C. in the presence of an oxygen-containing gas, the palladium and gold compounds being used in sufficient amounts to provide the resultant catalyst with 0.03 to 1% palladium and 0.003 to 0.3% gold by weight.
- 20. A process according to claim 11 wherein the catalyst is obtained by admixing a palladium compound with an inorganic carrier, roasting at 100.degree.-500.degree. C. in the presence of an oxygen-containing gas, treating with a reducing agent selected from formic acid, hydrazine and hydrogen, admixing a halogenated gold compound with the resultant composition, treating with formic acid or hydrazine as reducing agent at 10.degree.-100.degree. C., washing with an aqueous solution of a compound having a basic reaction selected from ammonia, an amine and an ammonium sodium or potassium carbonate or bicarbonate, so as to lower the halogen content of the catalyst below 10 ppm by weight, and roasting at 100.degree.-500.degree. C. in the presence of an oxygen-containing gas, the palladium and gold compounds being used in sufficient amounts to provide the resultant catalyst with 0.03 to 1% palladium and 0.003 to 0.3% gold by weight.
Priority Claims (1)
Number |
Date |
Country |
Kind |
82 04477 |
Mar 1982 |
FRX |
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Parent Case Info
This is a division of application Ser. No. 475,651 filed Mar. 15, 1983, U.S. Pat. No. 4,490,481.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3954601 |
Cosyns et al. |
May 1976 |
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Foreign Referenced Citations (2)
Number |
Date |
Country |
1290930 |
Mar 1969 |
DEX |
197807 |
Jul 1978 |
DDX |
Divisions (1)
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Number |
Date |
Country |
Parent |
475651 |
Mar 1983 |
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