Claims
- 1. A catalyst for the vapor-phase oxidation of ethylene to ethylene oxide comprising:
- a porous support having a surface area of about 0.1 to 2.0 m.sup.2 /g and a porosity of about 0.1 to 1.0 cc/g; and
- 3-20 wt % silver dispersed on said support such that there are from 10 to 70 particles of silver per square micron on the fresh catalyst.
- 2. The catalyst according to claim 1 wherein the silver is dispersed on said support such that there are from 10 to 20 particles of silver per square micron.
- 3. The catalyst according to claim 1 further comprising up to about 8.times.10.sup.-3 gew/kg of alkali metal on said support.
- 4. The catalyst according to claim 3 wherein said alkali metal is cesium.
- 5. The catalyst according to claim 1 wherein said support comprises alpha-alumina.
- 6. The catalyst according to claim 5 wherein said support further comprises up to about 15 wt % silica.
- 7. The catalyst according to claim 1 wherein said support has a surface area of 0.4 to 1.6 m.sup.2 /g and a porosity of about 0.2 to 0.7 cc/g.
- 8. The catalyst according to claim 6 wherein said support has a surface area of 0.4 to 1.6 m.sup.2 /g and a porosity of about 0.2 to 0.7 cc/g.
- 9. The catalyst according to claim 7 further comprising up to about 8.times.10.sup.-3 gew/kg of an alkali metal on said support.
- 10. The catalyst according to claim 9 wherein said alkali metal is cesium.
- 11. The catalyst according to claim 10 wherein the cesium content is about 1 to 6.times.10.sup.-3 gew/kg.
- 12. A catalyst for the vapor-phase oxidation of ethylene to ethylene oxide comprising:
- a porous alpha-alumina/silica support having a surface area of about 0.4 to 1.6 m.sup.2 /g and a porosity of about 0.2 to 0.7 cc/g;
- 8-13 wt % silver dispersed on said support such that there are initially from about 10 to 20 particles of silver per square micron; and
- 1to 6.times.10.sup.-3 gew cesium/g on said support.
Parent Case Info
This is a continuation of application Ser. No. 08/024,247, filed Mar. 1, 1993, now U.S. Pat. No. 5,525,740.
US Referenced Citations (13)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0241391 |
Oct 1987 |
EPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
24247 |
Mar 1993 |
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