Process for the production of an olefin oxide, a 1,2-diol, a 1,2-diol ether, a 1,2-carbonate, or an alkanolamine

1. A process for the epoxidation of an olefin comprising contacting a reactor feed comprising an olefin, oxygen, and carbon dioxide, with a catalyst comprising a carrier and, deposited on the carrier, silver, a rhenium promoter, a potassium promoter, lithium, and cesium; wherein the carbon dioxide is present in the reactor feed in a quantity of at most 3 mole percent based on the total epoxidation reactor feed;

the potassium promoter is deposited on the carrier in a quantity of at least 0.5 mmole/kg, relative to the weight of the catalyst;

the rhenium promoter is deposited on the carrier in a quantity of at least 1.5 mmole/kg, relative to the weight of the catalyst;

lithium and cesium are deposited on the carrier in a combined quantity in the range of from 0.01 to 500 mmole/kg, relative to the weight of the catalyst; and

the carrier contains water leachable potassium in a quantity of less than 55 parts per million by weight, relative to the weight of the carrier.

2. The process as claimed in claim 1 , wherein the quantity of carbon dioxide is less than 2 mole percent based on the total epoxidation reactor feed.

3. The process as claimed in claim 1 , wherein the quantity of carbon dioxide is in the range of from 0.1 to less than 1.5 mole percent based on the total epoxidation reactor feed.

4. The process as claimed in claim 1 , wherein the olefin comprises ethylene.

5. The process as claimed in claim 1 , wherein the quantity of water leachable potassium in the carrier is at most 50 parts per million by weight, relative to the weight of the carrier.

6. The process as claimed in claim 1 , wherein the carrier is a fluoride-mineralized carrier.

7. The process as claimed in claim 1 , wherein the quantity of the potassium promoter deposited on the carrier is at least 1 mmole/kg, relative to the weight of the catalyst.

8. The process as claimed in claim 1 , wherein the quantity of the potassium promoter deposited on the carrier is in the range of from 1 to 15 mmole/kg, relative to the weight of the catalyst.

9. The process as claimed in claim 1 , wherein the catalyst further comprises a further element selected from the group consisting of nitrogen, fluorine, an alkaline earth metal, titanium, hafnium, zirconium, vanadium, thallium, thorium, tantalum, niobium, gallium, germanium, and mixtures thereof.

10. The process as claimed in claim 1 , wherein the catalyst contains water extractable potassium in a quantity in the range of from 1.25 to 10 mmole/kg, relative to the weight of the catalyst.

11. The process as claimed in claim 1 , wherein the quantity of the rhenium promoter deposited on the carrier is in the range of from 1.5 to 50 mmole/kg, relative to the weight of the catalyst.

12. The process as claimed in claim 1 , wherein the catalyst further comprises a rhenium co-promoter selected from the group consisting of tungsten, molybdenum, chromium, sulfur, phosphorous, boron, and mixtures thereof.

13. The process as claimed in claim 1 , wherein the catalyst further comprises a first co-promoter selected from sulfur, phosphorus, boron, and mixtures thereof; and a second co-promoter selected from tungsten, molybdenum, chromium, and mixtures thereof.

14. The process as claimed in claim 13 , wherein the first co-promoter comprises sulfur.

15. The process as claimed in claim 13 , wherein the second co-promoter comprises tungsten.

16. The process as claimed in claim 13 , wherein the second co-promoter comprises molybdenum.

17. The process as claimed in claim 13 , wherein the molar ratio of the rhenium promoter to the second co-promoter is greater than 1.

18. The process as claimed in claim 13 , wherein the first co-promoter is present in a quantity in the range of from 0.2 to 50 mmole/kg, relative to the weight of the catalyst.

19. The process as claimed in claim 13 , wherein the second co-promoter is present in a quantity in the range of from 0.1 to 40 mmole/kg, relative to the weight of the catalyst.

20. The process as claimed in claim 1 , wherein the combined quantity of lithium and cesium deposited on the carrier is in the range of from 0.5 to 100 mmole/kg, relative to the weight of the catalyst.

21. The process as claimed in claim 13 , wherein the first co-promoter is present in a quantity in the range of from 0.2 to 6 mmole/kg, relative to the weight of the catalyst; and the second co-promoter is present in a quantity in the range of from 0.1 to 5 mmole/kg, relative to the weight of the catalyst.