Patent ID: 8921586

Claim:
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.