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Rhenium remains the least understood promoter of silver catalysts for the epoxidation of ethylene. While a large number of patents can be found claiming the use of rhenium to yield ethylene oxide selectivities over 80%, very little is present in the open literature to explain these results. In this work we report initial studies of rhenium promoted Ag and Cu–Ag bimetallic catalysts under chlorine-free...
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