Abstract
Ethanol oxidation using ozone was investigated over alumina and silica supported molybdenum and manganese oxide catalysts at temperatures from 300 to 550 K by in situ Raman spectroscopy coupled with reactivity tests. On all catalysts ethanol was found to react with ozone at lower temperatures than with oxygen, and also with lower activation energy. However, over the supported molybdenum oxide catalysts the selectivity was predominantly to acetaldehyde, while for the supported manganese oxide catalysts the selectivity was mainly to carbon oxides. In situ Raman spectroscopic studies at various temperatures showed that the difference in the selectivities could be related to the formation of surface carbonate species which was observed only on the supported molybdenum catalysts under reaction conditions.
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