Abstract
Competitive oxidation of 13C-enriched ethylene and ethylene oxide over Ag-K2SO4-Al2O3catalyst was studied at 146-256 C in the range of O.1 0.5was easily attained in ethylene oxidation with integral reactor.With increasing temperature, long contacting time and decreasing partial pressure of oxygen, fr increased and selectivity of ethylene oxidation decreased contrarily. From these results, the followings were confirmed: i) it was difficult to neglect the term of combustion of ethylene oxide in kinetics of ethylene oxidation, ii) the decrease in selectivity was attributable to reactivity of ethylene oxide.A part of silver glycoxide, which remained on the catalyst surface during the competitive oxidation, was formed from ethylene directly. Based on this result and informations reported in our earlier papers, combustion intermediates of ethylene and ethylene oxide were estimated to be identical. lt was also comfirmed that the magnitude of fr was in the order of PdO> CuO> NiO> Au> Ag-wire> Ag-powder> Ag-K2SO4-powder and the catalyst had high selectivity which gave small value of fr.
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