The Mechanism of Competitive Oxidation of Ethylene and Ethylene Oxide over Silver Catalyst --Study by the Use of <SUP>13</SUP>C-tracer-

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  • Ayame Akimi
    Department of Industrial Chemistry, Muroran Institute of Technology
  • Harano Yoshio
    Department of Applied Chemistry, Osaka City University
  • Imoto Tatsuya
    Department of Applied Chemistry, Osaka City University
  • Kano Hisao
    Department of Industrial Chemistry, Muroran Institute of Technology

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Other Title
  • 銀触媒上におけるエチレンとエチレンオキシドの競争酸化反応機構 ―-<SUP>13</SUP>Cトレーサー利用による研究-―
  • The Mechanism of Competitive Oxidation of Ethylene and Ethylene Oxide over Silver Catalyst --Study by the Use of 13C-tracer-

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Description

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< Rp< 3 by a pulse technique, where Rp was the ratio of partial pressure of ethylene to that of ethylene oxide.<BR>The isotope ratio of carbon in carbon dioxide produced was measured and fr (ratio of the amount of carbon dioxide formed from ethylene oxide to all amount of that produced) was determined by it. The value of fr increased with decreasing Rp, and Rp which gave fr> 0.5was easily attained in ethylene oxidation with integral reactor.<BR>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.<BR>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.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1974 (7), 1189-1194, 1974-07-10

    The Chemical Society of Japan

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