Co-modification Improves the Stability of In<sub>2</sub>O<sub>3</sub> Catalyst in Acetylene Semihydrogenation

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  • MA Jiamin
    Institute for Catalysis, Hokkaido University
  • SHIMIZU Ken-ichi
    Institute for Catalysis, Hokkaido University
  • FURUKAWA Shinya
    Institute for Catalysis, Hokkaido University (Present) Div. of Applied Chemistry, Graduate School of Engineering, Osaka University

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  • Co修飾によるアセチレン部分水素化用In<sub>2</sub>O<sub>3</sub>触媒の安定性向上
  • Co-modification Improves the Stability of In₂O₃ Catalyst in Acetylene Semihydrogenation

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Abstract

<p>A series of silica-supported indium oxides (In2O3/SiO2) and Co-modified In2O3/SiO2 (Co/In2O3/SiO2) were prepared by impregnation methods and tested as noble-metal-alternative catalysts for acetylene semihydrogenation. Although In2O3/SiO2 was active for acetylene semihydrogenation, deactivation occurred within a few hours probably due to by-production of poisonous species. When In2O3/SiO2 was further modified with a small amount of Co (0.5 wt%), acetylene conversion and ethylene selectivity retained high levels (approximately 70 %). For the Co/In2O3/SiO2 catalyst, hydrogen pretreatment temperature had strong influence on the catalytic performance, in which reduction by H2 at 250 °C resulted in the best stability. A temperature-programmed reduction study suggested that metallic Co species contributed to inhibiting the formation of poisonous by-products, which allowed to improve the stability in the catalytic performance.</p>

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