Oxidation State of Vanadium and Role of Titania as the Support for Catalytic Reduction of Nitrogen Monoxide with Ammonia

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  • SHIKADA Tsutomu
    Department of Synthetic Chemistry, Faculty of Engineering, University of Tokyo
  • OGAWA Hideki
    Department of Synthetic Chemistry, Faculty of Engineering, University of Tokyo
  • FUJIMOTO Kaoru
    Department of Synthetic Chemistry, Faculty of Engineering, University of Tokyo
  • TOMINAGA Hiro-o
    Department of Synthetic Chemistry, Faculty of Engineering, University of Tokyo

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Other Title
  • 酸化バナジウム(V)系触媒上での一酸化窒素のアンモニア還元反応におけるバナジウムの酸化状態およびチタニアの効果

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In order to elucidate the catalysis of nitrogen monoxide reduction with ammonia, the changes in oxidation state by the reaction of vanadium supported on silica, titania, and titania coated-silica were studied by use of ESR spectroscopy. The catalysis of the vanadium oxide was found to be inherently correlated with the redox mechanism: V5+ was reduced by NO-NE3reaction to V4+ which was reoxidized by oxygen to V5+. The activity of the supported vanadium oxide was inferred to be mainly determined both by the amount of the effective vanadium ion shuttling between V5+ and V4+ and by the rate of the reoxidation of V4+ to V5+by oxygen. These two factors were markedly affected by the supports: with titania-supported catalyst the amount of the effective vanadium species was large and the rate of reoxidation of vanadium was high compared with the other two catalysts. The increase in the catalytic activity by treating the silica surface with titania was attributed to the increases both in the amount of the effective vanadium species and in the rate of reoxidation of vanadium.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1983 (1), 141-146, 1983-01-10

    The Chemical Society of Japan

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