Decomposition of Cyclohexanol on the Spinel System CuCr_<2-x>Fe_xO_4

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Abstract

The System CuCr<sub>2−<i>x</i></sub>Fe<sub><i>x</i></sub>O<sub>4</sub> has been studied with a view to correlate the catalytic behavior of spinels on the decomposition of cyclohexanol. All the compositions between 0.0 ≤ <i>x</i> ≤ 1.0 had cubic symmetry and p-type semiconductivity except the compound CuCr<sub>2</sub>O<sub>4</sub> (<i>x</i> = 0.0) which showed tetragonal symmetry. The activation energy for the electronic conduction varied between 0.38 and 0.13 eV. The Seebeck coefficient (<i>α</i>) was found to increase with increases in ‘<i>x</i>’. Catalytic evaluation was done in the temperature range 200—400 °C using cyclohexanol as a probe molecule. Our results show CuCrFeO<sub>4</sub> to be a better catalyst for cyclohexanol decomposition than CuCr<sub>2</sub>O<sub>4</sub>. The percent decomposition of alcohol increased with increases in mobility of charge carriers and decreases in values of activation energy. Further, dehydrogenation selectivity increased with increases in p-type behavior of the compositions from CuCr<sub>2</sub>O<sub>4</sub> to CuCrFeO<sub>4</sub>. X-ray and IR studies indicated that the spinel catalysts are quite stable over the temperature range investigated.

Journal

  • Bulletin of the Chemical Society of Japan

    Bulletin of the Chemical Society of Japan 68(12), 3651-3657, 1995-12-15

    The Chemical Society of Japan

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Codes

  • NII Article ID (NAID)
    10008897126
  • NII NACSIS-CAT ID (NCID)
    AA00580132
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00092673
  • Data Source
    CJP  J-STAGE 
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