メタン雰囲気下におけるχ-Al_2O_3に担持したPdOの結晶構造に及ぼすCeO_2添加の影響  [in Japanese] Effect of CeO_2 Addition on the Change of Crystal Structure of PdO Supported on χ-Al_2O_3 under the Methane Atmosphere  [in Japanese]

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Abstract

The effect of CeO<sub>2</sub> additions into a PdO catalyst supported on χ-Al<sub>2</sub>O<sub>3</sub> has been investigated. Changes in crystal structure have been examined in a methane atmosphere, in relation to catalytic activity for methane oxidation. The mass ratio Al<sub>2</sub>O<sub>3</sub>/PdO of the catalysts was kept constant at a value of 9, whereas the atomic ratio <i>R</i>=Pd/Ce was set to 0, 1, 2 and 5. The PdO-CeO<sub>2</sub>/χ-Al<sub>2</sub>O<sub>3</sub> catalyst with <i>R</i>=1 showed the best catalytic activity in methane oxidation. When the catalyst was heated at 300°C, Pd metal appeared under the O<sub>2</sub>-deficient atmosphere, whereas PdO was reformed when the reduced catalyst was heated at 300°C in an atmosphere with an O<sub>2</sub>-excess. Line broadening of X-ray diffraction patterns was detected for both the (110) plane of PdO and the (200) plane of the Pd formed after heating, suggesting that stacking faults were introduced into these planes by the loss of oxygens in the PdO/Pd lattice during the reaction with methane. As the (110) planes in PdO correspond to the (200) planes of the fcc Pd metal formed during reaction, in terms of the array of the constituent metal only, methane oxidation would easily proceed by way of these oxygen-deficient lattice planes.<br>

Journal

  • Journal of the Ceramic Society of Japan

    Journal of the Ceramic Society of Japan 112(1303), 149-152, 2004-03-01

    The Ceramic Society of Japan

References:  8

Cited by:  1

Codes

  • NII Article ID (NAID)
    110002288181
  • NII NACSIS-CAT ID (NCID)
    AN10040326
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09145400
  • NDL Article ID
    6874814
  • NDL Source Classification
    ZP9(科学技術--化学・化学工業--無機化学・無機化学工業--セラミックス・窯業)
  • NDL Call No.
    Z17-249
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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