TEM Observation of the Interaction in Supported Precious Metal Catalysts

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  • Kamiuchi Naoto
    京都大学大学院工学研究科物質エネルギー化学専攻
  • Matsui Toshiaki
    京都大学大学院工学研究科物質エネルギー化学専攻
  • Eguchi Koichi
    京都大学大学院工学研究科物質エネルギー化学専攻

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  • 担持貴金属触媒における貴金属―担体間相互作用の透過型電子顕微鏡による観察
  • タンジ キキンゾク ショクバイ ニ オケル キキンゾク タンタイ カン ソウゴ サヨウ ノ トウカガタ デンシ ケンビキョウ ニ ヨル カンサツ

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Abstract

<p>The catalyst of Pt/SnO2 was prepared by the impregnation method. The catalytic activities of Pt/SnO2 catalysts pretreated under several conditions were investigated for the combustion of ethyl acetate. The activity was degraded by the heat-treatment in a reducing atmosphere, and was recovered to some extent by the reoxidation treatment. The interface between platinum particles and SnO2 particles were observed by TEM so as to elucidate the cause of the change in catalytic activity. In the Pt/SnO2 catalyst reduced in hydrogen, the particles with core-shell structure were clearly observed. On the other hand, the redispersion of platinum particles was confirmed in the reoxidized Pt/SnO2 catalyst. Thus, it was verified that the catalytic activities of Pt/SnO2 were strongly related with their nano structure. The analogous structural change proceeded in the other precious metal catalysts such as Ru/SnO2, Pd/SnO2, and Rh/SnO2.</p>

Journal

  • KENBIKYO

    KENBIKYO 46 (1), 3-6, 2011-03-30

    The Japanese Society of Microscopy

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