Ni/LaAlO_3触媒上でのメタン部分酸化における低温活性発現 Low Temperature lgnition of Methane Partial Oxidation over Ni/LaAlO_3 Catalyst

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Author(s)

    • 向井 大揮 MUKAI Daiki
    • 早稲田大学先進理工学部応用化学科 Dept. of Applied Chemistry, School of Advanced Science and Engineering, Waseda University
    • 江田 登志成 EDA Toshinari
    • 早稲田大学先進理工学部応用化学科 Dept. of Applied Chemistry, School of Advanced Science and Engineering, Waseda University
    • 菊地 英一 KIKUCHI Eiichi
    • 早稲田大学先進理工学部応用化学科 Dept. of Applied Chemistry, School of Advanced Science and Engineering, Waseda University
    • 関根 泰 SEKINE Yasushi
    • 早稲田大学先進理工学部応用化学科 Dept. of Applied Chemistry, School of Advanced Science and Engineering, Waseda University

Abstract

メタンの接触部分酸化を低温で駆動するためのニッケル触媒を検討し,担体としてペロブスカイト型酸化物を用いた。LaAlO<sub>3</sub>ペロブスカイト型酸化物にNiを担持した触媒は,水素還元後にメタンの部分酸化を673 Kというこれまでに例を見ない低い温度で活性を示した。LaAlO<sub>3</sub>ペロブスカイト上に担持したニッケルは他の担体と比べ相互作用が弱く,より還元を受けやすいことが分かった。反応はメタンの燃焼とそれに伴う水蒸気改質などにより進行し,還元されたニッケルはこれら両方の活性点であった。パラジウムをさらに逐次含浸した触媒は,無還元でも反応が進行した。この際のニッケルとLaAlO<sub>3</sub>ペロブスカイトの相互作用,パラジウムの役割について各種キャラクタリゼーションにより詳細な検討を行った結果,パラジウムがメタン酸化を促進し,還元されやすいLaAlO<sub>3</sub>上のニッケルが活性点となり接触部分酸化が進行していることが分かった。

Low temperature partial oxidation of methane to produce syngas was investigated over Ni catalysts supported on various perovskite oxides. Pre-reduced Ni catalyst supported on LaAlO<sub>3</sub> perovskite showed high catalytic activity at 673 K, the lowest temperature reported to date. Ni particles on LaAlO<sub>3</sub> perovskite showed weaker interaction between metal and support, and were reduced at lower temperature than on other Ni catalysts. Partial oxidation proceeded <i>via</i> methane combustion and steam reforming, and the reduced Ni particles were active sites for both of these reactions. Additional impregnation of Pd enabled catalysis of the reaction without pre-reduction. The functions of Ni particles, LaAlO<sub>3</sub> perovskite, and supported Pd were investigated by various methods, and found that Pd promoted the oxidation of methane, and catalytic partial oxidation proceeded over reduced Ni.

Journal

  • Journal of the Japan Petroleum Institute

    Journal of the Japan Petroleum Institute 56(3), 156-164, 2013-05-01

    The Japan Petroleum Institute

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Codes

  • NII Article ID (NAID)
    10031193396
  • NII NACSIS-CAT ID (NCID)
    AA11590615
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    13468804
  • NDL Article ID
    024694619
  • NDL Call No.
    Z17-177
  • Data Source
    CJP  NDL  J-STAGE 
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