高等学校化学学报

高等学校化学学报

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电导研究贵金属Pt在Co3O4还原过程中的作用

徐东彦, 段洪敏, 李文钊, 葛庆杰, 于春英, 徐恒泳
   

  1. 中国科学院大连化学物理研究所, 大连 116023
  • 收稿日期:2005-10-25 修回日期:1900-01-01 出版日期:2006-09-10 发布日期:2006-09-10
  • 通讯作者: 徐恒泳

Effect of Pt on Co3O4 Reduction via Electrical Conductance Method

XU Dong-Yan, DUAN Hong-Min, LI Wen-Zhao, GE Qing-Jie, YU Chun-Ying, XU Heng-Yong
   

  1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 11602
    3, China
  • Received:2005-10-25 Revised:1900-01-01 Online:2006-09-10 Published:2006-09-10
  • Contact: XU Heng-Yong

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摘要： 通过考察Co3O4在还原过程中电导率的变化, 并结合程序升温还原方法, 对贵金属Pt的作用进行了研究. 另外, 研究了Co3O4在氢气、氧气和合成气气氛中电导率的连续变化过程, 以便进一步了解Co3O4在实际费-托合成反应条件下的氧化-还原历程, 以及贵金属Pt在该过程中的作用.

关键词: 贵金属, 铂, Co3O4, 还原, 电导

Abstract: The reduction features of Co3O4 and Pt/Co3O4 were studied by electrical conductivity in this paper. Combined with the TPR results, it is concluded that the presence of noble metal Pt could significantly decrease the reduction temperature of Co3O4. In addition, the electrical conductance ratios of Co3O4 and Pt/Co3O4 under different atmospheres, which are in a consecutively changing sequence of hydrogen, oxygen and syngas, were also investigated. It is found that the cobalt oxides resulted from the oxidation of Co metal under oxygen atmosphere can be re-reduced by the syngas in the presence of Pt noble metal. Because the electrical conductance study was conducted at 493 K, which is close to the typical reaction temperature of FischerTropsch synthesis with cobalt based catalysts. It is reasonably speculated that the presence of Pt is beneficial to inhibiting the oxidation of cobalt metal during the Fischer-Tropsch synthesis, and thus eliminating the deactivation of cobalt catalyst.

Key words: Noble metal, Platinum, Co3O4, Reduction, Electrical conductance

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