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Modification of Pd-CeCO_2 catalyst by different treatments: Effect on the structure and CO oxidation activity

机译：不同处理方式对Pd-CeCO_2催化剂的改性：对结构和CO氧化活性的影响

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摘要

To investigate the interaction between noble metal and CeO_2, a Pd-doped CeO_2 catalyst was prepared by sol-gel method, and the catalyst was then treated in static air and a H2/O_2 alternating flow at 800℃, respectively. It is found by step-scanning XRD that Pd ions migrate out of the ceria lattice during the redox treatment, while the exudation of Pd is not so obvious after the oxidative treatment. For the CO oxidation activity, the redox treated catalyst is seriously weakened compared with the oxidative-treated one. This difference is ascribed to the encapsulation of Pd crystallites by the CeO_2 support during the redox treatment, which is confirmed by XPS and CO-TPR. Based on the activity and FTIR results, it is proposed that, CO oxidation at low temperatures proceeds mainly via the reaction between the adsorbed CO on Pd sites and the lattice oxygen of surface CeO_2 at the Pd-Ce interface.
机译：为了研究贵金属与CeO_2之间的相互作用，采用溶胶-凝胶法制备了Pd掺杂的CeO_2催化剂，然后分别在静态空气和H2 / O_2交替流动下于800℃对其进行处理。通过X射线衍射的逐步扫描发现，氧化还原处理过程中Pd离子迁移出二氧化铈晶格，而氧化处理后Pd的渗出并不明显。对于CO的氧化活性，与氧化处理的催化剂相比，氧化还原处理的催化剂被严重削弱。这种差异归因于氧化还原处理期间CeO_2载体对Pd晶粒的包封，这由XPS和CO-TPR证实。根据活性和FTIR结果，提出低温下的CO氧化主要通过Pd位点上吸附的CO与Pd-Ce界面上的CeO_2表面的晶格氧之间的反应进行。

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  • 来源
    《Applied Surface Science》 |2011年第9期|p.3878-3883|共6页
  • 作者

    Bin Wang; Duan Weng; Xiaodong Wu; Rui Ran;

  • 作者单位

    State Key Laboratory of New Ceramics & Fine Process, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of New Ceramics & Fine Process, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of New Ceramics & Fine Process, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of New Ceramics & Fine Process, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Palladium,Ceria,Oxidative/redox treatment,Encapsulation,Metal-support interaction;

    机译：钯;二氧化铈;氧化/氧化还原处理;封装;金属-载体相互作用;

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