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Self-activated surface dynamics in gold catalysts under reaction environments

Author

Listed:
  • Naoto Kamiuchi

    (Osaka University)

  • Keju Sun

    (Osaka University
    National Institute of Advanced Industrial Science and Technology (AIST)
    Yanshan University)

  • Ryotaro Aso

    (Osaka University)

  • Masakazu Tane

    (Osaka University)

  • Takehiro Tamaoka

    (Osaka University)

  • Hideto Yoshida

    (Osaka University)

  • Seiji Takeda

    (Osaka University)

Abstract

Nanoporous gold (NPG) with sponge-like structures has been studied by atomic-scale and microsecond-resolution environmental transmission electron microscopy (ETEM) combined with ab initio energy calculations. Peculiar surface dynamics were found in the reaction environment for the oxidation of CO at room temperature, involving residual silver in the NPG leaves as well as gold and oxygen atoms, especially on {110} facets. The NPG is thus classified as a novel self-activating catalyst. The essential structure unit for catalytic activity was identified as Au–AgO surface clusters, implying that the NPG is regarded as a nano-structured silver oxide catalyst supported on the matrix of NPG, or an inverse catalyst of a supported gold nanoparticulate (AuNP) catalyst. Hence, the catalytically active structure in the gold catalysts (supported AuNP and NPG catalysts) can now be experimentally unified in low-temperature CO oxidation, a step forward towards elucidating the fascinating catalysis mechanism of gold.

Suggested Citation

  • Naoto Kamiuchi & Keju Sun & Ryotaro Aso & Masakazu Tane & Takehiro Tamaoka & Hideto Yoshida & Seiji Takeda, 2018. "Self-activated surface dynamics in gold catalysts under reaction environments," Nature Communications, Nature, vol. 9(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04412-4
    DOI: 10.1038/s41467-018-04412-4
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