Highly Dense Isolated Metal Atom Catalytic Sites: Dynamic Formation and In Situ Observations

Yaxin Chen, Takeshi Kasama, Zhiwei Huang, Pingping Hu, Jianmin Chen, Xi Liu, Xingfu Tang

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Atomically dispersed noble-metal catalysts with highly dense active sites are promising materials with which to maximise metal efficiency and to enhance catalytic performance; however, their fabrication remains challenging because metal atoms are prone to sintering, especially at a high metal loading. A dynamic process of formation of isolated metal atom catalytic sites on the surface of the support, which was achieved starting from silver nanoparticles by using a thermal surface-mediated diffusion method, was observed directly by using in situ electron microscopy and in situ synchrotron X-ray diffraction. A combination of electron microscopy images with X-ray absorption spectra demonstrated that the silver atoms were anchored on five-fold oxygen-terminated cavities on the surface of the support to form highly dense isolated metal active sites, leading to excellent reactivity in catalytic oxidation at low temperature. This work provides a general strategy for designing atomically dispersed noble-metal catalysts with highly dense active sites.
    Original languageEnglish
    JournalChemistry-a European Journal
    Volume21
    Issue number48
    Pages (from-to)17397-17402
    Number of pages6
    ISSN0947-6539
    DOIs
    Publication statusPublished - 2015

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