期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 21, 期 48, 页码 17397-17402出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201503068
关键词
electron microscopy; heterogeneous catalysis; surface analysis; surface chemistry; X-ray diffraction
资金
- NSFC [21277032, 21477023]
- STCSM [14JC1400400]
- Syngaschem BV (The Netherlands)
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.
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