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High‐resolution imaging of nanoparticle bimetallic catalysts supported on mesoporous silica

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Abstract

Although conventional high‐resolution transmission electron microscopy is a powerful method for the elucidation of the structure of mesoporous solids (diameter of pores from 1.5 to 20 nm), it is far less capable than high‐resolution scanning transmission electron microscopy in identifying the spatial distribution of nanocrystals of catalysts encapsulated within the mesopores. Using high‐angle annular dark‐field imaging (either in a 100 or 300 keV STEM system), it is possible to locate precisely individual bimetallic nanoparticles (Ag3Ru10, Cu4Ru12 and Pd6Ru6 hydrogenation catalysts) supported on mesoporous silica, to determine their size distribution, and to record their characteristic X‐ray emission maps. It is also established that there is little tendency for elemental fragmentation of the bimetallic catalysts, all of which were prepared by decarbonylating, by thermolysis, precursor cluster carbonylate anions: [Ag3Ru10C2(CO)28Cl]−, [Ru6C(CO)16Cu2Cl]2− and [Ru6Pd6(CO)24]2−.

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Authors and Affiliations

  1. Department of Materials Science and Metallurgy, University of Cambridge, New Museums Site, Pembroke Street, Cambridge, CB2 3QZ, UK

    Dogan Ozkaya, John Meurig Thomas, Paul Midgley & Vicki J. Keast

  2. Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK

    Wuzong Zhou & Sophie Hermans

  3. Davy–Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albemarle Street, London, W1X 4BS, UK

    John Meurig Thomas

Authors
  1. Dogan Ozkaya
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  2. Wuzong Zhou
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  3. John Meurig Thomas
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  4. Paul Midgley
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  5. Vicki J. Keast
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  6. Sophie Hermans
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Ozkaya, D., Zhou, W., Thomas, J.M. et al. High‐resolution imaging of nanoparticle bimetallic catalysts supported on mesoporous silica. Catalysis Letters 60, 113–120 (1999). https://doi.org/10.1023/A:1019046705386

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  • DOI: https://doi.org/10.1023/A:1019046705386

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