Catalysis Letters

, Volume 60, Issue 3, pp 113–120

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

  • Dogan Ozkaya
  • Wuzong Zhou
  • John Meurig Thomas
  • Paul Midgley
  • Vicki J. Keast
  • Sophie Hermans
Article

DOI: 10.1023/A:1019046705386

Cite this article as:
Ozkaya, D., Zhou, W., Thomas, J.M. et al. Catalysis Letters (1999) 60: 113. doi:10.1023/A:1019046705386

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−.

bimetallic nanoparticles Cu–Ru Ag–Ru Pd–Ru Rutherford scattering Z-contrast microscopy elemental imaging hydrogenation catalysts X‐ray emission 

Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Dogan Ozkaya
    • 1
  • Wuzong Zhou
    • 2
  • John Meurig Thomas
    • 1
    • 3
  • Paul Midgley
    • 1
  • Vicki J. Keast
    • 1
  • Sophie Hermans
    • 2
  1. 1.Department of Materials Science and MetallurgyUniversity of CambridgeCambridgeUK
  2. 2.Department of ChemistryUniversity of CambridgeCambridgeUK
  3. 3.Davy–Faraday Research LaboratoryThe Royal Institution of Great BritainLondonUK

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