Catalysis Letters

, Volume 24, Issue 1–2, pp 47–57 | Cite as

Particle size studies of supported metal catalysts: a comparative study by X-ray diffraction, EXAFS and electron microscopy

  • A. T. Ashcroft
  • A. K. Cheetham
  • P. J. F. Harris
  • R. H. Jones
  • S. Natarajan
  • G. Sankar
  • N. J. Stedman
  • J. M. Thomas
Article

Abstract

Supported ruthenium and iridium metal catalysts are studied by X-ray diffraction (XRD), EXAFS analysis and transmission electron microscopy (TEM). Estimates of the mean particle size from these techniques range from 20 to 25 Å from XRD, 13 to 16 Å from EXAFS and 25 to 32 Å from TEM. The strengths and weaknesses of these instrumental methods are discussed, as is the intrinsic comparability of these techniques. From a combination of these methods, the average particle size is estimated to be of the order of 20–30 Å.

Keywords

Particle size X-ray diffraction electron microscopy EXAFS catalysts 

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Copyright information

© J.C. Baltzer AG, Science Publishers 1994

Authors and Affiliations

  • A. T. Ashcroft
    • 1
  • A. K. Cheetham
    • 1
  • P. J. F. Harris
    • 2
  • R. H. Jones
    • 3
    • 4
  • S. Natarajan
    • 3
  • G. Sankar
    • 3
  • N. J. Stedman
    • 2
  • J. M. Thomas
    • 3
  1. 1.Materials DepartmentUniversity of CaliforniaSanta BarbaraUSA
  2. 2.Chemical Crystallography LaboratoryOxfordUK
  3. 3.Davy Faraday LaboratoryRoyal InstitutionLondonUK
  4. 4.Department of ChemistryUniversity of KeeleKeeleUK

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