Inst. Phys. Conf. Series, No. 168, 421 (2001)
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TEM investigations of industrial Pt/graphite catalyst systems: image processing and particle shapes
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Presented at: Electron Microscopy and Analysis 2001
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| Institute of Physics Conference Series, No. 168, 421 - 424 (2001) |
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S.C. Weller, R.E. Palmer, P.D. Nellist and J. Gillies
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Industrial platinum on graphite catalysts, prepared by salt deposition from aqueous solution, have been examined using transmission electron microscopy. The resulting micrographs show a mixture of dendritic metal islands, and smaller (1-4nm diameter) spherical islands. An image processing technique has been developed to subtract the graphite backgrounds, allowing the images to be made binary. The dendricity of a particle is then characterised by the formfactor, a measure derived from the TEM images, thus a quantitative comparison between the different, highly irregular, industrial catalyst samples is made feasible.
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