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Zeolites are of interest as supports for reforming catalysts because of their high selectivity and because they provide a means of achieving and maintaining high dispersion of noble metals. This translates into high activity and also the maintenance of activity for an extended period of time. One of the goals of catalyst characterization in general is to measure those properties assumed to be responsible for performance in a given reaction. In this study, we have applied powder x-ray diffraction (XRD) and high-resolution electron microscopy (HREM) techniques to determine the size, shape, distribution, and location of Pt metal crystallites on a synthetic zeolite support in an attempt to explain CO chemisorption results.