Abstract
Particle sizes of platinum dispersed on a graphitized carbon black (Vulcan 3G) and samples resulting from its prior oxidation in air at 798 K have been measured by Small Angle X-ray Scattering (SAXS) and Transmission Electron Microscopy (TEM). Mean diameters of platinum particles decrease with increasing burn-off of the carbonaceous supports. The values of mean diameters as determined by these physical methods agree well with those estimated from gas titration procedures. Size distributions of the platinum particles are also described in terms of log-normal functions.
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