Abstract
The redispersion of platinum on γ-Al2O3, SiO22 and TiO2 is experimentally studied by means of hydrogen chemisorption, XRD, TEM, and cyclohexene hydrogenation. The increase in dispersion following treatment in oxygen below 600‡C occurs only for Pt/γ-Al2O3. For Pt/TiO2, only the presence of chloride during oxidation brings about a significant redispersion. For Pt/SiO2, redispersion does not occur under any condition. Redispersion can occur only in the presence of platinum oxide which can be stabilized by forming a complex with the support. The methods for determining whether or not redispersion will occur for any system and the conditions needed for redispersion are discussed.
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