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DISPERSION OF SUPPORTED PLATINUM CATALYSTS IN OXYGEN I. EXPERIMENTAL EVIDENCES OF REDISPERSION

Lee TJ Kim YG

Korean Journal of Chemical Engineering, March 1985, 2(1), 55-61(7), 10.1007/BF02697550

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Abstract

The redispersion of platinum on -Al₂O₃, SiO₂ 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℃ occurs only for Pt/ -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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