Abstract

Pt γ-Al 2O 3 catalysts with and without chloride were treated at different temperatures in oxygen or hydrogen and were studied by temperature-programmed reduction and by hydrogen adsorption. Two surface oxides, α- and β-[PtO 2] s, and two chloride-containing surface complexes, [Pt IV(OH) x Cl y ] s and [Pt IVO x Cl y ] s, could be found and a comprehensive scheme of surface reactions is proposed. Redispersion of Pt in oxygen is possible only in the presence of chloride and is connected with the formation of [Pt IVO x Cl y ] s. A model for the redispersion is proposed.

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