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The Pd-Pt/Al 2 O 3 bimetallic catalysts showed high activities toward the wet oxidation of the reactive dyes in the presence of 1% H 2 together with excess oxygen. Palladium was believed to act as a co-catalyst to spillover the adsorbed H 2 onto the surface of the oxidized Pt surface, and thereby the reducibility of the Pt increased greatly. The organic dye molecule...