Abstract
The catalytic performance of Pt-based catalysts for the total oxidation of hydrocarbons was investigated. The activity of supported Pt catalysts (Pt/Al 2 O 3 , Pt/ZrO 2 , Pt/TiO 2 , and Pt/H-ZSM-5) depends on the metal oxide support. Pt/Al 2 O 3 showed the highest catalytic activity when the catalysts were aged at 750°C for 50 h in air. The activity of Pt/Al 2 O 3 was dependent on the valence state of the Pt surface. Pt/Al 2 O 3 with the Pt surface in the metallic state was more active than with the surface in the cationic state. The surface density of acid and basic sites on the Al 2 O 3 support controlled the valence state of the Pt surface and stability of the Pt particles in the highly dispersed state, respectively. Pt/Al 2 O 3 that has the Pt surface in the metallic state was more active than with the surface in the cationic state. An Al 2 O 3 support with a high surface density of acid and basic sites is important.
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