Platinum-Based Catalyst for Diesel Hydrocarbon Oxidation

The catalytic performance of Pt-based catalysts for the total oxidation of hydrocarbons was investigated. The activity of supported Pt catalysts (Pt/Al2O3, Pt/ZrO2, Pt/TiO2, and Pt/H-ZSM-5) depends on the metal oxide support. Pt/Al2O3 showed the highest catalytic activity when the catalysts were aged at 750°C for 50 h in air. The activity of Pt/Al2O3 was dependent on the valence state of the Pt surface. Pt/Al2O3 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 Al2O3 support controlled the valence state of the Pt surface and stability of the Pt particles in the highly dispersed state, respectively.

Pt/Al2O3 that has the Pt surface in the metallic state was more active than with the surface in the cationic state. An Al2O3 support with a high surface density of acid and basic sites is important.Figure optionsDownload as PowerPoint slide