Abstract
Abstract A series of the modified Pt/SiO 2 –Al 2 O 3 diesel oxidation catalysts with different WO 3 loading were prepared through co-impregnation method. With an optimum additive loading of 2 wt% WO 3 , the catalyst significantly improved the performance and its stability. Compared to the free-tungsten sample, the catalyst increased the maximum conversion of NO by 5–10% and decreased the reaction temperature for 30% NO conversion by 7–28 °C. It was found that there exist the electron and structure interaction between platinum and tungsten species. The interactions can generate and maintain more Pt sites in metallic state for the catalytic oxidation with enhanced activity and stability.
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