| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 55093 | Catalysis Today | 2013 | 7 Pages |
The effect of Y-stabilized ZrO2 as support on the Pt dispersion and catalytic activity for the total oxidation of n-butane was investigated. From XRD, TEM and CO chemisorption measurements, Pt particles were found to be well dispersed with a size of ca. 10 nm over the surface of ZrO2 and Y-stabilized ZrO2, when Pt supported catalysts were calcined at 600 °C. Although Pt particles supported on ZrO2 were significantly sintered by high temperature calcination above 800 °C, no aggregation of Pt particles was observed for Pt/Y–ZrO2. When the catalyst was calcined at higher temperatures, Pt catalysts supported on Y-stabilized ZrO2 showed higher activity than Pt/ZrO2 for the total oxidation of n-butane. The intrinsic activity, expressed in terms of turnover frequency (TOF), increased with the decrease in Pt dispersion, indicating that n-butane oxidation over Pt catalysts supported on Y-stabilized ZrO2 is a structure sensitive reaction. Y2O3 additive plays a role in improving the thermal stability of Pt particles through the metal–support interaction, while it does not alter the catalytic performance of Pt as catalytic active sites.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (118 K)Download as PowerPoint slideHighlights► Pt particles supported on Y–ZrO2 are stabilized in highly dispersed state. ► Pt/Y–ZrO2 showed higher activity than Pt/ZrO2 for n-C4H10 oxidation. ► n-C4H10 oxidation over Pt/Y–ZrO2 is a structure sensitive reaction. ► Y2O3 additive improves thermal stability of Pt through the metal–support interaction.
