| AVS 56th International Symposium & Exhibition | |
| Surface Science | Tuesday Sessions |
| Session SS-TuP |
| Session: | Surface Science Poster Session I and Mort Traum Finalists |
| Presenter: | J. Croy, University of Central Florida |
| Authors: | J. Croy, University of Central Florida L.K. Ono, University of Central Florida S. Mostafa, University of Central Florida H. Heinrich, University of Central Florida B. Roldan Cuenya, University of Central Florida |
| Correspondent: | Click to Email |
The oxidation of Pt and the reactivity of Pt oxides are of fundamental importance in catalysis, and although much research has been conducted on the interaction of oxygen with Pt surfaces, most of the work is confined to UHV with bulk materials such as Pt(111). In this work we will explore the size-dependent oxidation and reduction properties of Pt nanoparticles (NPs) synthesized by reverse micelle encapsulation. We use in-situ O2-plasma treatments in conjunction with e-beam heating and X-ray photoelectron spectroscopy (XPS) to monitor the temperature-dependent reduction of Ptδ+ species in NPs with distinct size distributions. In addition temperature programmed desorption (TPD) was conducted to monitor the oxygen phases developed on our NP samples. These results are compared with the same experiments conducted on a Pt(111) crystal. In parallel to UHV studies, the activity of pre-oxidized Pt NPs, supported on nanocrystalline ZrO2, was tested for methanol (MeOH) decomposition and oxidation reactions at atmospheric pressure using a packed-bed reactor coupled to a quadrupole mass spectrometer (QMS). Transmission electron microscopy (TEM ) was conducted for morphological information and XPS was used to characterize samples both before and after interaction with MeOH.