| AVS 63rd International Symposium & Exhibition | |
| In-Situ and Operando Spectroscopy and Microscopy for Catalysts, Surfaces, & Materials Focus Topic | Friday Sessions |
| Session IS-FrM |
| Session: | In situ Characterization of Nanomaterials |
| Presenter: | Zheng Lu, University of Alabama in Huntsville |
| Authors: | Z. Lu, University of Alabama in Huntsville Y. Lei, University of Alabama in Huntsville |
| Correspondent: | Click to Email |
Metal nanoparticles can exhibit dramatically different catalytic properties compared to their bulk counterparts. The structure of the supported metal nanoparticles can change dynamically under reaction condition such as when molecules adsorb on the surface. A fundamental understanding of the structure of supported nano catalysts under reaction conditions is an important step towards achieving precise structure-reactivity relationship in catalysis and will ultimately lead to better catalysts.
In this work, we combined X-ray absorption spectroscopy (XAS), pair distribution function (PDF) and small angle X-ray scattering (SAXS) measurements to reveal the lattice contraction and expansion of supported small platinum, palladium and Au nanoparticles as a function of the particle size and the adsorbates. X-ray absorption spectroscopy measurements were performed at the sector 10 beamline at the Advanced Photon Source (APS) at Argonne National Laboratory (ANL). Scattering data of PDF were collected at beamline 11-ID-B at the APS. High energy X-rays (58 keV) were used in combination with a large area detector. SAXS experiments were performed at the APS 12-ID-B station. The 2D SAXS data were collected on an area detector, a q range of 0.006−0.7 Å-1 with an incident energy of 12 keV.
The support precious metal nano catalysts were studied under selective oxidation reaction conditions.These findings will help us to understand adsorbate-induced structural and chemical changes in precious metal nano catalysts and be useful for improving catalytic activity.