Title
Pressure-Dependent Effect of Hydrogen Adsorption on Structural and Electronic Properties of Pt/gamma-Al2O3 Nanoparticles
Abbreviated Journal Title
ChemCatChem
Keywords
hydrogen; nanoparticles; platinum; structure elucidation; X-ray; absorption spectroscopy; RAY-ABSORPTION SPECTROSCOPY; METAL-SUPPORT INTERFACE; PARTICLE-SIZE; PLATINUM; CATALYSTS; CHEMISORPTION; CLUSTERS; EXAFS; COVERAGE; STORAGE; Chemistry, Physical
Abstract
Understanding the interaction of hydrogen with subnanometer platinum nanoparticles (NPs) under industrially relevant conditions is of great importance to heterogeneous catalysis. In this work, we investigate the pressure-dependent changes in hydrogen coverage on size- and shape-selected Pt/-Al2O3 NPs by insitu X-ray absorption near-edge structure (XANES) analysis. Difference XANES calculations revealed an increase in the H/Pt ratio from 1.9 to 2.5 upon increasing the hydrogen pressure from 1 to 21bar at room temperature (1bar=100kPa). In addition, extended X-ray absorption fine structure measurements of the local geometrical structure showed changes in PtPt bond length and coordination number, revealing a morphological transformation in the NPs from a 2D to a 3D shape under increasing H-2 pressure at room temperature. Such shape evolution leads to a decrease in the NP-support contact area and is thus expected to affect the NP stability against coarsening.
Journal Title
Chemcatchem
Volume
6
Issue/Number
1
Publication Date
1-1-2014
Document Type
Article
Language
English
First Page
348
Last Page
352
WOS Identifier
ISSN
1867-3880
Recommended Citation
"Pressure-Dependent Effect of Hydrogen Adsorption on Structural and Electronic Properties of Pt/gamma-Al2O3 Nanoparticles" (2014). Faculty Bibliography 2010s. 5842.
https://stars.library.ucf.edu/facultybib2010/5842
Comments
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