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  Pressure-Dependent Effect of Hydrogen Adsorption on Structural and Electronic Properties of Pt/γ-Al2O3 Nanoparticles

Mistry, H., Behafarid, F., Bare, S. R., & Roldan Cuenya, B. (2014). Pressure-Dependent Effect of Hydrogen Adsorption on Structural and Electronic Properties of Pt/γ-Al2O3 Nanoparticles. ChemCatChem, 6(1), 348-352. doi:10.1002/cctc.201300783.

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 Creators:
Mistry, Hemma1, Author
Behafarid, Farzad1, Author
Bare, Simon R.2, Author
Roldan Cuenya, Beatriz1, 3, Author           
Affiliations:
1Department of Physics, University of Central Florida, Orlando, FL 32816 (USA), ou_persistent22              
2UOP LLC, a Honeywell Company, Des Plaines, IL 60017 (USA), ou_persistent22              
3Department of Physics, Ruhr-University Bochum, ou_persistent22              

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 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/γ‐Al2O3 NPs by in situ 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 21 bar at room temperature (1 bar=100 kPa). In addition, extended X‐ray absorption fine structure measurements of the local geometrical structure showed changes in Pt-Pt bond length and coordination number, revealing a morphological transformation in the NPs from a 2 D to a 3 D shape under increasing H2 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.

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Language(s): eng - English
 Dates: 2014-01
 Publication Status: Published online
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/cctc.201300783
 Degree: -

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Title: ChemCatChem
  Other : ChemCatChem
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: 5 Volume / Issue: 6 (1) Sequence Number: - Start / End Page: 348 - 352 Identifier: ISSN: 1867-3880
CoNE: https://pure.mpg.de/cone/journals/resource/1867-3880