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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lamberti, Carlo
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (29/29 displayed)
- 2018Experimental and theoretical study of hydrogen desorption process from Mn(BH4)2citations
- 2018Time-resolved operando studies of carbon supported Pd nanoparticles under hydrogenation reactions by X-ray diffraction and absorptioncitations
- 2017Effect of Molecular Guest Binding on the d-d Transitions of Ni(2+) of CPO-27-Ni: A Combined UV-Vis, Resonant-Valence-to-Core X-ray Emission Spectroscopy, and Theoretical Studycitations
- 2017Modulator Effect in UiO-66-NDC (1,4-Naphthalenedicarboxylic Acid) Synthesis and Comparison with UiO-67-NDC Isoreticular Metal–Organic Frameworkscitations
- 2017Effect of Benzoic Acid as a Modulator in the Structure of UiO-66: An Experimental and Computational Studycitations
- 2017Core-Shell Structure of Palladium Hydride Nanoparticles Revealed by Combined X-ray Absorption Spectroscopy and X-ray Diffractioncitations
- 2017CO2 Hydrogenation over Pt-Containing UiO-67 Zr-MOFs—The Base Casecitations
- 2017State-of-the-Art X-Ray Spectroscopy in Catalysiscitations
- 2015XAS and XES techniques shed light on the dark side of Ziegler-Natta catalysts: Active-site generationcitations
- 2015XAS and XES Techniques Shed Light on the Dark Side of Ziegler–Natta Catalysts: Active‐Site Generationcitations
- 2013EXAFS and XANES investigation of (Li, Ni) codoped ZnO thin films grown by pulsed laser depositioncitations
- 2011Combined study of structural properties of metal-organic frameworks changing organic linkers and metal centers
- 20110.5 wt.% Pd/C catalyst for purification of terephthalic acid: Irreversible deactivation in industrial plantscitations
- 2011Structure-activity relationships of simple molecules adsorbed on MOF materials: in situ experiments vs. theory
- 2010X-ray absorption spectroscopies: useful tools to understand Metallorganic frameworks structure and reactivitycitations
- 2009Influence of K-doping on a Pd/SiO2–Al2O3 catalystcitations
- 2009CO adsorption on CPO-27-Ni coordination polymer: spectroscopic features and interaction energycitations
- 2009CO adsorption on cpo-27-ni coordination polymercitations
- 2009Determination of the particle size, available surface area and nature of exposed sites for silica-alumina supported Pd nanoparticles: a multitechnical approachcitations
- 2008Oriented TiO2 nanostructured pillar arrays: Synthesis and characterizationcitations
- 2008Oriented TiO2 nanostructured pillar arrayscitations
- 2008Local structure of CPO-27-Ni metallorganic framework upon dehydration and coordination of NOcitations
- 2005New strategies in the Raman study of the Cr/SiO2 Phillips catalyst: Observation of molecular adducts on Cr(II) sitescitations
- 2005FTIR investigation of the H-2, N-2, and C2H4 molecular complexes formed on the Cr(II) sites in the Phillips catalyst: A preliminary step in the understanding of a complex systemcitations
- 2004Carbon monoxide MgO from dispersed solids to single crystals: a review and new advancescitations
- 2004X-ray absorption study at the Mg and O K-edges of ultrathin MgO epilayers on Ag(001)citations
- 2004Nio and Mgo ultrathin films by polarization dependent xascitations
- 2003X-ray Standing Waves studies of strained InxGa1-xAs/InP short period superlatticescitations
- 2003The use of EXAFS spectroscopy related techniques in the characterization of III-V thin films heterostructures
Places of action
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article
Core-Shell Structure of Palladium Hydride Nanoparticles Revealed by Combined X-ray Absorption Spectroscopy and X-ray Diffraction
Abstract
<p>We report an in situ, temperature and H<sub>2</sub> pressure-dependent, characterization of (2.6 ± 0.4) nm palladium nanoparticles supported on active carbon during the process of hydride phase formation. For the first time the core-shell structure is highlighted in the single-component particles on the basis of a different atomic structure and electronic configurations in the inner "core" and surface "shell" regions. The atomic structure of these particles is examined by combined X-ray powder diffraction (XRPD), which is sensitive to the crystalline core region of the nanoparticles, and by first shell analysis of extended X-ray absorption fine structure (EXAFS) spectra, which reflects the averaged structure of both the core and the more disordered shell. In the whole temperature range (0-85 °C), XRPD analysis confirms the existence of two well-separated α- and β-hydride phases with the characteristic flat plateau in the phase transition region of the pressure-lattice parameter isotherms. In contrast, first shell interatomic distances obtained from EXAFS exhibit a slope in the phase transition region, typical for nanostructured palladium. Such difference is explained by distinct properties of bulk "core" which has crystalline structure and sharp phase transition, and surface "shell" which is amorphous and absorbs hydrogen gradually without forming distinguishable α- and β-phases. Combining EXAFS and XRPD we extract, for the first time, the Pd-Pd first-shell distance in the amorphous shell of the nanoparticles, that is significantly shorter than in the bulk core and relevant in catalysis. The core/shell model is supported by the EXAFS analysis of the higher shells, in the frame of the multiple scattering theory, showing that the evolution of the third shell distance (ΔR<sub>3</sub>/R<sub>3</sub>) is comparable to the evolution of (Δa/a) obtained from XRPD since amorphous PdH<sub>x</sub> shell gives a negligible contribution in this range of distances. This operando structural information is relevant for the understanding of structure-sensitive reactions. Additionally, we demonstrate the differences in the evolution of the thermal parameters obtained from EXAFS and XRPD along the hydride phase formation.</p>