| People | Locations | Statistics |
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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
Time-resolved operando studies of carbon supported Pd nanoparticles under hydrogenation reactions by X-ray diffraction and absorption
Abstract
<p>The formation of palladium hydride and carbide phases in palladium-based catalysts is a critical process that changes the catalytic performance and selectivity of the catalysts in important industrial reactions, such as the selective hydrogenation of alkynes or alkadienes. We present a comprehensive study of a 5 wt% carbon supported Pd nanoparticle (NP) catalyst in various environments by using in situ and operando X-ray absorption spectroscopy and diffraction, to determine the structure and evolution of palladium hydride and carbide phases, and their distribution throughout the NPs. We demonstrate how the simultaneous analysis of extended X-ray absorption fine structure (EXAFS) spectra and X-ray powder diffraction (XRPD) patterns allows discrimination between the inner "core" and outer "shell" regions of the NP during hydride phase formation at different temperatures and under different hydrogen pressures, indicating that the amount of hydrogen in the shell region of the NP is lower than that in the core. For palladium carbide, advanced analysis of X-ray absorption near-edge structure (XANES) spectra allows the detection of Pd-C bonds with carbon-containing molecules adsorbed at the surface of the NPs. In addition, H/Pd and C/Pd stoichiometries of PdH<sub>x</sub> and PdC<sub>y</sub> phases were obtained by using theoretical modelling and fitting of XANES spectra. Finally, the collection of operando time-resolved XRPD patterns (with a time resolution of 5 s) allowed the detection, during the ethylene hydrogenation reaction, of periodic oscillations in the NPs core lattice parameter, which were in phase with the MS signal of ethane (product) and in antiphase with the MS signal of H<sub>2</sub> (reactant), highlighting an interesting direct structure-reactivity relationship. The presented studies show how a careful combination of X-ray absorption and diffraction can differentiate the structure of the core, shell and surface of the palladium NPs under working conditions and prove their relevant roles in catalysis.</p>