| 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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Vitillo, Jenny Grazia
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (21/21 displayed)
- 2018Understanding and Controlling the Dielectric Response of Metal–Organic Frameworkscitations
- 2018Time-resolved operando studies of carbon supported Pd nanoparticles under hydrogenation reactions by X-ray diffraction and absorptioncitations
- 2018On the structure of superbasic (MgO)n sites solvated in a faujasite zeolitecitations
- 2018Structure and Host–Guest Interactions of Perylene–Diimide Dyes in Zeolite L Nanochannelscitations
- 2017Core-Shell Structure of Palladium Hydride Nanoparticles Revealed by Combined X-ray Absorption Spectroscopy and X-ray Diffractioncitations
- 2014Evolution and reversibility of host/guest interactions with temperature changes in a methyl red@palygorskite polyfunctional hybrid nanocompositecitations
- 2012Evolution of host/guest interactions with heating in a palygorskite/methyl red (Maya Red) hybrid composite
- 2012Monolithic nanoporous-crystalline aerogels based on PPOcitations
- 2011Crystal structure refinement of a sepiolite/indigo Maya Blue pigment using molecular modelling and synchrotron diffractioncitations
- 2011Nanoporous crystalline phases of poly(2,6-dimethyl-1,4-phenylene)oxidecitations
- 2011Combined study of structural properties of metal-organic frameworks changing organic linkers and metal centers
- 2011Aerogels and polymorphism of isotactic poly(4-methyl-pentene-1)citations
- 2011Structure and thermodynamic properties of the NaMgH3 perovskitecitations
- 2011Structure-activity relationships of simple molecules adsorbed on MOF materials: in situ experiments vs. theory
- 2010Hydrogen adsorption by δ and ε crystalline phases of syndiotactic polystyrene aerogelscitations
- 2010Storage of hydrogen as a guest of a nanoporous polymeric crystalline phasecitations
- 2010Hydrogen adsorption by delta and epsilon crystalline phases of syndiotactic polystirene aerogelscitations
- 2009CO adsorption on CPO-27-Ni coordination polymer: spectroscopic features and interaction energycitations
- 2009CO adsorption on cpo-27-ni coordination polymercitations
- 2008Oriented TiO2 nanostructured pillar arrayscitations
- 2008Local structure of CPO-27-Ni metallorganic framework upon dehydration and coordination of NOcitations
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>