| 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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Bordiga, Silvia
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (22/22 displayed)
- 2024A critical assessment on calculating vibrational spectra in nanostructured materialscitations
- 2023A critical assessment on calculating vibrational spectra in nanostructured materialscitations
- 2022Tailoring novel polymer/UTSA-16 hybrid aerogels for efficient CH4/CO2 separationcitations
- 2021Functional Dyes in Polymeric 3D Printing: Applications and Perspectivescitations
- 2020Synthesis of ZSM-23 (MTT) zeolites with differentcrystal morphology and intergrowths: effects onthe catalytic performance in the conversion ofmethanol to hydrocarbonscitations
- 2019Characterization and Modeling of Reversible CO2 Capture from Wet Streams by a MgO/Zeolite Y Nanocompositecitations
- 2018On the structure of superbasic (MgO)n sites solvated in a faujasite zeolitecitations
- 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
- 2017CO2 Hydrogenation over Pt-Containing UiO-67 Zr-MOFs—The Base Casecitations
- 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
- 2014Synthesis and Characterization of Amine-Functionalized Mixed-Ligand Metal-Organic Frameworks of UiO-66 Topologycitations
- 2011Combined study of structural properties of metal-organic frameworks changing organic linkers and metal centers
- 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
- 2009CO adsorption on CPO-27-Ni coordination polymer: spectroscopic features and interaction energycitations
- 2009CO adsorption on cpo-27-ni coordination polymercitations
- 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
Places of action
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article
XAS and XES Techniques Shed Light on the Dark Side of Ziegler–Natta Catalysts: Active‐Site Generation
Abstract
<jats:title>Abstract</jats:title><jats:p>The local structure and the electronic properties of the active Ti sites in heterogeneous Ziegler–Natta catalysts, generated in situ by interaction of the precatalyst with different Al‐alkyl activators, were investigated by combining X‐ray absorption and valence‐to‐core X‐ray emission spectroscopy (XAS and vtc‐XES), coupled with UV/Vis, FTIR, and DFT theoretical calculations. Irrespective of the activator used, the active system was found to be a highly dispersed TiCl<jats:sub>3</jats:sub>‐like phase in which the Ti sites are surrounded, not only by bridged chlorine ligands (with the same bond length of bulk TiCl<jats:sub>3</jats:sub>), but also by terminal chlorine ligands, at a much shorter distance. These results set Ziegler–Natta catalysts in the category of complex nanomaterials. Despite the observation that the investigated catalysts polymerize ethylene, cutting‐edge XAS and XES techniques do not yet offer unequivocal proof for the presence of any alkyl chain attached to the Ti sites, as a consequence of the small fraction of the active sites.</jats:p>