| 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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Weckhuysen, Bm Bert
Utrecht University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (46/46 displayed)
- 2024Catalytic Pyrolysis of Polyethylene with Microporous and Mesoporous Materials
- 2024Alternative nano-lithographic tools for shell-isolated nanoparticle enhanced Raman spectroscopy substratescitations
- 2024The Coking of a Solid Catalyst Rationalized with Combined Raman and Fluorescence Lifetime Microscopycitations
- 2023The Growth of Metal–Organic Framework Films on Calcium Fluoride and Their Interaction With Reactive Moleculescitations
- 2023Role of Titanium in Ti/SiO2-Supported Metallocene-based Olefin Polymerization Catalysts. Part 2citations
- 2023Ultraviolet-Visible (UV-Vis) Spectroscopycitations
- 2023Restructuring of titanium oxide overlayers over nickel nanoparticles during catalysiscitations
- 2023Halide-guided active site exposure in bismuth electrocatalysts for selective CO2 conversion into formic acidcitations
- 2022Structure-Activity Relationships in Highly Active Platinum-Tin MFI-type Zeolite Catalysts for Propane Dehydrogenationcitations
- 2021Influence of Metal-Alkyls on Early-Stage Ethylene Polymerization over a Cr/SiO2 Phillips Catalystcitations
- 2020Basicity and Electrolyte Composition Dependent Stability of Ni-Fe-S and Ni-Mo Electrodes during Water Splittingcitations
- 2020Correction: Micro-spectroscopy of HKUST-1 metal–organic framework crystals loaded with tetracyanoquinodimethane: effects of water on host–guest chemistry and electrical conductivity
- 2020Structure Sensitivity in Steam and Dry Methane Reforming over Nickelcitations
- 2020Nanoweb Surface-Mounted Metal-Organic Framework Films with Tunable Amounts of Acid Sites as Tailored Catalystscitations
- 2020Combined in Situ X-ray Powder Diffractometry/Raman Spectroscopy of Iron Carbide and Carbon Species Evolution in Fe(-Na-S)/α-Al2O3Catalysts during Fischer-Tropsch Synthesiscitations
- 2019Micro-spectroscopy of HKUST-1 metal-organic framework crystals loaded with tetracyanoquinodimethane: effects of water on host-guest chemistry and electrical conductivitycitations
- 2019Vibrational Fingerprinting of Defects Sites in Thin Films of Zeolitic Imidazolate Frameworkscitations
- 2019Efficient and highly transparent ultra-thin nickel-iron oxy-hydroxide catalyst for Oxygen evolution prepared by successive Ionic layer adsorption and reactioncitations
- 2018Kinetics of Lifetime Changes in Bimetallic Nanocatalysts Revealed by Quick X-ray Absorption Spectroscopycitations
- 2018Influence of Levulinic Acid Hydrogenation on Aluminum Coordination in Zeolite-Supported Ruthenium Catalystscitations
- 2018Quality control for Ziegler-Natta catalysis via spectroscopic fingerprintingcitations
- 2018Cathodic Electrodeposition of Ni−Mo on Semiconducting NiFe2 O4 for Photoelectrochemical Hydrogen Evolution in Alkaline Mediacitations
- 2018Silica deposition as an approach for improving the hydrothermal stability of an alumina support during glycerol aqueous phase reformingcitations
- 2017Decoding Nucleation and Growth of Zeolitic Imidazolate Framework Thin Films with Atomic Force Microscopy and Vibrational Spectroscopycitations
- 2017CO2 Hydrogenation over Pt-Containing UiO-67 Zr-MOFs—The Base Casecitations
- 2016ZrO2 is preferred over TiO2 as support for the Ru-catalyzed hydrogenation of levulinic acid to γ-Valerolactonecitations
- 2015Life and death of a single catalytic cracking particlecitations
- 2015Quantitative 3D Fluorescence Imaging of Single Catalytic Turnovers Reveals Spatiotemporal Gradients in Reactivity of Zeolite H-ZSM-5 Crystals upon Steamingcitations
- 2015X-ray Fluorescence Tomography of Aged Fluid-Catalytic-Cracking Catalyst Particles Reveals Insight into Metal Deposition Processescitations
- 2015Quantitative 3D fluorescence imaging of single catalytic turnovers reveals spatio-temporal gradients in reactivity of zeolite H-ZSM-5 crystals upon steaming
- 2013Stability of Pt/γ-Al2O3 catalysts in lignin and lignin model compound solutions under liquid phase reforming reaction conditions
- 2013Spatial Distribution of Zeolite ZSM-5 within Catalyst Bodies Affects Selectivity and Stability of Methanol-to-Hydrocarbons Conversioncitations
- 2013EXAFS as a tool to interrogate the size and shape of mono and bimetallic catalyst nanoparticlescitations
- 2012Combination of characterization techniques for atomic layer deposition MoO3 coatingscitations
- 2011Co3O4-SiO2 Nanocompositecitations
- 2010Profiling Physicochemical Changes within Catalyst Bodies during Preparationcitations
- 2009An iron molybdate catalyst for methanol to formaldehyde conversion prepared by a hydrothermal method and its characterization
- 2009Tomographic energy dispersive diffraction imaging to study the genesis of Ni nanoparticles in 3D within γ-Al2O3 catalyst bodies
- 2009Local and long range order in promoted iron-based Fischer–Tropsch catalysts: a combined in situ X-ray absorption spectroscopy/wide angle X-ray scattering study
- 2009Tomographic Energy Dispersive Diffraction Imaging To Study the Genesis of Ni Nanoparticles in 3D within gamma-Al2O3 Catalyst Bodiescitations
- 2008Geometric and electronic structure of alpha-oxygen sites in Mn-ZSM-5 zeolitescitations
- 2006Ray absorption Spectroscopy of Mn/Co/TiO2 Fischer-Tropsch catalystscitations
- 2006Highly mixed phases in ball-milled Cu/ZnO catalystscitations
- 2005Influence of support ionicity on the hydrogen chemisorption of Pt particles dispersed in Y zeolitecitations
- 2002A new templated ordered structure with combined micro- and mesopores and internal silica nanocapsulescitations
- 2002Plugged Hexagonal Mesoporous Templated Silica
Places of action
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article
Influence of Metal-Alkyls on Early-Stage Ethylene Polymerization over a Cr/SiO2 Phillips Catalyst
Abstract
<p>The Cr/SiO<sub>2</sub> Phillips catalyst has taken a central role in ethylene polymerization since its invention in 1953. The uniqueness of this catalyst is related to its ability to produce broad molecular weight distribution (MWD) PE materials as well as that no co-catalysts are required to attain activity. Nonetheless, co-catalysts in the form of metal-alkyls can be added for scavenging poisons, enhancing catalyst activity, reducing the induction period, and tailoring polymer characteristics. The activation mechanism and related polymerization mechanism remain elusive, despite extensive industrial and academic research. Here, we show that by varying the type and amount of metal-alkyl co-catalyst, we can tailor polymer properties around a single Cr/SiO<sub>2</sub> Phillips catalyst formulation. Furthermore, we show that these different polymer properties exist in the early stages of polymerization. We have used conventional polymer characterization techniques, such as size exclusion chromatography (SEC) and <sup>13</sup>C NMR, for studying the metal-alkyl co-catalyst effect on short-chain branching (SCB), long-chain branching (LCB) and molecular weight distribution (MWD) at the bulk scale. In addition, scanning transmission X-ray microscopy (STXM) was used as a synchrotron technique to study the PE formation in the early stages: allowing us to investigate the produced type of early-stage PE within one particle cross-section with high energy resolution and nanometer scale spatial resolution.</p>