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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
Combined in Situ X-ray Powder Diffractometry/Raman Spectroscopy of Iron Carbide and Carbon Species Evolution in Fe(-Na-S)/α-Al2O3Catalysts during Fischer-Tropsch Synthesis
Abstract
<p>A Na-S promoted Fe-based Fischer-Tropsch synthesis (FTS) catalyst converts a H2/CO gas mixture into hydrocarbons with enriched C2-C4 olefin content. Above 300 °C, the carbon-depositing Boudouard reaction competes with the FTS reaction for CO as reactant. By making use of a combined in situ X-ray powder diffractometry (XRPD)/Raman spectroscopy setup, the simultaneous evolution of the FexOy/α-Fe/FexC phases and various formed carbon species has been monitored at 340 °C and 10 bar. CO carburized, Na-S promoted and unpromoted Fe(-Na-S)/α-Al2O3 catalysts were investigated. The various Fe phases present were quantified with Rietveld quantitative phase analysis (R-QPA) from the in situ collected XRPD patterns. The observed D- A nd G-bands in the in situ Raman spectra were analyzed for their relative intensities, band widths, and positions and compared to reference carbon materials. It was found that amorphous carbon with C sp3 and C sp2 in chain-like ordering evolved toward carbon nanofiber-like structures during FTS. Na-S promotion and initial CO carburization at temperatures ≥340 °C led to an increased amount of cyclic sixfold C sp2 species. Preliminary carbon deposits present in the catalysts decreased the initial fast increase of the Raman band intensities, while Na-S promotion increased Raman band intensity growth after the initial fast increase period. The carbon species evolution was unaffected by the presence of specific Fe carbides or by carbide-to-carbide transitions. Na-S promotion aided in the reduction of Fe3O4 by (H2:)CO to carbon-depositing Fe carbides. The results obtained add to our further understanding on the role of Fe and carbon species during a high-temperature FTS reaction. </p>