| 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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Grunwaldt, Jan-Dierk
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (33/33 displayed)
- 2024Highly loaded bimetallic iron-cobalt catalysts for hydrogen release from ammoniacitations
- 2024Lifecycle of Pd Clusters: Following the Formation and Evolution of Active Pd Clusters on Ceria During CO Oxidation by In Situ/Operando Characterization Techniques
- 2024Unveiling the synergistic effects of pH and Sn content for tuning the catalytic performance of Ni^0/Ni_{x}Sn_{y} intermetallic compounds dispersed on Ce-Zr mixed oxides in the aqueous phase reforming of ethylene glycol
- 2024Pd loading threshold for an efficient noble metal use in Pd/CeO2 methane oxidation catalystscitations
- 2023Green methanol from renewable feeds : Towards scalable catalyst synthesis and improved stability
- 2021Design of bimetallic Au/Cu nanoparticles in ionic liquids: Synthesis and catalytic properties in 5‐(hydroxymethyl)furfural oxidationcitations
- 2020Dynamic structural changes of supported Pd, PdSn, and PdIn nanoparticles during continuous flow high pressure direct H$_{2}$O$_{2}$ synthesiscitations
- 2020Reduction and carburization of iron oxides for Fischer–Tropsch synthesiscitations
- 2020Optimizing Ni-Fe-Ga alloys into Ni$_{2}$FeGa for the hydrogenation of CO$_{2}$ into methanolcitations
- 2020Optimizing Ni-Fe-Ga alloys into Ni 2 FeGa for the hydrogenation of CO 2 into methanolcitations
- 2020Structural dynamics of an iron molybdate catalyst under redox cycling conditions studied with in situ multi edge XAS and XRDcitations
- 2020Microfluidic Crystallization of Surfactant-Free Doped Zinc Sulfide Nanoparticles for Optical Bioimaging Applicationscitations
- 2019Impact of Preparation Method and Hydrothermal Aging on Particle Size Distribution of $Pt/γ-Al_{2}O_{3}$ and Its Performance in CO and NO Oxidationcitations
- 2019Supported Intermetallic PdZn Nanoparticles as Bifunctional Catalysts for the Direct Synthesis of Dimethyl Ether from CO-Rich Synthesis Gascitations
- 2019Chemical Nature of Microfluidically Synthesized AuPd Nanoalloys Supported on TiO2citations
- 2019Mapping the Pore Architecture of Structured Catalyst Monoliths from Nanometer to Centimeter Scale with Electron and X-ray Tomographiescitations
- 2019NH$_{3}$-SCR over V-W/TiO$_{2}$ Investigated by Operando X-ray Absorption and Emission Spectroscopycitations
- 2018Tuning the $mathrm{Pt/CeO_{2}}$ Interface by in Situ Variation of the Pt Particle Sizecitations
- 2018Hydrotreatment of Fast Pyrolysis Bio-oil Fractions Over Nickel-Based Catalystcitations
- 2018Synthesis and Regeneration of Nickel-Based Catalysts for Hydrodeoxygenation of Beech Wood Fast Pyrolysis Bio-Oilcitations
- 2018Synthesis and Regeneration of Nickel-Based Catalysts for Hydrodeoxygenation of Beech Wood Fast Pyrolysis Bio-Oil
- 2017Comparison of the Catalytic Performance and Carbon Monoxide Sensing Behavior of Pd-SnO$_2$ Core@Shell Nanocompositescitations
- 2016Influence of gas atmospheres and ceria on the stability of nanoporous gold studied by environmental electron microscopy and in situ ptychography
- 2016Influence of gas atmospheres and ceria on the stability of nanoporous gold studied by environmental electron microscopy and in situ ptychographycitations
- 2014In situ observation of Cu-Ni alloy nanoparticle formation by X-ray diffraction, X-ray absorption spectroscopy, and transmission electron microscopy: Influence of Cu/Ni ratiocitations
- 2014Intermetallic compounds of Ni and Ga as catalysts for the synthesis of methanolcitations
- 2014Intermetallic compounds of Ni and Ga as catalysts for the synthesis of methanolcitations
- 2014Flame-made Cu/ZnO/Al2O3 catalyst for dimethyl ether productioncitations
- 2012CO hydrogenation to methanol on Cu–Ni catalystscitations
- 2012CO hydrogenation to methanol on Cu–Ni catalysts:Theory and experimentcitations
- 2011Flame spray synthesis of CoMo/Al2O3 hydrotreating catalystscitations
- 2009Catalysts at work: From integral to spatially resolved X-ray absorption spectroscopycitations
- 2007Combination of flame synthesis and high-throughput experimentation: the preparation of alumina-supported noble metal particles and their application in the partial oxidation of methanecitations
Places of action
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article
Flame spray synthesis of CoMo/Al2O3 hydrotreating catalysts
Abstract
The first alumina supported and unsupported cobalt molybdenum hydrotreating catalysts have been prepared by one-step flame spray pyrolysis (FSP) by spraying and combusting tris(acetylacetonato)aluminum, cobalt 2-ethylhexanoate and molybdenum 2-ethylhexaoate dissolved in toluene. The oxide particles produced contained varying amounts of transition metals (8, 16, 24 and 32wt.% Mo with atomic ratio Co/Mo=1/3 and 16wt.% Mo with atomic ratios Co/Mo=2/3 and 1/1) with alumina constituting the balance. In addition, an unsupported reference catalyst (atomic ratio Co/Mo=1/3) was produced. The particles obtained consisted mostly of γ-Al2O3 with some CoAl2O4, as evidenced by X-ray diffraction (XRD) and UV–vis spectroscopy. Bulk MoO3 was not detected by XRD, except at the highest molybdenum content (32wt.%) and in the unsupported sample, indicating that molybdenum is well dispersed on the surface of the support. The specific surface area as measured by nitrogen adsorption (BET) decreased from 221 to 90m2/g when going from the lowest loading supported catalyst (8wt.%) to the unsupported reference. Transmission electron microscopy (TEM) images showed that at low molybdenum loadings nanoparticle agglomerates with 5–10nm primary particles were produced. As the molybdenum loading on the alumina was increased from 8 to 32wt.% and for the unsupported reference the primary particle size increased to up to 20nm and the morphology became more irregular due to primary particle sintering and aggregation.After activation by sulfidation the activity of the catalysts were measured for the three hydrotreating reactions hydrodesulfurization, hydrodenitrogenation and hydrogenation using a model oil containing dibenzothiophene, indole and naphthalene in n-heptane solution. The best catalyst was the FSP-produced material containing 16wt.% Mo (atomic ratio Co/Mo=1/3), which did not contain crystalline MoO3 and only small amounts of CoAl2O4. The hydrotreating activity was approximately 75% of that of commercial cobalt molybdenum catalysts prepared by wet impregnation of pre-shaped alumina extrudates. Since the commercial catalyst is the product of years of development, this shows the potential of the flame spray pyrolysis technique.The Co–Mo–S phase, active for hydrotreating, is formed upon sulfidation of the flame made oxide precursor. TEM images of the spent catalysts showed that as the metal loading was increased from 8 to 32wt.% Mo the average length of supported MoS2 entities increased from 3 to 4nm (for the unsupported catalyst it was 8.5nm), while the average number of MoS2 layers per particle increased from 1.1 to 2.5. The increase in MoS2 particle size resulted in lower activity.