| 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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Hensen, Emiel, J. M.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2023Hemicellulosic Sugars and Lignincitations
- 2023Stability of In2O3 Nanoparticles in PTFEcontaining Gas Diffusion Electrodes for CO2 electroreduction to Formatecitations
- 2023A study of Cu-Rh electrodeposition**citations
- 2023Evolution of bismuth oxide catalysts during electrochemical CO2 reductioncitations
- 2023Role of strontium cations in ZSM-5 zeolite in the methanol-to-hydrocarbons reactioncitations
- 2022Alumina-Supported NiMo Hydrotreating CatalystsAspects of 3D Structure, Synthesis, and Activitycitations
- 2021Twin boundary migration in an individual platinum nanocrystal during catalytic CO oxidationcitations
- 2021Stabilization Effects in Binary Colloidal Cu and Ag Nanoparticle Electrodes under Electrochemical CO2 Reduction Conditionscitations
- 2018Temperature-programmed plasma surface reactioncitations
- 2006Characterization and reactivity of Ga+ and GaO+ cations in zeolite ZSM-5citations
- 2003Characterization of Ga/HZSM-5 and Ga/HMOR synthesized by chemical vapor deposition of trimethylgalliumcitations
Places of action
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article
Alumina-Supported NiMo Hydrotreating CatalystsAspects of 3D Structure, Synthesis, and Activity
Abstract
Preparation conditions have a vital effect on the structure of alumina-supported hydrodesulfurization (HDS) catalysts. To explore this effect, we prepared two NiMoS/Al2O3 catalyst samples with the same target composition using different chemical sources and characterizing the oxidic NiMo precursors and sulfided and spent catalysts to understand the influence of catalyst structure on performance. The sample prepared from ammonium heptamolybdate and nickel nitrate (sample A) contains Mo in the oxidic precursor predominantly in tetrahedral coordination in the form of crystalline domains, which show low reducibility and strong metal–support interactions. This property influences the sulfidation process such that the sulfidation processes of Ni and Mo occur tendentially separately with a decreased efficiency to form active Ni–Mo–S particles. Moreover, inactive unsupported MoS2 particles or isolated NiSx species are formed, which are either washed off during catalytic reaction or aggregated to larger particles as seen in scanning transmission electron microscopy/energy-dispersive X-ray spectroscopy (STEM/EDX). The oxidic precursor of the sample synthesized using nickel carbonate and molybdenum trioxide as metal sources (sample B), however, contains Mo in octahedral coordination and shows higher reducibility of the metal species as well as weaker metal–support interactions than that of sample A; these properties allow an efficient sulfidation of Mo and Ni such that formation of active Ni–Mo–S particles is the main product. Ptychographic X-ray computed tomography (PXCT) and STEM and EDX measurements show that the structure formed during sulfidation is stable under operation conditions. The structural differences explain the HDS activity difference between these two samples and explain why sample B is much active than sample A.