| 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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Frenken, Joost W. M.
University of Groningen
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2022Ultrathin, sputter-deposited, amorphous alloy films of ruthenium and molybdenumcitations
- 2022Ultrathin, sputter-deposited, amorphous alloy films of ruthenium and molybdenumcitations
- 2017Observing the oxidation of platinumcitations
- 2016Instability of NiMoS2 and CoMoS2 Hydrodesulfurization Catalysts at Ambient Conditionscitations
- 2016Instability of NiMoS 2 and CoMoS 2 Hydrodesulfurization Catalysts at Ambient Conditions: A Quasi in Situ High-Resolution Transmission Electron Microscopy and X-ray Photoelectron Spectroscopy Studycitations
- 2014The ReactorSTMcitations
- 2011A general model of metal underpotential deposition in the presence of thiol-based additives based on an in situ STM studycitations
- 2010Ultrahigh vacuum/high-pressure flow reactor for surface x-ray diffraction and grazing incidence small angle x-ray scattering studies close to conditions for industrial catalysiscitations
Places of action
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article
Instability of NiMoS2 and CoMoS2 Hydrodesulfurization Catalysts at Ambient Conditions
Abstract
<p>The effect of exposure to ambient air of MoS<sub>2</sub>-based, γ-Al<sub>2</sub>O<sub>3</sub>-supported, hydrodesulfurization (HDS) catalysts has been studied using high-resolution transmission electron microscopy (HRTEM). Analysis of unpromoted as well as Ni- and Co-promoted MoS<sub>2</sub> samples showed that the number of MoS<sub>2</sub> slabs and the average slab length decreased as a function of air exposure time. A parallel X-ray photoelectron spectroscopy (XPS) study showed this effect to be due to oxidation. During the first 24 h of exposure to air, all 1 bar sulfided (Ni/Co)MoS<sub>2</sub> samples showed an initial slab length decrease of approximately 20%. After an additional month in air, the slabs had deteriorated significantly further. A sample of CoMoS<sub>2</sub> sulfided at 30 bar showed a slightly enhanced effect of oxidation, particularly after the first 5 min in air. The combined HRTEM and XPS results lead to the proposal of the formation of a protective oxide ring around the remaining sulfidic species inside the MoS<sub>2</sub> slabs to explain the mechanism of this oxidation process. The data obtained in this study emphasize the general necessity of shielding vulnerable catalyst samples from air during preparation and characterization, a message relevant in all fields of research related to catalysis.</p>