| 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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Monai, Matteo
Utrecht University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2023Restructuring of titanium oxide overlayers over nickel nanoparticles during catalysiscitations
- 2020Structure Sensitivity in Steam and Dry Methane Reforming over Nickelcitations
- 2020Structure Sensitivity in Steam and Dry Methane Reforming over Nickel: Activity and Carbon Formation
- 2018Supported Mn3O4Nanosystems for Hydrogen Production through Ethanol Photoreformingcitations
- 2018Smart Pd Catalyst with Improved Thermal Stability Supported on High-Surface-Area LaFeO3Prepared by Atomic Layer Depositioncitations
- 2017The water gas shift reaction over Pt–CeO2 nanoparticles confined within mesoporous SBA-16citations
- 2016H2 production by photocatalytic reforming of oxygenated compounds using TiO2-based materialscitations
- 2015Methane Catalytic Combustion over Hierarchical Pd@CeO2/Si-Al2O3: Effect of the Presence of Watercitations
Places of action
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article
Structure Sensitivity in Steam and Dry Methane Reforming over Nickel
Abstract
<p>Hydrogen is currently mainly produced via steam reforming of methane (SMR: CH<sub>4</sub> + H<sub>2</sub>O → CO + 3H<sub>2</sub>). An alternative to this process, utilizing carbon dioxide and thus potentially mitigating its environmentally harmful emissions, is dry methane reforming (DMR: CH<sub>4</sub> + CO<sub>2</sub> → 2CO + 2H<sub>2</sub>). Both of these reactions are structure sensitive, that is, not all atoms in a catalytic metal nanoparticle have the same activity. Mapping this structure sensitivity and understanding its mechanistic workings provides ways to design better, more efficient, and more stable catalysts. Here, we study a range of SiO<sub>2</sub>-supported Ni nanoparticles with varying particle sizes (1.2-6.0 nm) by operando infrared spectroscopy to determine the active mechanism over Ni (carbide mechanism) and its kinetic dependence on Ni particle size. We establish that Ni particle sizes below 2.5 nm lead to a different structure sensitivity than is expected from and implied in literature. Because of the identification of CH<sub>x</sub>D<sub>x</sub> species with isotopically labeled experiments, we show that CH<sub>4</sub> activation is not the only rate-limiting step in SMR and DMR. The recombination of C and O or the activation of CO is likely also an important kinetically limiting factor in the production of synthesis gas in DMR, whereas for SMR the desorption of the formed CO becomes more kinetically limiting. Furthermore, we establish the Ni particle size dependence of carbon whisker formation. The optimal Ni particle size both in terms of activity for SMR and DMR, at 500 and 600 °C, and 5 bar, was found to be approximately 2-3 nm, whereas carbon whisker formation was found to maximally occur at approximately 4.5 nm for SMR and for DMR increased with increasing particle size. These results have direct practical applications for tuning of activity and selectivity of these reactions, while providing fundamental understanding of their working.</p>