Synergistic Effect Between Ca 4 V 4 O 14 and Vanadium‐Substituted Hydroxyapatite in the Oxidative Dehydrogenation of Propane
| Autor: | Frédéric Averseng, Guylène Costentin, Gwenaëlle Rousse, Yannick Millot, Dalil Brouri, Cyril Thomas, Sarah Petit, Stanislaw Dzwigaj, Jean-Marc Krafft, Christel Laberty-Robert |
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| Přispěvatelé: | Laboratoire de Réactivité de Surface (LRS), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Chimie du solide et de l'énergie (CSE), Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
010405 organic chemistry
[CHIM.ORGA]Chemical Sciences/Organic chemistry Organic Chemistry Vanadium chemistry.chemical_element Oxidative phosphorylation [CHIM.CATA]Chemical Sciences/Catalysis 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences law.invention Inorganic Chemistry chemistry.chemical_compound chemistry Propane law Dehydrogenation Physical and Theoretical Chemistry Electron paramagnetic resonance Nuclear chemistry |
| Zdroj: | ChemCatChem ChemCatChem, Wiley, 2021, 13 (18), pp.3995-4009. ⟨10.1002/cctc.202100807⟩ |
| ISSN: | 1867-3899 |
| DOI: | 10.1002/cctc.202100807⟩ |
| Popis: | International audience; The present work reports on a new type of V-based catalysts, namely V-substituted hydroxyapatites, and the influence of the synthesis conditions on their catalytic performance in the oxidative dehydrogenation of propane (ODHP) reaction. Vx-substituted hydroxyapatite materials prepared with the periodic addition of ammonia during the maturation step (Vx-HAp-pH-per) were shown to exhibit a Ca4V4O14 phase in addition to the V-substituted hydroxyapatite phase for x greater than or equal to 3.5. TEM characterization of the biphasic samples allowed us to demonstrate that the Ca4V4O14 phase was grown epitaxially on the Vx-HAp nanorods. The close intimacy between the two phases was confirmed by NMR suggesting to involvement of V 4+ species. Consistently EPR data of the fresh and spent samples showed that V 4+ species may be stabilized at the boundaries of these two phases. The strong promotion of the oxidative dehydrogenation reaction to propene observed from 723 K for the V4-HAp-pH-per composition is attributed to a synergistic effect between the Vx-HAp nanorods that enable the activation of propane and the Ca4V4O14 phase that helps the redox exchanges. This synergy may be attributed to an easier electron delocalization on the V4O14 units located at the phase's boundaries. |
| Databáze: | OpenAIRE |
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