Laboratoire de réactivité de surface

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New routes of preparation of active and stable mesoporous Ni-alumina based catalysts for methane dry reforming and CO2 methanation, Nouvelles voies de préparation de catalyseurs actifs et stables à base de Ni-alumine mésoporeuse pour le reformage à sec du méthane et la méthanation du CO2

Leila Karam

Dry reforming of methane (DRM) is a process that converts CH4 and CO2 gases into syngas, a gaseous mixture of H2 and CO. Ni based catalysts proved to be suitable for the reaction due to their good activity, wider availability and lower cost than noble-based materials. However, these catalysts are…, Le reformage à sec du méthane (DRM) est un processus qui convertit simultanément CH4 et CO2 en un mélange gazeux de H2 et de CO appelé syngas. Les catalyseurs à base de Ni sont particulièrement prometteurs mais ils ne sont pas stables en raison du frittage du Ni et du dépôt de coke. Dans cette…

Catalysis. Sorbonne Université; Université de Balamand (Tripoli, Liban), 2019. English. ⟨NNT : 2019SORUS163⟩. ⟨tel-03141292⟩

  • Article dans une revue

On the influence of water traces on the acidity measurement of amorphous aluminosilicates

Juliette Blanchard, Jean-Marc Krafft, Colin Dupont, Céline Sayag, Toshikazu Takahashi, Hiroyuki Yasuda

For the measurement of their acidity, amorphous aluminosilicates are beforehand treated at temperature of 450 • C or higher in order to remove water adsorbed on their surface. We will show in this study that, during the standard course of an acidity measurement by low temperature CO adsorption,…

Catalysis Today, 2014, 226, pp.89-96. ⟨10.1016/j.cattod.2013.10.054⟩. ⟨hal-01226880⟩

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Molecular mechanism of barnacle adhesion : a structural approach and underlying biochemistry, Mécanisme moléculaire de l'adhésion des balanes : approche structurale et biochimie sous-jacente

Sunyoung Hur

Barnacles adhere themselves robustly and permanently to diverse underwater substrates through strong interactions of a multi-protein complex layer called the “cement”. However, the intermolecular interactions responsible for the strong adhesive properties of the barnacle cement remains poorly…, Les balanes adhèrent de manière robuste et permanente à divers substrats sous-marins grâce à de fortes interactions d’une couche complexe multiprotéique appelée « ciment ». Cependant, les interactions intermoléculaires responsables des fortes propriétés adhésives du ciment de bernacle restent mal…

Material chemistry. Sorbonne Université; Nanyang Technological University (Singapour), 2022. English. ⟨NNT : 2022SORUS572⟩. ⟨tel-04318937⟩

  • Article dans une revue

Structure–Activity Relationship in Manganese Perovskite Oxide Nanocrystals from Molten Salts for Efficient Oxygen Reduction Reaction Electrocatalysis

Francisco Gonell, Carlos M Sánchez-Sánchez, Vincent Vivier, Christophe Méthivier, Christel Laberty-Robert, David Portehault

We report a synthesis pathway in molten salts toward ligand-free nanoparticles of the layered perovskite La0.5Sr1.5MnO4 (l-LSMO) and of the pseudocubic perovskite La0.7Sr0.3MnO3 (pc-LSMO). These particles are readily implemented as oxygen reduction reaction (ORR) electrocatalysts in alkaline…

Chemistry of Materials, 2020, 32 (10), pp.4241-4247. ⟨10.1021/acs.chemmater.0c00681⟩. ⟨hal-02767098⟩

  • Article dans une revue

A straightforward approach to high purity sodium silicide Na4Si4

Yang Song, Isabel Gómez-Recio, Ram Kumar, Cristina Coelho Diogo, Sandra Casale, Isabelle Génois, David Portehault

Sodium silicide Na4Si4 is a reductive and reactive source of silicon highly relevant to designing non-oxidic silicon materials, including clathrates, various silicon allotropes, and metal silicides. Despite the impor-tance of this compound, its production in high amounts and high purity is still a…

Dalton Transactions, 2021, 50 (45), pp.16703-16710. ⟨10.1039/D1DT03203H⟩. ⟨hal-03537395⟩

  • Article dans une revue

Hierarchical Self-Assembly of Polyoxometalate-Based Organo Palladium(II) Metallomacrocycles via Electrostatic Interactions

Raphaël Salles, Benjamin Abécassis, Etienne Derat, Dalil Brouri, Aurélie Bernard, Qichun Zhang, Anna Proust, Christophe Desmarets, Guillaume Izzet

The design and synthesis of a supramolecular square composed of polyoxometalate-based hybrid donors and ethylenediamine palladium(II) nodes are reported. The structure of the metallomacrocycle scaffold was inferred by diffusion NMR, small-angle X-ray scattering (SAXS), and molecular modeling. The…

Inorganic Chemistry, 2020, 59 (4), pp.2458--2463. ⟨10.1021/acs.inorgchem.9b03333⟩. ⟨hal-02887768⟩

  • Thèse

Electrochemical energy storage : evaluation of the efficiency of different ionicliquids as electrolytes for sodium-ion batteries, Stockage électrochimique de l'énergie : évaluation de l'efficacité de différents liquides ioniques comme électrolytes pour les batteries sodium-ion

Leandro Souza Domingues

The aim of this doctoral research project is to evaluate the effectiveness of different nitrogen and phosphorus based ionic liquids (ILs) as electrolytes for sodium-ion batteries (SIBs) as an alternative to conventional electrolytes based on volatile organic solvents, and to study the effect of…, L'objectif de ce projet de recherche doctorale est d'évaluer l'efficacité de différents liquides ioniques (LI) à base d'azote et de phosphore en tant qu'électrolytes pour les batteries sodium-ion (SIB), comme alternative aux électrolytes conventionnels à base de solvants…

Theoretical and/or physical chemistry. Sorbonne Université; Universidade de São Paulo (Brésil), 2024. English. ⟨NNT : 2024SORUS603⟩. ⟨tel-05007255⟩

  • Article dans une revue

EXAFS spectroscopy as a tool to probe metal–support interaction and surface molecular structures in oxide-supported catalysts: application to Al2O3-supported Ni(ii) complexes and ZrO2-supported tungstates

Xavier Carrier, Eric Marceau, Hugo Carabineiro, Vicente Rodríguez-González, Michel Che

EXAFS spectroscopy is shown as a tool of prime importance to probe the formation of metal–oxygen–support bonds and unravel the surface molecular structure in oxide-supported systems through two examples: (i) a molecular metal complex (Ni(II) bisglycinate) characterized after impregnation and drying…

Physical Chemistry Chemical Physics, 2009, 11, pp.7527-7539 ⟨10.1039/b822969d⟩. ⟨hal-01496028⟩

  • Article dans une revue

Formation of heteropolymolybdates during the preparation of Mo and NiMo HDS catalysts supported on SBA-15: Influence on the dispersion of the active phase and on the HDS activity

Alvaro Sampieri, Stephane Pronier, Sylvette Brunet, Xavier Carrier, Catherine Louis, Juliette Blanchard, Katia Fajerwerg, Michele Breysse

Mo and Ni-Mo sulfides in SBA-15 and Al-SBA-15 catalysts were prepd. by incipient wetness co-impregnation of molybdenum and nickel precursors (followed by thermal treatment under He at 823 K) and sulfidation under 10% H2S/H2 at 673 K. Only incipient wetness impregnation of Mo on pure silica SBA-15…

Microporous and Mesoporous Materials, 2010, 130 (1-3), pp.130-141. ⟨10.1016/j.micromeso.2009.10.024⟩. ⟨hal-00604795⟩

  • Article dans une revue

Chemical nature and thermal decomposition behavior of tartaric acid multilayers on rutile TiO 2 (110)

Elisa Meriggio, Rémi Lazzari, Christophe Méthivier, Pascal David, Stéphane Chenot, Xavier Carrier, Gregory Cabailh, Vincent Humblot

R,R-tartaric acid (RR-TA) thermal stability and decomposition on the rutile TiO2(110) surface was investigated by temperature programmed desorption. The authors show that a majority of RR-TA molecules are desorbed intact from multilayers at around 340 K, while they decompose from the first…

Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures, 2019, 37 (5), pp.051803. ⟨10.1116/1.5100957⟩. ⟨hal-02340226⟩