• Article dans une revue

Revisiting active sites in heterogeneous catalysis: Their structure and their dynamic behaviour

Jacques C. Vedrine

This short review article aims at revisiting the description of active sites in heterogeneous catalysis on solid surfaces and their role in catalyst activity and selectivity. Special emphasis is brought to: (i) structure of the solid surface; (ii) importance of active site isolation on the surface…

Applied Catalysis A : General, 2014, 474, pp.40-50. ⟨10.1016/j.apcata.2013.05.029⟩. ⟨hal-01121663⟩

• Article dans une revue

On the promoting effect of Au on CO oxidation kinetics of Au-Pt bimetallic nanoparticles supported on SiO2: An electronic effect?

Rachel P. Doherty, Jean-Marc Krafft, Christophe Méthivier, Sandra Casale, Hynd Remita, Catherine Louis, Cyril Thomas

Bimetallic AuPt nanoparticles prepared by radiolysis with Au/Pt atomic ratios of 1.2 and 1.8 were deposited onto silica and calcined to remove the stabilizing polymers. During this sequence, they lose their core-shell structure and restructure as alloys. FTIR and XPS provide evidence for further…

Journal of Catalysis, 2011, 287, pp.102-113. ⟨hal-00687283⟩

• Article dans une revue

Size-induced structural modifications affecting Co3O4 nanoparticles patterned in SBA-15 silicas

Anne Davidson, Irene Lopez, Nissrine El Hassan, Hadjira Guerba, Gilles Wallez

The structure of Co3O4 nanoparticles patterned in SBA-15 silicas is studied. With pore size of 7.3 nm, bundles of oriented particles, with (400) plane parallel to the hexagonal axis, is revealed by HR-TEM. With decreasing pore sizes, structural modifications, suggested by HR-TEM are confirmed by…

Chemistry of Materials, 2006, 18, pp.5828. ⟨hal-00128555⟩

• Article dans une revue

Influence of the morphology and impurities of Ni(OH)2 on the synthesis of neutral Ni(II)–amino acid complexes

Vicente Rodriguez-Gonzalez, E. Marceau, Michel Che, Claude Pepe

Journal of Solid State Chemistry, 2007, 180 (12), pp.3469-3478. ⟨10.1016/j.jssc.2007.10.015⟩. ⟨hal-03032187⟩

• Article dans une revue

Photocatalytic Hydrogen Evolution Using Ni–Pd/TiO 2 : Correlation of Light Absorption, Charge-Carrier Dynamics, and Quantum Efficiency

Ana Luna, Diana Dragoe, Kunlei Wang, Patricia Beaunier, Ewa Kowalska, Bunsho Ohtani, Daniel Bahena Uribe, Miguel A. Valenzuela, Hynd Remita, Christophe Colbeau-Justin

TiO2 surface modification with bimetallic nano particles (NPs) has demonstrated to be a strategy to enhance the hydrogen generation via photocatalysis and to minimize the use of expensive noble metals. A better understanding of the role of bimetallic NPs is of crucial importance to design efficient…

Journal of Physical Chemistry C, 2017, 121 (26), pp.14302 - 14311. ⟨10.1021/acs.jpcc.7b01167⟩. ⟨hal-01652005⟩

• Article dans une revue

Relevant parameters for obtaining high-surface area materials by delamination of magadiite, a layered sodium silicate

Yunfei Bi, Jean-François Lambert, Yannick Millot, Sandra Casale, Juliette Blanchard, Shuangqin Zeng, Hong Nie, Dadong Li

Layered silicates can be used for the preparation of high surface area materials by intercalation with organic cations followed by ultrasonication. The relevant parameters for delamination (exfoliation) of cetyltrimethylammonium bromide exchange magadiite are investigated. Using a magadiite wet…

Journal of Materials Chemistry, 2011, 21, pp.18403-18411. ⟨10.1039/C1JM13108G⟩. ⟨hal-00668932⟩

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Characterization and catalytic activity of Mn (salen) immobilized on silica by various strategies

Khalil Tesnime Abou, Chaaben Semy Ben, Boujday Souhir, Bergaoui Latifa

Different strategies were applied to prepare supported Mn(salen) on fumed silica and to explore the effect of the interaction nature between the active sites and the surface on the catalytic activity. Direct and multistep grafting methods were used: the silica surface was silylated and the metal…

IOSR Journal of Applied Chemistry, 2015, 8, pp.36-45. ⟨10.9790/5736-08113645⟩. ⟨hal-01133157⟩

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The catalytic activity of Fe-containing SiBEA zeolites in Fischer–Tropsch synthesis

Karolina A. Chalupka, Waldemar Maniukiewicz, Pawel Mierczynski, Tomasz Maniecki, Jacek Rynkowski, Stanislaw Dzwigaj

tThis work is focused on catalytic activity of Red-C-FexSiBEA zeolites in Fischer–Tropsch synthesis. TheFe-containing zeolites were obtained by two-step post-synthesis method, which allowed incorporatingthe metal ions into zeolite framework and in this way to obtain materials with new…

Catalysis Today, 2015, 257, pp.117-121. ⟨10.1016/j.cattod.2015.02.017⟩. ⟨hal-01226533⟩

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Al-Mn-silicate nanobubbles phase as an intermediate in zeolite formation

Amal Bejar, Semy Ben Chaabene, Maguy Jaber, Jean-François Lambert, Latifa Bergaoui

Manganese (II) carbonate, silicic acid and aluminum nitrate were treated hydrothermally at different temperatures (120–210°C) and for different durations (6–72 h) in an aqueous basic medium. Different compositions of starting mixtures were used. The synthetized materials were characterized by…

Applied Clay Science, 2016, 123, pp.202 - 209. ⟨10.1016/j.clay.2016.01.025⟩. ⟨hal-01548120⟩

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Self-Assembly of Fatty Acids on Hydroxylated Al Surface and Effects of Their Stability on Wettability and Nanoscale Organization

Irma Liascukiene, Marie Steffenhagen, Svajus J. Asadauskas, Jean-François Lambert, Jessem Landoulsi

The self-assembly of fatty acids (FA) on the surfaces of inorganic materials is a relevant way to control their wetting properties. While the mechanism of adsorption on model flat substrate is well described in the literature, interfacial processes remain poorly documented on nanostructured…

Langmuir, 2014, 30 (20), pp.5797-5807. ⟨10.1021/la404756y⟩. ⟨hal-01121646⟩