A5074890355- Zeolite Catalysis and Synthesis
- Chemical Synthesis and Characterization
- X-ray Diffraction in Crystallography
- Mesoporous Materials and Catalysis
- Metal-Organic Frameworks: Synthesis and Applications
- Crystallization and Solubility Studies
- Advanced NMR Techniques and Applications
- Catalytic Processes in Materials Science
- Crystal Structures and Properties
- Polyoxometalates: Synthesis and Applications
- Magnetism in coordination complexes
- Adsorption and biosorption for pollutant removal
- Layered Double Hydroxides Synthesis and Applications
- Catalysis and Hydrodesulfurization Studies
- Solid-state spectroscopy and crystallography
- Catalysis and Oxidation Reactions
- Synthesis and Properties of Aromatic Compounds
- Inorganic Fluorides and Related Compounds
- Crystallography and molecular interactions
- Membrane Separation and Gas Transport
- Ammonia Synthesis and Nitrogen Reduction
- Carbon Nanotubes in Composites
- Chemical and Physical Properties of Materials
- Pigment Synthesis and Properties
- Fullerene Chemistry and Applications
Université de Haute-Alsace
2016-2025
Université de Strasbourg
2017-2025
Centre National de la Recherche Scientifique
2015-2024
Institut de Sciences des Matériaux de Mulhouse
2014-2024
Centre Hospitalier de Mulhouse
2020
Laboratoire de Photochimie et d'Ingénierie Macromoléculaire
1996-2017
École nationale supérieure de chimie de Mulhouse
2000-2010
IFP Énergies nouvelles
2004-2007
Institut Français
2004
École Nationale Supérieure de Chimie de Montpellier
2003
Stable zeolites that have larger pore apertures and a three-dimensional topology are of interest because they could be used to adsorb molecules, particularly for application in oil refining. Several large-pore zeolitic materials with channels formed by openings more than 12 rings known, but all them one-dimensional channel system limits their use catalysis. We report the synthesis some characterizations IM-12, thermally stable germanium-containing zeolite contains first two-dimensional...
IM-20 is a novel microporous germanosilicate with an interesting zeolitic structure. It has been prepared via the fluoride route 3-butyl-1-methyl-3H-imidazol-1-ium as organic structure-directing agent and its structure solved from synchrotron powder X-ray diffraction data. The chemical formula per unit cell Si(42.2)Ge(17.8)O(120) under calcined form. possesses new framework topology, 3D channel system being formed by straight intersecting 12- 10-membered rings. Two types of d4r composite...
We report a structural and thermodynamic investigation of the phase behavior Ga(OH,F)-MIL-53, gallium-based metal–organic framework (MOF) having MIL-53 topology containing 0.7 wt % fluorine bonded to metal. Despite some small differences, especially for hydrated form, overall physical chemistry Ga(OH,F)-MIL-53 is very similar standard free Ga-MIL-53 material. A combination in situ X-ray diffraction, Fourier transform infrared spectroscopy, differential scanning calorimetry, heat capacity...
The synthesis and the structure of IM-17, a new germanosilicate with novel zeolitic topology, prepared hydrothermally decamethonium as organic directing agent, are reported. calcined partially rehydrated IM-17 chemical formula per unit cell |(H2O)14.4|[Si136.50Ge39.50O352] was solved ab initio using electron diffraction ADT data in acentric Amm2 (setting Cm2m) space group refined by Rietveld method. This zeolite framework type contains 3D pore system made intersecting 12, 10 8-ring channels.
Zeolitic Imidazolate Frameworks (ZIFs) represent a thriving subclass of metal–organic frameworks (MOFs) owing to the large variety their topologies, which some them are common with zeolites, and ability modulate chemistry as well hydrophobicity/hydrophilicity balance, making perfect examples isoreticular concept. One peculiar structural feature ZIFs is potential for transitions by rotation (or swing) linkers under external stimuli (guest adsorption, mechanical constraints, etc.). This...
The synthesis of ZIF-25 was successfully optimized by using acetic acid as a modulator agent, yielding highly crystalline material. product exhibits significant porosity, thermal stability up to 300 °C, and hydrophobicity, making it ideal for use in lyophobic heterogeneous systems (LHSs). Notably, the crystal structure refined first time Rietveld method fully reported space group Pm3̅m. Energetic performance evaluation intrusion–extrusion experiments shows that "ZIF-25–water" system...
Water intrusion-extrusion isotherms performed at room temperature on hydrophobic pure silica chabazite show that the water-Si-CHA system displays real spring behavior. However, differences in pressure-volume diagrams are observed between first and other cycles, indicating some water molecules interact with inorganic framework after intrusion. (29)Si especially (1)H solid-state NMR showed creation of new defect sites upon existence two kinds trapped supercage Si-CHA: a layer strongly hydrogen...
To study the energetic performance of 1D 12-membred-ring pure silica ITQ-4 zeolite (IFR topology), a high-pressure water intrusion−extrusion isotherm at room temperature was performed. The pressure−volume diagram indicates an irreversible phenomenon, molecules remaining confined in micropores. Therefore, "water−ITQ-4" system appears to behave as bumper. intrusion pressure and intruded volume are 42 MPa 0.136 mL/g, respectively. Investigations on samples by 29Si 1H solid-state NMR...
Metal−organic framework-type Al-, Ga-, and Ga(OH,F)-MIL-53 have been characterized by solid-state NMR powder X-ray diffraction (PXRD). 1H 2D double-quantum–single-quantum (DQ–SQ) magic angle spinning (MAS) experiments unambiguously evidence two inequivalent water molecules in Al-MIL-53_np_H2O. A careful reinvestigation of the XRD structure hydrated Al-MIL-53 proves, for first time, doubling unit cell supporting presence molecules. One type molecule is located channel, interacting with...
The energy performances of pure-silica LTA-type zeosil were studied by intrusion–extrusion water and concentrated aqueous solutions LiCl. LTA structure is characterized a highly symmetrical three-dimensional pore system that consists large cages separated eight-membered-ring openings. zeosil–water exhibits bumper behavior with an intrusion pressure 20 MPa absorption 3.4 J g–1. Despite the small openings (0.41 × 0.41 nm2), value one lowest obtained among all zeosils to date. explained...
A new medium-pore germanosilicate, denoted IM-18, with a three-dimensional 8 × 10-ring channel system, has been prepared hydrothermally using 4-dimethylaminopyridine as an organic structure-directing agent (OSDA). Due to the presence of stacking disorder, structure elucidation IM-18 was challenging, and combination different techniques, including electron diffraction, high-resolution transmission microscopy (HRTEM), Rietveld refinement synchrotron powder diffraction data, necessary elucidate...
The first synthesis of a non-Kekulé polynuclear aromatic, trioxy derivative triangulene, has been achieved through two-electron reduction tetrabutylammonium 4,8-dioxo-4H,8H-dibenzo[cd,mn]pyren-12-olate 14. single crystal X-ray diffraction structure this precursor shows it to be essentially planar with three-fold axis symmetry. trioxytriangulene produced when is reduced also possesses symmetry and triplet ground state. powder ESR spectrum obtained that for uniaxial system fitted using the...
High-quality Co2P nanoparticles have been obtained from diphosphine-substituted molecular cobalt clusters anchored into an inorganic matrix. The synthesis was followed stepwise using a wide panel of analytic techniques. required functionalization ordered mesoporous silica matrix the type SBA-15 achieved by covalent attachment alkoxysilyl-substituted short-bite diphosphine ligand (Ph2P)2N(CH2)3Si(OMe)3. Anchoring cluster [Co4(CO)10(μ-dppa)] (dppa = (Ph2P)2NH) led to organometallic hybrid...
Very high silica LTA-type (ITQ-29) zeolites were obtained by employing seeds, and the characteristics of synthesized materials studied. First, synthesis was performed with nanosized zeolite A crystals (Si/Al = 1.9). The use second- third-generation seeds allowed us to obtain Si/Al ratios 1500 2400, respectively.
Surfactant-Modified MFI-Zeolite Nanosheets (SMZN) were used for the first time as anion-exchangers, in case of nitrate ion removal. The SMZN material is characterized by high anionic exchange capacity and removal efficiency compared to classical SMZ prepared from clinoptilolite. easily regenerated could be probably employed remove other pollutants.