A5043440547- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Catalysis and Hydrodesulfurization Studies
- Catalysis for Biomass Conversion
- Mesoporous Materials and Catalysis
- Catalysts for Methane Reforming
- Polyoxometalates: Synthesis and Applications
- Electrocatalysts for Energy Conversion
- Zeolite Catalysis and Synthesis
- Gas Sensing Nanomaterials and Sensors
- Nanomaterials for catalytic reactions
- Transition Metal Oxide Nanomaterials
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Enzyme Catalysis and Immobilization
- Radioactive element chemistry and processing
- Electronic and Structural Properties of Oxides
- Spectroscopy and Quantum Chemical Studies
- Chemical Synthesis and Reactions
- MXene and MAX Phase Materials
- Machine Learning in Materials Science
- Chemical Synthesis and Characterization
- Solid-state spectroscopy and crystallography
- Industrial Gas Emission Control
- Metal and Thin Film Mechanics
Institut de Recherches sur la Catalyse et l'Environnement de Lyon
2016-2025
Université Claude Bernard Lyon 1
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Catalyse
2015-2024
Forum Réfugiés - Cosi
2015-2020
Lyon College
2018
Indian Institute of Chemical Technology
2005-2007
Ruhr University Bochum
2007
IFP Énergies nouvelles
2006
Institut Français
2006
Abstract A dynamic structural behavior of Pt nanoparticles on the ceria surface under reducing/oxidizing conditions was found at moderate temperatures (<500 °C) and exploited to enhance catalytic activity Pt/CeO 2 ‐based exhaust gas catalysts. Redispersion platinum in an oxidizing atmosphere already occurred 400 °C. protocol with reducing pulses 250–400 °C applied a subsequent step for controlled Pt‐particle formation. Operando X‐ray absorption spectroscopy unraveled different extent...
Structural characteristics of ceria−titania and vanadia/ceria−titania mixed oxides have been investigated using X-ray powder diffraction (XRD), Raman spectroscopy (RS), photoelectron (XPS) techniques. The (1:1 mole ratio) oxide was obtained by a coprecipitation method, nominal 5 wt % V2O5 deposited over its surface wet impregnation technique. Both the materials were then subjected to thermal treatments from 773 1073 K characterized above-mentioned XRD results suggest that CeO2−TiO2 calcined...
Structural characteristics of nanosized ceria-silica, ceria-titania, and ceria-zirconia mixed oxide catalysts have been investigated using X-ray diffraction (XRD), Raman spectroscopy, BET surface area, thermogravimetry, high-resolution transmission electron microscopy (HREM). The effect support oxides on the crystal modification ceria cubic lattice was mainly focused. were obtained by soft chemical routes with ultrahighly dilute solutions subjected to thermal treatments from 773 1073 K. XRD...
Microstructure evolution of ceria-based mixed oxides CeO2−MO2 (M = Si4+, Ti4+, and Zr4+) after thermal treatments in the temperature range 773−1073 K were investigated by X-ray diffraction (XRD), Raman spectroscopy, photoelectron spectroscopy (XPS), other techniques. The CeO2−SiO2 was synthesized a deposition precipitation method, coprecipitation procedure adopted to make CeO2−TiO2 CeO2−ZrO2 binary oxides. XRD measurements revealed presence crystalline cubic CeO2 on surface SiO2 CeO2−SiO2,...
X-ray diffraction, Raman, and photoelectron spectroscopy were utilized to characterize CeO2/SiO2 supports V2O5/CeO2/SiO2 catalysts calcined at different temperatures from 773 1073 K. The support was obtained by an aqueous deposition precipitation method, vanadium oxide applied the (773 K) using a wet impregnation technique. XRD Raman results suggest that carrier is thermally quite stable up K calcination temperature primarily consists of CeO2 overlayer on SiO2 substrate. also accommodates...
The evolution and physicochemical characteristics of CeO2−ZrO2 V2O5/CeO2−ZrO2 samples under the influence thermal treatments from 773 to 1073 K were investigated using X-ray diffraction (XRD), BET surface area, Raman spectroscopy, photoelectron spectroscopy (XPS). mixed oxide was synthesized by a coprecipitation method, nominal 12 wt % V2O5 deposited over calcined support (773 K) wet impregnation technique. powder analysis suggests formation Ce0.75Zr0.25O2 cubic phase at K. With increasing...
Catalytic oxidation of CO over CexHf1 - xO2 (CH; 8:2 mole ratio) and CexZr1 (CZ; 1:1 nanocomposite oxides reveals that the former combination exhibits more conversion at much lower temperature than latter. Thermal textural stability both combinations, obtained by a coprecipitation method calcined 773 1073 K, were examined X-ray diffraction, Raman spectroscopy, CO-temperature programmed reduction techniques. The XRD results disclose formation stable Ce0.8Hf0.2O2 cubic phase in case CH sample,...
Raman spectroscopy is a powerful technique for detecting peroxo (O 2 ) 2– and superoxo – species adsorbed on defect sites of ceria. These are probed by reducing CeO at high temperature then chemisorbing oxygen low temperature. In the present study, it shown first time that such characterization has to be achieved very laser power avoid formation photolysis analyze only chemisorbed species. Respecting this requirement, formed 0.7% Pt/CeO compound, support used prepare were compared after...
Irregularly shaped and inorganic fullerene-like MoS2 compounds were characterized by Resonance Raman spectroscopy using an exciting line at 633 nm. It was shown that the relative intensity of longitudinal acoustic mode 226 cm−1 its overtone strongly depends on crystallite size but not particles made agglomerated crystallites. This technique appeared as a promising probe to characterize in situ very small crystallites are observed XRD.
The influence of the noble metal-support interaction on performance, activation behavior and stability Pd/CeO2 catalysts for total methane oxidation was systematically investigated. A series samples with 1–3 wt% Pd loading supported CeO2 surface areas varying between 30 120 m2/g were tested as-prepared after different reductive treatments. Distinct structural states identified, which catalytic performance depending pre-treatment theoretical monolayer coverage CeO2. Although treatments...
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Low-temperature redispersion leads to an intermediate Pt monolayer arrangement, very active for CO oxidation.
The hydrogenolysis of tetrahydrofurfuryl alcohol was studied in aqueous phase over a range bifunctional catalysts based on Rh and an oxophilic promoter (Re, W, Mo) supported ZrO2. structures the were characterised employing powder XRD, Raman spectroscopy TEM analysis. degrees reduction evaluated by H2-TPR XPS analyses. metallic properties assessed CO chemisorption. For first time, acidic calorimetric measurements 2-phenyl-ethylamine adsorption heat. combination sites Brønsted (linked to...
Solution combustion generates mesoporous ceria with strongly anchored Ir nanoparticles, which are efficient methane reforming catalysts.