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Ce travail est divisé en deux parties. La première partie commence par une recherche bibliographique sur les mécanismes de formation de γ-Al2O3 poreuse par précipitation sol-gel en voie aqueuse. Le comportement de catalyseurs Ni-Me (Me = Mo, Mn, Fe, Co, Cu) supportés sur γ-Al2O3 est ensuite étudié. Il est montré que l’ajout de platine permet d’augmenter la réductibilité des oxydes métalliques formés lors de la synthèse de ces catalyseurs et de diminuer la taille des nanoparticules métalliques obtenues après réduction. La fonctionnalisation du support par un groupement ligand permet de favoriser initialement la formation d’aluminates (spinelles) mais augmente leur réductibilité. La structuration du support par l’utilisation d’un surfactant (acide stéarique) n’a pas réussi mais a néanmoins permis d’augmenter la surface spécifique et de réduire le frittage des nanoparticules métalliques supportées par augmentation de la microporosité. La deuxième partie consiste en des essais de dépôt d’un catalyseur Ni-Al2O3 sous forme de couche sur des monolithes par trempage. De nombreux défauts sont observés (zones sans couche, fracturation, agrégats) qui sont partiellement résolus par des modifications appropriés de la procédure expérimentale et des solutions de dépôt.

alumine --- nickel --- catalyseur supporté --- monolithe --- coating --- EDAS --- supported catalyst --- alumina --- nickel --- EDAS --- monolith --- coating --- Ingénierie, informatique & technologie > Ingénierie chimique --- Ingénierie, informatique & technologie > Science des matériaux & ingénierie

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This Special Issue deals with the fascinating material class of nanocomposites consisting of extremely small particles (nanoparticles) which are embedded in polymers. Such materials are of paramount interest in various disciplines, especially chemistry, physics, biomedicine and materials science. Due to the diversity of the components of nanocomposites, they provide a broad spectrum of material properties and applications. The versatility of nanocomposites is indeed reflected by the research covered in this Special Issue. The field of nanocomposites includes innovative science and a source of inspiration for currently relevant economic topics as well as for envisaged technologies of the future. Indeed, this volume alludes to strategies for the preparation of nanocomposites and possibilities for a variety of applications, such as catalytic reactions, gas barriers, high refractive index materials, corrosion protection, electromagnetic inference (EMI) shielding, lithium ion batteries, tissue engineering and plastic surgery.

Research & information: general --- broadband dielectric spectroscopy --- dielectric strength --- loss factor --- magnesium oxide --- nanocomposite --- relative permittivity --- surface functionalization --- voltage response --- lithium-ion battery --- ionic-liquid-based separator --- hot-pressing --- inorganic nanoparticle --- fractal cluster --- nanostructures --- polymer matrix composites (PMCs) --- mechanical properties --- thermal properties --- elastomeric foam --- plastic reconstruction --- hydroxyapatite/polyurethane --- nanosized dispersion --- viscoelasticity --- biocompatibility --- nanoreactor --- catalyst confinement --- Flash Nanoprecipitation --- diffusion --- poly(vinyl alcohol) --- nanofiller --- film --- catalytic durability --- nanoparticle --- supported catalyst --- radical reactions --- platinum (Pt) --- H2O2 decomposition --- contact lens cleaning --- polymer brushes --- nanoparticles --- SPION --- thin magnetic films --- ATRP --- hybrid polymer/inorganic composites --- titanium oxide --- hybrid material --- anatase --- organic-inorganic hybrid --- high refractive index material --- MXene --- oxidized carbon nanotube (CNTO) --- nanoparticle decoration --- functionalization --- electromagnetic interference (EMI) shielding --- anti-corrosion --- tin sulfide (SnS) --- molybdenum disulfide (MoS2) --- electrochemical test --- composite coating --- nanocomposites --- surface-functionalization --- secondary dispersion --- hot-stretching --- metal–polymer interface --- multilayer --- structure–function correlation --- indirect band gap --- GISAXS --- GIWAXS --- UV-Vis

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In this book, the performance of homogeneous and heterogeneous catalysts applied in biomass processing was assessed, paying special attention to the main advantages and challenges related to their use. Indeed, these challenges are opportunities to develop new research lines that could be fruitful in the near future. Thus, different studies are included, dealing with diverse subjects, with one main goal in common: the improvement of different aspects related to biomass processing through the use of catalysts.

nanospheroids --- zinc-doped CaO --- natural triglycerides --- aminolysis --- heterogeneous catalyst --- recyclability --- catalyst --- sodium hydroxide --- fatty acid methyl ester --- central composite rotatable design --- operational conditions --- aerated irrigation --- soil enzyme activity --- soil microbial biomass --- soil respiration --- bio-derived phenol --- Ni-Cu-Co/Al2O3 --- in-situ hydrodeoxygenation --- cyclohexane --- hydrogenolysis --- biomass --- 5-hydroxymethylfurfural --- 2,5-furandicrboxylic acid --- aerobic oxidation --- metal catalysts --- acid catalysis --- biodiesel --- biofuel --- esterification --- fatty acid --- methanolysis --- molybdenum oxide --- transesterification --- vegetable oil --- fatty acid methyl esters --- 2-ethyl-1-hexanol --- 1-heptanol --- 4-methyl-2-pentanol --- viscosity --- flash and combustion points --- methyl oleate --- methyl ricinoleate --- cellulase --- cellulose --- paper sludge --- Saccharomyces cerevisiae --- synergism --- furfural --- carbon-supported catalyst --- xylose conversion --- iron --- heterogeneous catalysts --- thermoset polymer --- epoxy --- cellulose nanofiber --- curing characteristics --- thermal properties --- mechanical properties --- RSM --- numerical optimization --- keratinase --- feather --- Bacillus sp. --- amino acids --- n/a

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In this book, the performance of homogeneous and heterogeneous catalysts applied in biomass processing was assessed, paying special attention to the main advantages and challenges related to their use. Indeed, these challenges are opportunities to develop new research lines that could be fruitful in the near future. Thus, different studies are included, dealing with diverse subjects, with one main goal in common: the improvement of different aspects related to biomass processing through the use of catalysts.

Research & information: general --- nanospheroids --- zinc-doped CaO --- natural triglycerides --- aminolysis --- heterogeneous catalyst --- recyclability --- catalyst --- sodium hydroxide --- fatty acid methyl ester --- central composite rotatable design --- operational conditions --- aerated irrigation --- soil enzyme activity --- soil microbial biomass --- soil respiration --- bio-derived phenol --- Ni-Cu-Co/Al2O3 --- in-situ hydrodeoxygenation --- cyclohexane --- hydrogenolysis --- biomass --- 5-hydroxymethylfurfural --- 2,5-furandicrboxylic acid --- aerobic oxidation --- metal catalysts --- acid catalysis --- biodiesel --- biofuel --- esterification --- fatty acid --- methanolysis --- molybdenum oxide --- transesterification --- vegetable oil --- fatty acid methyl esters --- 2-ethyl-1-hexanol --- 1-heptanol --- 4-methyl-2-pentanol --- viscosity --- flash and combustion points --- methyl oleate --- methyl ricinoleate --- cellulase --- cellulose --- paper sludge --- Saccharomyces cerevisiae --- synergism --- furfural --- carbon-supported catalyst --- xylose conversion --- iron --- heterogeneous catalysts --- thermoset polymer --- epoxy --- cellulose nanofiber --- curing characteristics --- thermal properties --- mechanical properties --- RSM --- numerical optimization --- keratinase --- feather --- Bacillus sp. --- amino acids --- nanospheroids --- zinc-doped CaO --- natural triglycerides --- aminolysis --- heterogeneous catalyst --- recyclability --- catalyst --- sodium hydroxide --- fatty acid methyl ester --- central composite rotatable design --- operational conditions --- aerated irrigation --- soil enzyme activity --- soil microbial biomass --- soil respiration --- bio-derived phenol --- Ni-Cu-Co/Al2O3 --- in-situ hydrodeoxygenation --- cyclohexane --- hydrogenolysis --- biomass --- 5-hydroxymethylfurfural --- 2,5-furandicrboxylic acid --- aerobic oxidation --- metal catalysts --- acid catalysis --- biodiesel --- biofuel --- esterification --- fatty acid --- methanolysis --- molybdenum oxide --- transesterification --- vegetable oil --- fatty acid methyl esters --- 2-ethyl-1-hexanol --- 1-heptanol --- 4-methyl-2-pentanol --- viscosity --- flash and combustion points --- methyl oleate --- methyl ricinoleate --- cellulase --- cellulose --- paper sludge --- Saccharomyces cerevisiae --- synergism --- furfural --- carbon-supported catalyst --- xylose conversion --- iron --- heterogeneous catalysts --- thermoset polymer --- epoxy --- cellulose nanofiber --- curing characteristics --- thermal properties --- mechanical properties --- RSM --- numerical optimization --- keratinase --- feather --- Bacillus sp. --- amino acids