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Oxydation Totale Du Chlorobenzene Sur Des Catalyseurs A Base De Perovskites
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Book Synopsis Oxydation totale du chlorobenzène sur des catalyseurs à base de pérovskites by : Amal Elhachimi
Download or read book Oxydation totale du chlorobenzène sur des catalyseurs à base de pérovskites written by Amal Elhachimi and published by . This book was released on 2005 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les Composés Organiques Volatils Chlorés (COVC) présentent un sérieux problème pour l'environnement, ils sont en partie responsables de l'effet de serre et de la destruction de la couche d'ozone. L'oxydation catalytique est une méthode alternative de destruction des COVC à l'incinération thermique pour des effluents peu chargés en COV. Actuellement il n'existe pas de catalyseurs performants pour ce type de réaction. Cette étude vise en la mise au point de nouvelles formulations M/LaBO3 pour l'oxydation totale du chlorobenzène en CO2, H2O et HCl (M = Pd, Pt; B = Fe, Mn, Co, Ni). L'idée de base est d'associer un métal noble reconnu comme bon catalyseur d'oxydation à un support de type pérovskite LaBO3 qui permet d'obtenir des stoechiométries excédentaires et déficitaires en oxygène. La vitesse de rotation la plus importante est obtenue pour le catalyseur dont la dispersion en Pd est la plus faible (Pd/LaCoO3). La réaction de chloration de PhCl a été étudiée en détail. Une étude SPX du processus global (pré-calcination, pré-réduction, test catalytique) combinée aux résultats catalytiques a permis de proposer un schéma cinétique sur de tels catalyseurs.
Book Synopsis Oxydation totale du chlorobenzène et du trichloroéthylène sur catalyseurs à base de palladium déposé sur supports oxyde by : Thanh Binh Nguyen
Download or read book Oxydation totale du chlorobenzène et du trichloroéthylène sur catalyseurs à base de palladium déposé sur supports oxyde written by Thanh Binh Nguyen and published by . This book was released on 2006 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'émission des composés organiques volatils chlorés, souvent utilisés comme solvant dans de nombreux processus industriels, cause de sérieux problèmes environnementaux et de santé humaine. Plusieurs techniques permettent une diminution de ces émissions. Parmi ces différentes techniques, l'oxydation catalytique se révèle être une voie prometteuse. Les catalyseurs étudiés pour ces réactions sont généralement divisés en deux groupes distincts : les métaux nobles (Pt, Pd) supportés et les oxydes (ou oxydes mixtes). Le but du travail de thèse était d'étudier des catalyseurs originaux préparés par dispersion de palladium sur différents oxydes méso-macroporeux (TiO2, ZrO2, TiO2-ZrO2). Ces nouveaux oxydes, méso-macroporeux, possèdent des propriétés texturales améliorées comparées à celles obtenues pour les oxydes classiques. Les résultats obtenus pour ces catalyseurs originaux ont été comparés aux résultats obtenus sur des catalyseurs de référence (préparés par imprégnation de palladium sur supports commerciaux), ainsi que sur des catalyseurs oxydes mixtes de type pérovskite LaBO3 (B: Mn, Co, Fe). Il s'avère que les oxydes mixtes présentent une activité intéressante vis-à-vis de la réaction d'oxydation totale des COVCls, mais surtout une stabilité en réaction nettement améliorée comparée à celle obtenue sur les oxydes simples. Deux molécules, le chlorobenzène et le trichloroéthylène, ont été choisies comme molécules modèles pour les mesures d'activité catalytique. Les méthodes de caractérisation stmcturales (DRX, IR-FT, RAMAN, SPX,.) et texturales (isothermes d'adsorption-désorption d'azote, MEB. MET,) ont été utilisés pour élucider les rôles de la phase active et du support sur l'activité du catalyseur
Book Synopsis Pillared Clays and Related Catalysts by : Antonio Gil
Download or read book Pillared Clays and Related Catalysts written by Antonio Gil and published by Springer Science & Business Media. This book was released on 2010-08-28 with total page 531 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the first works introducing the aluminum intercalated clay family in the early 1970s, interest in the synthesis of pillared interlayered clays has increased tremendously, especially research into the properties and applications of new synthesis methods. The need for solids that could be used as cracking catalysts with larger pores than zeolitic materials has spurred the synthesis of new porous materials from clays. Pillared Clays and Related Catalysts reviews the properties and applications of pillared clays and other layered materials used as catalysts, focusing on: the acidity of pillared clays and the effect it has on catalytic performance the use of pillared clays as supports for catalytically active phases, and the use of the resulting solids in environmentally friendly reactions the applications of the selective reduction of NOx the comparison between the reactions of pillared clays and anionic clays.
Book Synopsis Materials Syntheses by : Ulrich Schubert
Download or read book Materials Syntheses written by Ulrich Schubert and published by Springer Science & Business Media. This book was released on 2008-11-23 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials syntheses are more complex than syntheses of inorganic or organic compounds. Materials synthesis protocols often suffer from unclarities, irreproducibility, lack in detail and lack in standards. The need to change this situation is the main motivation for this book. It collects a number of detailed protocols, ranging from organic polymers to carbonaceous and ceramic materials, from gels to porous and layered materials and from powders and nanoparticles to films.
Book Synopsis Sol-Gel Materials by : John D. Wright
Download or read book Sol-Gel Materials written by John D. Wright and published by CRC Press. This book was released on 2018-10-03 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sol-Gel processing methods, first used historically for decorative and constructional materials, were extensively developed in the last century for applications such as glasses, ceramics, catalysts, coatings, composites and fibres. Today they are reaching their full potential, enabling the preparation of new generations of advanced materials not easily accessible by other methods yet using mild, low-energy conditions. The topic is therefore increasingly included in advanced undergraduate, MSc and PhD programmes in the areas of chemistry, physics and materials science. This concise introductory text, written at the advanced undergraduate/first-year postgraduate level, is also suitable as an introduction to the development, mechanisms, chemistry, characterisation methods and applications of the technique. It provides readers with an extensive yet concise grounding in the theory of each area of the subject and details the real and potential applications and the future prospects of sol-gel chemistry.
Book Synopsis Recent Developments in Polymer Macro, Micro and Nano Blends by : P.M. Visakh
Download or read book Recent Developments in Polymer Macro, Micro and Nano Blends written by P.M. Visakh and published by Woodhead Publishing. This book was released on 2016-08-24 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent Developments in Polymer Macro, Micro and Nano Blends: Preparation and Characterisation discusses the various types of techniques that are currently used for the characterization of polymer-based macro, micro, and nano blends. It summarizes recent technical research accomplishments, emphasizing a broad range of characterization methods. In addition, the book discusses preparation methods and applications for various types of polymer-based macro, micro, and nano blends. Chapters include thermoplastic-based polymer & nano blends, applications of rubber based and thermoplastic blends, micro/nanostructures polymer blends containing block copolymers, advances in polymer-inorganic hybrids as membrane materials, synthesis of polymer/inorganic hybrids through heterophase polymerizations, nanoporous polymer foams from nanostructured polymer blends, and natural polymeric biodegradable nano blends for protein delivery. Describes the techniques pertaining to a kind (or small number) of blends, showing specific examples of their applications Covers micro, macro, and nano polymer blends Contains contributions from leading experts in the field
Book Synopsis High Temperature Superconductivity 2 by : Anant V. Narlikar
Download or read book High Temperature Superconductivity 2 written by Anant V. Narlikar and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: In contrast to research on the fundamental mechanisms of High-Temperature Superconductivity, in recent years we have seen enormous developments in the fabrication and application of High-Tc-superconductors. The two volumes of High Temperature Superconductivity provide a survey of the state of the technology and engineering applications of these materials. They comprise extended original research papers and technical review articles written by physicists, chemists, materials scientists and engineers, all of them noted experts in their fields. The interdisciplinary and strictly application-oriented coverage should benefit graduate students and academic researchers in the mentioned areas as well as industrial experts. Volume 1 "Materials" focuses on major technical advancements in High-Tc materials processing for applications. Volume 2 "Engineering Applications" covers numerous application areas where High-Tc superconductors are making tremendous impact.
