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Nouveaux Exemples Dutilisation De La Catalyse Heterogene Phase Gaz En Chimie Organique Fine
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Book Synopsis NOUVEAUX EXEMPLES D'UTILISATION DE LA CATALYSE HETEROGENE PHASE GAZ EN CHIMIE ORGANIQUE FINE by : FREDERIC.. VALOT
Download or read book NOUVEAUX EXEMPLES D'UTILISATION DE LA CATALYSE HETEROGENE PHASE GAZ EN CHIMIE ORGANIQUE FINE written by FREDERIC.. VALOT and published by . This book was released on 1999 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: EN CHIMIE ORGANIQUE, PARALLELEMENT A L'OBTENTION D'UN PRODUIT PUR PAR SYNTHESE SONT GENERES DES DECHETS VARIES: SOUS-PRODUITS DE REACTION, EFFLUENTS SALINS, SOLVANTS CECI EST UN DES PROBLEMES MAJEURS DE LA CHIMIE INDUSTRIELLE D'UN POINT DE VUE ECONOMIQUE ET ECOLOGIQUE, CAR IL FAUT STOCKER, VALORISER, RECYCLER, TRAITER OU DETRUIRE CES DECHETS. UN MOYEN DE MINIMISER LEUR FORMATION EST D'EFFECTUER LES REACTIONS DE SYNTHESE PAR VOIE CATALYTIQUE HETEROGENE EN PHASE GAZ, A RELATIVEMENT HAUTE TEMPERATURE ET EN L'ABSENCE DE SOLVANT. CETTE TECHNIQUE A ETE APPLIQUEE ENTRE 200 ET 350\C A L'OBTENTION SELECTIVE DE CETONES C-ALKYLEES PAR LE DIMETHYLCARBONATE ET LES ALCOOLS SUR DES CATALYSEURS DE TYPE PHOSPHATE, ET A L'OBTENTION SELECTIVE D'AMINES AROMATIQUES ET ALIPHATIQUES N-ALKYLEES PAR LES ALCOOLS SUR ALUMINE. NOUS AVONS NOTAMMENT MONTRE QU'IL EST POSSIBLE, EN CHOISISSANT LES CONDITIONS REACTIONNELLES, D'OBTENIR SELECTIVEMENT LES PRODUITS DE MONO-, DI- OU TRIMETHYLATION DE LA CYCLOPENTANONE PAR LE DIMETHYLCARBONATE SUR PHOSPHATE DE LANTHANIDE OU SUR HYDROXYAPATITE DE CALCIUM. LA METHYLATION SELECTIVE PAR LE DIMETHYLCARBONATE A ETE ETENDUE A D'AUTRES CETONES TELLES QUE LA CYCLOHEXANONE, L'ACETOPHENONE OU L'-TETRALONE. MEME S'ILS SONT MOINS REACTIFS, LE METHANOL ET LES ALCOOLS SE SONT EGALEMENT REVELES ETRE DE BONS AGENTS C-ALKYLANTS DES CETONES SUR HYDROXYAPATITE DE CALCIUM. LES ALCOOLS PRESENTENT L'AVANTAGE DE GENERER DE L'EAU COMME SEUL SOUS-PRODUIT DE LA REACTION D'ALKYLATION. LEUR UTILISATION A AINSI ETE ETENDUE A LA N-ALKYLATION DES AMINES EN PHASE GAZ, OU NOUS AVONS MONTRE QUE L'ENCOMBREMENT DE L'ALCOOL ET DE LA FONCTION AMINE JOUAIT UN ROLE SUR LA REACTIVITE DES MOLECULES ET LA SELECTIVITE DE N-ALKYLATION. ENFIN, NOUS AVONS MONTRE QUE LES AMINES CHIRALES POUVAIENT ETRE N-ALKYLEES DANS CES CONDITIONS SANS TOUCHER A LA CHIRALITE. CES RESULTATS MONTRENT QUE LA CATALYSE HETEROGENE EN PHASE GAZ EST ADAPTEE A DE NOMBREUSES TRANSFORMATIONS DE CHIMIE ORGANIQUE FINE.
Book Synopsis La Catalyse au laboratoire et dans l'industrie by : France. Institut national des sciences appliquées
Download or read book La Catalyse au laboratoire et dans l'industrie written by France. Institut national des sciences appliquées and published by . This book was released on 1967 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalyse basique hétérogène by : Maria-Isabel Rodriguez
Download or read book Catalyse basique hétérogène written by Maria-Isabel Rodriguez and published by . This book was released on 1995 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: DE NOMBREUSES REACTIONS INDUSTRIELLES SONT CONNUES POUR ETRE CATALYSEES PAR DES BASES EN PHASE HOMOGENE. DE CE FAIT, LA CATALYSE HETEROGENE PRESENTE DIFFERENTS AVANTAGES DONT LA RECUPERATION FACILE DES PRODUITS ET LA DIMINUTION DE SOUS-PRODUITS (SELS) INTERESSANTE DANS LA CHIMIE DE L'ENVIRONNEMENT. UN DES OBJECTIFS ACTUELS EST DE DEFINIR DES SOLIDES POSSEDANTS DES BASICITES VARIABLES, POUR LEUR UTILISATION EN CHIMIE ORGANIQUE FINE EN PHASE LIQUIDE, SUR DES REACTIONS D'EXIGENCE DIFFERENTE. DANS CET ESPRIT, LA BASICITE DE ZEOLITHES CSNAX ET CSNAY A PU ETRE EXALTEE PAR IMPREGNATION AVEC DIVERS TAUX D'ACETATE DE CESIUM SUIVIE D'UNE CALCINATION GENERANT DES ESPECES OXYDES EN INCLUSION. LA CARACTERISATION PHYSICO-CHIMIQUE DES SOLIDES A ETE EFFECTUEE PAR ANALYSE THERMOGRAVIMETRIQUE, DIFFRACTION DES R.X, ANALYSE VOLUMETRIQUE ET THERMODESORPTION PAR PALIERS DU CO#2. CETTE DERNIERE TECHNIQUE A PERMIS DE MONTRER QUE LE NOMBRE ET LA NATURE DES ENTITES FORMEES A L'INTERIEUR DES CAGES DES ZEOLITHES VARIENT AVEC LE TYPE X OU Y DE LA ZEOLITHE PARENT. AINSI, LES ESPECES DISPERSEES DANS LE SOLIDE X SONT DES OXYDES DE CESIUM CS#2O, TANDIS QUE DES CLUSTERS (CS#2O)#2 SONT PRESENTS DANS LA ZEOLITHE Y. L'ACTIVITE CATALYTIQUE DES ZEOLITHES MODIFIEES A ETE MESUREE SUR LA REACTION MODELE DE KNOEVENAGEL ENTRE LE BENZALDEHYDE ET LE CYANOACETATE D'ETHYLE EN PHASE LIQUIDE. LES ETUDES CINETIQUES DE LA REACTION ET LA DETERMINATION DU MECANISME, REALISEES DANS L'ETHANOL ET LE DIMETHYLSULFOXYDE ONT CLAIREMENT MIS EN EVIDENCE LE ROLE DU SOLVANT EN CATALYSE HETEROGENE. DES CORRELATIONS ACTIVITE/BASICITE REVELENT QUE LES OXYDES DE CESIUM (CS#2O) ENCAPSULES DANS LA ZEOLITHE CSNAX SONT DEUX FOIS PLUS ACTIFS QUE LES CLUSTERS (CS#2O)#2 IMPREGNES DANS LA ZEOLITHE CSNAY. ELLES MONTRENT L'INFLUENCE DE LA COMPOSITION DE LA ZEOLITHE HOTE SUR LA BASICITE DE L'OXYDE ENCAPSULE
Book Synopsis Catalyse hétérogène by : J. E. Germain
Download or read book Catalyse hétérogène written by J. E. Germain and published by . This book was released on 1959 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalyse hétérogène dans les procédés industriels by :
Download or read book Catalyse hétérogène dans les procédés industriels written by and published by Ed. Techniques Ingénieur. This book was released on with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: La catalyse hétérogène est une discipline majeure dans le monde industriel pour la production de carburants et de la plupart des composés chimiques. De par, ses caractéristiques intrinsèques, elle permet de répondre au mieux aux exigences du monde d’aujourd’hui ainsi qu’aux challenges de demain concernant notamment la nécessaire limitation des rejets polluants et l’optimisation de l’utilisation des ressources naturelles. Cet article propose au lecteur non spécialiste une visite guidée de quelques grands domaines industriels utilisant la catalyse hétérogène : raffinage, pétrochimie, dépollution automobile, chimie minérale et conversion du gaz.
Book Synopsis La cinétique des réactions en catalyse hétérogène by : Michel Boudart
Download or read book La cinétique des réactions en catalyse hétérogène written by Michel Boudart and published by Elsevier Masson. This book was released on 1982 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modélisation et spectroscopies en catalyse hétérogène by : Sylvain Cristol
Download or read book Modélisation et spectroscopies en catalyse hétérogène written by Sylvain Cristol and published by . This book was released on 2008 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: La combinaison de différente spectroscopies ln-Situ et du calcul ab-initio constitue une méthodologie particulièrement puissante pour une approche moléculaire de la catalyse hétérogène. Cette méthodologie a été mise en œuvre pour l'étude de grandes classes de catalyseurs: les sulfures supportés pour la catalyse d'hydrotraitement et les oxydes supportés pour l'oxydation sélective d'alcools. La prise en compte, pour la modélisation des états de surface, des effets de la température et des pressions partielles des constituants de la phase gazeuse environnant le catalyseur permet une définition fine de la structure de la phase active pendant la réaction catalytique. C'est à partir de ce modèle de phase active que peuvent être définis des sites catalytiques, sur lesquels l'adsorption et la réactivité des molécules sont étudiées. La spectroscopie Operando permet de valider ces modèles en étudiant le catalyseur en fonctionnement. Il a été ainsi possible d'identifier le site actif en hydrodésulfuration du thiophène et d'expliquer les différences de réactivité observées expérimentalement avec différents catalyseurs. Dans le cas des oxydes supportés, les résultats montrent clairement que le degré de polymérisation des espèces de surface est la donnée clé pour l'activité des catalyseurs.
Book Synopsis Thermodynamics and the Free Energy of Chemical Substances by : Gilbert Newton Lewis
Download or read book Thermodynamics and the Free Energy of Chemical Substances written by Gilbert Newton Lewis and published by . This book was released on 1923 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt: The scope of thermodynamics. Definitions; the concept of equilibrium. Conventions and mathematical methods. Solutions. The first law of thermodynamics and the concept of energy. The fugacity. Application of the second law to solutions. The perfect solution. The laws of the dilute solution. Systems involving variables other than pressure, temperature and composition. A useful function, called the activity, and its application to solutions. Change of activity with the temperature, and the calculation of activity from freezing points. The standard change of free energy; the equilibrium constant. Solutions of electrolytes. The activity of strong electrolytes. The activity of electrolytes from freezing point data, and tables of activity coefficients. Activity coefficient in mixed electrolytes; the principle of the ionic strength; the activity of individual ions. The galvanic cell. Single potentials; standard electrode potentials of the elements. The third law of thermodynamics. The entropy of monatomic gases and a table of atomic entropies. Introduction to systematic free energy calculations: the free energy of elementary hydrogen and metallic hydrides. Oxygen and its compouns with hydrogen and with some metals. Chlorine and its compouns. Bromine and its compounds. Iodine and its compounds. Nitrogen compounds. Carbon and some of its compounds. Compounds of carbon and nitrogen. Table of free energies; and examples illustrating its use. Conversion table for mol fractions, mol ratios and molities. Some useful numerical factors. Coefficients employed in converting activity, equilibrium constant and free energy from one temperature to another. Publications by the authrs, pertaining to thermodynamics.
Book Synopsis Frontline and Factory by : Roy MacLeod
Download or read book Frontline and Factory written by Roy MacLeod and published by Springer Science & Business Media. This book was released on 2007-05-06 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents a first considered attempt to study the factors that conditioned industrial chemistry for war in 1914-18. Taking a comparative perspective, it reflects on the experience of France, Germany, Austria, Russia, Britain, Italy and Russia, and points to significant similarities and differences. It looks at changing patterns in the organisation of industry, and at the emerging symbiosis between science, industry and the military.
Book Synopsis Sulphide Catalysts, Their Properties and Applications by : Otto Weisser
Download or read book Sulphide Catalysts, Their Properties and Applications written by Otto Weisser and published by Elsevier. This book was released on 2013-10-22 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sulphide Catalysts, Their Properties and Applications
Book Synopsis Contributions to the Data on Theoretical Metallurgy by : United States. Bureau of Mines
Download or read book Contributions to the Data on Theoretical Metallurgy written by United States. Bureau of Mines and published by . This book was released on 1937 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Analysis written by J. Gautheyrou and published by CRC Press. This book was released on 2001-01-01 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this book is to provide a better understanding of tools for soil analysis in order to use them more efficiently. It covers sampling problems as well as difficulties relating to actual analysis and quality control.
Book Synopsis Green Carbon Dioxide by : Gabriele Centi
Download or read book Green Carbon Dioxide written by Gabriele Centi and published by John Wiley & Sons. This book was released on 2014-01-17 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: PROMISING NEW APPROACHES TO RECYCLE CARBON DIOXIDE AND REDUCE EMISSIONS With this book as their guide, readers will learn a variety of new approaches and methods to recycle and reuse carbon dioxide (CO2) in order to produce green fuels and chemicals and, at the same time, minimize CO2 emissions. The authors demonstrate how to convert CO2 into a broad range of essential products by using alternative green energy sources, such as solar, wind, and hydro-power as well as sustainable energy sources. Readers will discover that CO2 can be a driving force for the sustainable future of both the chemical industry and the energy and fuels industry. Green Carbon Dioxide features a team of expert authors, offering perspectives on the latest breakthroughs in CO2 recycling from Asia, Europe, and North America. The book begins with an introduction to the production of CO2-based fuels and chemicals. Next, it covers such topics as: Transformation of CO2 to useable products through free-radical-induced reactions Hydrogenation of CO2 to liquid fuels Direct synthesis of organic carbonates from CO2 and alcohols using heterogeneous oxide catalysts Electrocatalytic reduction of CO2 in methanol medium Fuel production from photocatalytic reduction of CO2 with water using TiO2-based nanocomposites Use of CO2 in enhanced oil recovery and carbon capture and sequestration More than 1,000 references enable readers to explore individual topics in greater depth. Green Carbon Dioxide offers engineers, chemists, and managers in the chemical and energy and fuel industries a remarkable new perspective, demonstrating how CO2 can play a significant role in the development of a sustainable Earth.
Book Synopsis Glossary of Soil Science Terms 2008 by : Soil Science Society of America
Download or read book Glossary of Soil Science Terms 2008 written by Soil Science Society of America and published by ASA-CSSA-SSSA. This book was released on 2008 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: More than 1800 terms are included in this revised glossary. Subject matter includes soil physics, soil chemistry, soil biology and biochemistry, pedology, soil and water management and conservation, forest and range soils, nutrient management and soil and plant analysis, mineralogy, wetland soils, and soils and environmental quality. Two appendices on tabular information and designations for soil horizons and layers also are included.
Book Synopsis Oxidative Stress and Redox Regulation by : Ursula Jakob
Download or read book Oxidative Stress and Redox Regulation written by Ursula Jakob and published by Springer Science & Business Media. This book was released on 2013-03-15 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many physiological conditions such as host defense or aging and pathological conditions such as neurodegenerative diseases, and diabetes are associated with the accumulation of high levels of reactive oxygen species and reactive nitrogen species. This generates a condition called oxidative stress. Low levels of reactive oxygen species, however, which are continuously produced during aerobic metabolism, function as important signaling molecules, setting the metabolic pace of cells and regulating processes ranging from gene expression to apoptosis. For this book we would like to recruit the experts in the field of redox chemistry, bioinformatics and proteomics, redox signaling and oxidative stress biology to discuss how organisms achieve the appropriate redox balance, the mechanisms that lead to oxidative stress conditions and the physiological consequences that contribute to aging and disease.
Book Synopsis Flexoelectricity in Liquid Crystals by : Agnes Buka
Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Book Synopsis Cambridge Handbook of Engineering Education Research by : Aditya Johri
Download or read book Cambridge Handbook of Engineering Education Research written by Aditya Johri and published by Cambridge University Press. This book was released on 2014-02-10 with total page 1124 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Cambridge Handbook of Engineering Education Research is the critical reference source for the growing field of engineering education research, featuring the work of world luminaries writing to define and inform this emerging field. The Handbook draws extensively on contemporary research in the learning sciences, examining how technology affects learners and learning environments, and the role of social context in learning. Since a landmark issue of the Journal of Engineering Education (2005), in which senior scholars argued for a stronger theoretical and empirically driven agenda, engineering education has quickly emerged as a research-driven field increasing in both theoretical and empirical work drawing on many social science disciplines, disciplinary engineering knowledge, and computing. The Handbook is based on the research agenda from a series of interdisciplinary colloquia funded by the US National Science Foundation and published in the Journal of Engineering Education in October 2006.
