Download or read book Electrocatalyse de la r duction s lective du dioxyde de carbone sur lectrodes diffusion de gaz written by Ziad Bitar and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail de thèse s'inscrit dans le cadre de la valorisation du CO2 par voie électrochimique. Il est consacré en grande partie à l'élaboration et l'étude physico-chimique d'électrodes à diffusion de gaz (GDE), dans le but de mieux comprendre les mécanismes et les paramètres déterminants pour l'électrocatalyse de la réduction du CO2 avec ce type d'électrodes poreuses. Cette étude est articulée autour de deux axes principaux, le premier concerne des catalyseurs métalliques et le second se focalise sur des catalyseurs moléculaires.Le premier axe est relatif à la préparation, la caractérisation et l'étude électrochimique de catalyseurs de Cu, Co, In, Zn, Bi, Fe et Pb supportés sur poudre de carbone poreux. La mise en œuvre de ces catalyseurs sous forme de GDE a été étudiée, ainsi que leur activité électrocatalytique vis-à-vis la réduction du CO2. En milieu aqueux, les GDE contenant de l'indium ont permis d'obtenir les meilleurs rendements faradiques pour l'électroréduction du CO2 en acide formique. Par comparaison avec une plaque métallique d'indium, les GDE-In/C montrent des performances catalytiques améliorées et une meilleure résistance aux impuretés de l'électrolyte. Nous avons montré, qu'en phase aqueuse, l'apport de CO2 gaz en continu à travers une GDE entraînait une amélioration de l'activité du catalyseur supporté. Ceci met en évidence l'intérêt d'utiliser des métaux sous forme de particules dispersées au sein d'une GDE plutôt que des électrodes métalliques massives.Le second axe de cette étude a fait appel à trois complexes dimère de ruthénium de formule générale [Ru(L)(CH3CN)(CO)2]2(PF6)2. L'étude des propriétés redox de ces précurseurs de catalyseurs contenant des ligands L (bipyridine) diversement substitués a permis de mettre en évidence la formation de polymères à liaisons Ru-Ru par électroréduction. Le ligand portant une fonction pyrrole permet, au préalable, la formation d'un film de polypyrrole conférant au catalyseur une meilleure stabilité et de meilleures performances catalytiques. Différentes stratégies d'immobilisation de ces complexes sur carbone poreux ont été utilisées pour obtenir des GDE modifiées. Cette étude a permis de mieux comprendre l'interaction entre le catalyseur moléculaire et le support lors de la réduction du CO2. Nous avons ainsi montré que l'activité électrocatalytique du catalyseur supporté sur GDE était maintenue en milieu aqueux.Parallèlement à ce travail fondamental, un pilote de laboratoire a été développé pour effectuer la réduction électrocatalytique du CO2 en phase gaz, afin de s'affranchir de limitations rencontrées en milieu aqueux, telles que la solubilité du CO2 et la séparation des produits de la réaction. Cette étude en cours de développement a permis d'identifier certains verrous, notamment la nature de la membrane échangeuse d'ions ainsi que la nature et la proportion du polymère électrolytique entrant dans la formulation de la couche catalytique. Ce travail apporte des connaissances fondamentales et des réponses concrètes qui permettront probablement qu'un tel procédé de valorisation du CO2 puisse constituer un jour un procédé viable à l'échelle industrielle.
Download or read book Electrochemical and Electrocatalytic Reactions of Carbon Dioxide written by B.P. Sullivan and published by Elsevier. This book was released on 2012-12-02 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recycling of atmospheric molecules for use as fuels and chemicals is a goal which can only be achieved through a deeper understanding of catalytic processes, particularly electrocatalysis whereby redox transformations can be interfaced with solar or nuclear energy input. Carbon dioxide is a prototypical small molecule in many regards since it is chemically inert. In addition, because of the likely role of carbon dioxide in global temperature cycles, it will be imperative in the future to regulate the output from industrial processes. The purpose of this book is to present a unified discussion of the carbon dioxide chemistry which is necessary for the understanding and design of electrochemically-driven processes for the reduction of carbon dioxide and to provide an impetus for the further development of electrocatalytic carbon dioxide chemistry.
Download or read book Electrochemical Reduction of Carbon Dioxide written by Jinli Qiao and published by CRC Press. This book was released on 2016-07-06 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: For Researchers, Students, Industrial Professionals, and ManufacturersElectrochemical Reduction of Carbon Dioxide: Fundamentals and Technologies is your guide to improved catalytic performance in the electrochemical reduction of carbon dioxide (CO2). Written by electrochemical energy scientists actively involved in environmental research and develo
Download or read book New concepts for robust gas diffusion electrodes for the electrochemical CO reduction to CO written by Alina Gawel and published by Umsicht - Schriftenreihe. This book was released on 2023-04 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development and Investigation of Gas diffusion Electrodes for the Electrochemical Reduction of CO2 written by Dennis Kopljar and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book R duction lectrochimique Du Dioxyde de Carbone Sur Des lectrocatalyseurs Base de Cuivre written by Nihat Ege Sahin and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The anthropogenic emissions of carbon dioxide (CO2) are the major cause of global warming. The selective CO2 reduction reaction (CO2RR) of has been proposed as a promising, convenient and efficient method for sustainable energy conversion systems. The reduction of CO2 to energetically valuable products requires the use of an appropriate electrode material. This study focuses on the preparation of Cu-based electrocatalysts supported on different types of carbon materials such as Vulcan XC-72R, mesoporous carbon CMK-3, mesoporous carbon FDU-15 and tannin based mesoporous carbon IS2M for the CO2RR under mild conditions. Besides, Vulcan XC-72R carbon supported bimetallic copper/palladium alloy materials were prepared for increasing the Faradaic yield. These copper-based catalysts were electrochemically characterized and preparative electrolyses set at constant potential were carried out in order to investigate the reduction products distribution and Faradaic yields as a function of the applied potential and catalyst loading. Chemicals such as HCOOH, CO and H2 issued from the CO2RR, were determined with in-situ and ex-situ complementary (electro)analytical and spectroscopic techniques. The significant difference in the product distribution is probably due to the ensemble (geometry and ligand) effects in the bimetallic CuPd materials, and textural structure of the supporting substrates. Selective CO2 to-HCOOH conversion has been successfully undertaken on Cu50Pd50/C with 62 % Faradaic efficiency.
Download or read book Electrochemical Reduction of Carbon Dioxide on Gas Diffusion Electrodes written by Patrick Vindayer and published by . This book was released on 2013 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book REACTION DE DEPLACEMENT DU GAZ A L EAU ET REDUCTION ELECTROCATALYTIQUE DU DIOXYDE DE CARBONE written by ROMAIN.. RUPPERT and published by . This book was released on 1985 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: PREPARATION DE CATALYSEURS: COMPLEXES DE IR ET RH AVEC DES PHENANTHROLINES, POUR CATALYSE HOMOGENE. ELECTROREDUCTION PAR DES COMPLEXES MACROCYCLIQUES, EN PARTICULIER DE NI
Download or read book PEM Electrolysis for Hydrogen Production written by Dmitri Bessarabov and published by CRC Press. This book was released on 2016-02-03 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: An ever-increasing dependence on green energy has brought on a renewed interest in polymer electrolyte membrane (PEM) electrolysis as a viable solution for hydrogen production. While alkaline water electrolyzers have been used in the production of hydrogen for many years, there are certain advantages associated with PEM electrolysis and its relevan
Download or read book Natural Gas Conversion written by A. Holmen and published by Elsevier. This book was released on 1991-05-27 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings reflect the extensive fundamental and applied research efforts that are currently being made on the conversion of gas, in particular on the direct conversion of methane. The Symposium in Oslo focused on the following topics: Direct conversion of methane, Fischer-Tropsch chemistry, methanol conversion and natural gas conversion processes. The main aim was to present the state-of-the-art and progress currently being made within each of these areas. The book contains the papers presented and includes plenary lectures, short communications and posters. The papers will be of interest to scientists and engineers working in the field of gas conversion, transportation fuels, primary petrochemicals and catalysis.
Download or read book PEM Water Electrolysis written by Dmitri Bessarabov and published by Academic Press. This book was released on 2018-08-04 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: PEM Water Electrolysis, a volume in the Hydrogen Energy and Fuel Cell Primers series presents the most recent advances in the field. It brings together information that has thus far been scattered in many different sources under one single title, making it a useful reference for industry professionals, researchers and graduate students. Volumes One and Two allow readers to identify technology gaps for commercially viable PEM electrolysis systems for energy applications and examine the fundamentals of PEM electrolysis and selected research topics that are top of mind for the academic and industry community, such as gas cross-over and AST protocols. The book lays the foundation for the exploration of the current industrial trends for PEM electrolysis, such as power to gas application and a strong focus on the current trends in the application of PEM electrolysis associated with energy storage. - Presents the fundamentals and most current knowledge in proton exchange membrane water electrolyzers - Explores the technology gaps and challenges for commercial deployment of PEM water electrolysis technologies - Includes unconventional systems, such as ozone generators - Brings together information from many different sources under one single title, making it a useful reference for industry professionals, researchers and graduate students alike
Download or read book Scientific Canadian Mechanics Magazine and Patent Office Record written by Canada. Patent Office and published by . This book was released on 1966-03 with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Data Analytics in Bioinformatics written by Rabinarayan Satpathy and published by John Wiley & Sons. This book was released on 2021-01-20 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: Machine learning techniques are increasingly being used to address problems in computational biology and bioinformatics. Novel machine learning computational techniques to analyze high throughput data in the form of sequences, gene and protein expressions, pathways, and images are becoming vital for understanding diseases and future drug discovery. Machine learning techniques such as Markov models, support vector machines, neural networks, and graphical models have been successful in analyzing life science data because of their capabilities in handling randomness and uncertainty of data noise and in generalization. Machine Learning in Bioinformatics compiles recent approaches in machine learning methods and their applications in addressing contemporary problems in bioinformatics approximating classification and prediction of disease, feature selection, dimensionality reduction, gene selection and classification of microarray data and many more.
Download or read book Intelligent Data Analysis written by Deepak Gupta and published by John Wiley & Sons. This book was released on 2020-07-13 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on methods and tools for intelligent data analysis, aimed at narrowing the increasing gap between data gathering and data comprehension, and emphasis will also be given to solving of problems which result from automated data collection, such as analysis of computer-based patient records, data warehousing tools, intelligent alarming, effective and efficient monitoring, and so on. This book aims to describe the different approaches of Intelligent Data Analysis from a practical point of view: solving common life problems with data analysis tools.
Download or read book Synthetic Fuels from Coal written by I. Romey and published by Springer Science & Business Media. This book was released on 1987 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
