Download or read book Understanding Hydrodenitrogenation on Unsupported and Supported Sulfide Based Catalysts written by Ana Hrabar and published by . This book was released on 2011 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrotreating Catalysts written by R.G. Anthony and published by Elsevier. This book was released on 1989-08-28 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides much information of interest to anyone working in the petroleum industry or studying catalyst preparation and characterization in industrial or university laboratories. It contains both review articles and papers reporting progress concerning hydrotreating catalysts which together provide an up-to-date picture of this interesting field. The use of modern spectroscopic techniques in catalyst characterization is described and new concepts such as microbial upgrading and the use of crystallography data in catalyst design are presented.
Download or read book Unsupported Transition Metal Sulfide Catalysts for Deep Hydrodesulfurization of Hydrocarbon Fuels written by and published by . This book was released on 2007 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The requirement of clean fuels has resulted in a continuing worldwide effort to dramatically reduce the sulfur levels. This is driving the need for more active hydrodesulfurization (HDS) catalysts. The purpose of this research is to study the potential of unsupported Mo based sulfide catalysts prepared from hydrothermal method. The unsupported catalysts exhibited the excellent activity for the simultaneous HDS of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). Activity and surface area of catalysts depend strongly upon the preparation temperature and pressure. Organic solvent added in catalyst preparation helps to improve the dispersion of the precursor molecules. The unpromoted and promoted (Co or Ni) Mo sulfide catalysts have different properties and activity. Addition of promoter decreased surface area and pore volume. TPR analysis suggested that promoter decrease metal sulfur bond strength. HRTEM and XRD results showed that the growth of catalyst particle was suppressed when promoter was added. The promoter increased HDS activity of MoS[subscript 2] and changed the contribution of the direct-desulfurization and of hydrogenation pathways. The main effect of the promoter was to increase the rate of C-S bond cleavage. The liquid-phase adsorption of DBT and 4,6-DMDBT was used to study the adsorption capacity and mechanism over the synthesized catalysts. The results showed that the promoters not only increase active site number, but also enhance activity of active sites of the Mo sulfide.
Download or read book Comparataive Studies of Hydrodenitrogenation by Mixed Metal Sulfide Catalysts written by Mary Margaret Luchsinger and published by . This book was released on 1990 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrodesulfurization and Hydrodenitrogenation of Model Compounds Using In situ Hydrogen Over Nano Dispersed Mo Sulfide Based Catalysts written by Kun Liu and published by . This book was released on 2010 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heavy oil derived from oil sands is becoming an important resource of energy and transportation fuels due to the depletion of conventional oil resources. However, bitumen and heavy oils have a low hydrogen/carbon ratio and contain a large percentage of sulfur and nitrogen heterocyclic compounds. At the level of deep desulfurization, aromatic poly-nuclear molecules, especially nitrogen-containing heterocyclic compounds, exhibit strong inhibitive effect on hydrodesulfurization (HDS) due to competitive adsorption on catalytically active sites with sulfur-containing molecules. Therefore, it is necessary to study the HDS of refractory sulfur-containing compounds and also the effect of nitrogen-containing species on the deep HDS for achieving the ultra low sulfur specifications for transportation fuels. Additionally, the cost of H2 increased in recent years and a bitumen emulsion upgrading technique using an alternative in-situ H2 generated via the water gas shift (WGS) reaction during the hydro-treating was developed in our group.
Download or read book Synthesis of Solid Catalysts written by Krijn P. de Jong and published by John Wiley & Sons. This book was released on 2009-06-22 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: This practical book combines recent progress with a discussion of the general aspects of catalyst preparation. The first part deals with the basic principles of solid catalyst preparation, explaining the main aspects of sol-gel chemistry and interfacial chemistry, followed by such techniques as co-precipitation and immobilization. New tools for catalyst preparation research, including microspectroscopy and high-throughput experimentation, are also taken into account. The second part heightens the practical relevance by providing six case studies on such topics as the preparation of zeolites, hydrotreating catalysts, methanol catalysts and gold catalysts
Download or read book Transition Metal Sulphides written by Th. Weber and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrotreating catalysis with transition metal sulphides is one of the most important areas of industrial heterogeneous catalysis. The present book deals with the chemical and catalytic aspects of transition metal sulphides, focusing on their use in hydrotreating catalysis. The book¿s 12 chapters present reviews of solid-state, coordination and organometallic chemistry, surface science and spectroscopic studies, quantum chemical calculations, catalytic studies with model and real catalysts, as well as refinery processes. A presentation of state-of-the-art background to pertinent work in the field. Can be used as an introduction to the chemical and catalytic properties of transition metal sulphides as well as an advanced level reference.
Download or read book Hydrodesulfurization and Hydrodenitrogenation written by Toshiaki Kabe and published by Wiley-VCH. This book was released on 2000-04-13 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of efficient catalysts for hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) processes is an essential and urgent research field. During oil refinement the removal of sulfur and nitrogen compounds from petroleum feedstock is crucial, as the emission of sulfur and nitrogen oxides into the atmosphere causes severe environmental problems. In light of the industrial process for hydrocarbons, HDS is indispensable as it eliminates the poisoning of catalysts during hydrotreatment and hydrocracking. In order to develop new catalysts, the mechanism of these reactions as well as the structures and functions of the catalysts need to be elucidated. This book provides an up-to-date and deep insight, which spans kinetic studies, catalytic cycles, structures and properties of catalysts to process engineering. Therefore every chemist and engineer working in this important research field will welcome this valuable source of information.
Download or read book New Frontiers in Nanochemistry Concepts Theories and Trends written by Mihai V. Putz and published by CRC Press. This book was released on 2020-05-06 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: New Frontiers in Nanochemistry: Concepts, Theories, and Trends, Volume 2: Topological Nanochemistry is the second of the new three-volume set that explains and explores the important basic and advanced modern concepts in multidisciplinary chemistry. Under the broad expertise of the editor, this second volume explores the rich research areas of nanochemistry with a specific focus on the design and control of nanotechnology by structural and reactive topology. The objective of this particular volume is to emphasize the application of nanochemistry. With 46 entries from eminent international scientists and scholars, the content in this volume spans concepts from A-to-Z—from entries on the atom-bond connectivity index to the Zagreb indices, from connectivity to vapor phase epitaxy, and from fullerenes to topological reactivity—and much more. The definitions within the text are accompanied by brief but comprehensive explicative essays as well as figures, tables, etc., providing a holistic understanding of the concepts presented.
Download or read book Catalysis at Surfaces written by Wolfgang Grünert and published by Walter de Gruyter GmbH & Co KG. This book was released on 2023-07-24 with total page 937 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysis is at the heart of the chemical industry, which uses solid catalysts for the large-scale production of commodity chemicals. Catalysis at surfaces is also the basis for the ongoing transition to a sustainable energy supply, which requires molecules such as hydrogen, ammonia or methanol to store energy in chemical bonds, and environmental protection equally relies on heterogeneous catalysis. Catalysis at surfaces is a truly interdisciplinary field, which requires profound knowledge from chemistry, physics and engineering as provided by this textbook. All essential tools are described ranging from the synthesis and modification of porous solids over bulk- and surface-sensitive characterization techniques to currently applied theoretical methods. A close-up to the important aspects of surface catalysis is provided, which comprises the established knowledge about mechanisms and active sites, promotors and poisons in redox and acid-base catalysis. This advanced textbook is recommended for Master and PhD students, for whom it provides the fundamentals and all relevant aspects of catalyst synthesis, characterization and application in suitable reactors. It is not only thermal catalysis that is covered in depth, but also photo- and electrocatalysis as emerging fields in the Energiewende.
Download or read book Advances in Catalysis written by and published by Elsevier. This book was released on 2001-09-12 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1948, Advances in Catalysis has filled the gap between the papers that report on and the textbooks that teach in the diverse areas of catalysis research. The editors of and contributors to Advances in Catalysis are dedicated to recording progress in this area. Advances in Catalysis, Volume 46 builds foundations of fundamental understanding at the atomic and molecular scales in support of technologically important catalytic processes. The first tow chapters forge links between molecular (homogeneous) catalysis and catalysis occurring analogously-and sometimes more successfully-on surfaces. The following three chapters are concerned with advances in classical surface catlysis building on concepts of reaction kinetics and surface characterization.
Download or read book Heterogeneous Catalytic Materials written by Guido Busca and published by Newnes. This book was released on 2014-05-23 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterogeneous Catalytic Materials discusses experimental methods and the latest developments in three areas of research: heterogeneous catalysis; surface chemistry; and the chemistry of catalysts. Catalytic materials are those solids that allow the chemical reaction to occur efficiently and cost-effectively. This book provides you with all necessary information to synthesize, characterize, and relate the properties of a catalyst to its behavior, enabling you to select the appropriate catalyst for the process and reactor system. Oxides (used both as catalysts and as supports for catalysts), mixed and complex oxides and salts, halides, sulfides, carbides, and unsupported and supported metals are all considered. The book encompasses applications in industrial chemistry, refinery, petrochemistry, biomass conversion, energy production, and environmental protection technologies. Provides a systematic and clear approach of the synthesis, solid state chemistry and surface chemistry of all solid state catalysts Covers widely used instrumental techniques for catalyst characterization, such as x-ray photoelectron spectroscopy, scanning electron microscopy, and more Includes characterization methods and lists all catalytic behavior of the solid state catalysts Discusses new developments in nanocatalysts and their advantages over conventional catalysts
Download or read book Molten Salt Chemistry and Technology written by M. Chemla and published by . This book was released on 1991 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: This state-of-the-art volume presents the new developments in fundamental research and in industrial applications of Molten Salts. Special attention is placed on recent developments of special topics such as Electrodeposition of Refractory Metals (Niobium, Molybdenum), and Organic Chemistry and Electrochemistry in Molten Salts.
Download or read book Fossil Energy Update written by and published by . This book was released on 1984 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oil Gas Science and Technology written by and published by . This book was released on 2006 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrodesulfurization Catalysis and Mechanism of Supported Transition Metal Sulfides written by Emiel Jan Maria Hensen and published by . This book was released on 2000 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrotreating Technology for Pollution Control written by Mario L. Occelli and published by CRC Press. This book was released on 1996-08-06 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Based on the American Chemical Society's Second Symposium on Advances in Hydrotreating Catalysts, held in Washington, D.C. Offers comprehensive coverage of the most recent progress in catalysis by transition metal sulfides for the creation of more environmentally safe catalysts and processes. Written by over 70 acclaimed experts from various fields."
