Download or read book Surface Structure and Reactivity of Platinum in the Oxidation of Ammonia written by Yingfeng Zeng and published by . This book was released on 2008 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AMMONIA ELECTRO OXIDATION MECHANSIM ON THE PLATINUM 100 SURFACE written by Spencer Wallace and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The catalytic electrochemical oxidation of ammonia is a structure-sensitive reaction that will potentially play a role in future energy systems, including portable fuel cells and the elimination of harmful pollutants. Platinum is an ideal catalyst for this reaction because of its selectivity toward the formation of nitrogen gas. The Pt (100) facet shows much faster ammonia electroxidation than other facets of Pt, however the elementary reaction steps responsible for this phenomenon are not understood. Density functional theory (DFT) calculations are used to determine elementary reaction thermodynamics and kinetics. Absorbed NH2* formation is rapid and this intermediate is very stable on Pt (100). High coverage NH2* binds at atop sites, enabling favorable N-N bond formation. The faster rate of ammonia oxidation on Pt (100) results from the low barrier of N2H4* formation resulting from NH2* dimerization at high coverage. Understanding the reactivity of ammonia oxidation of Pt (100) can aid in electrochemical reaction mechanism development and catalyst design.
Download or read book Surface Morphology of Platinum Catalysts and Oscillations in Ammonia Oxidation on Platinum written by Maria Flytzani-Stephanopoulos and published by . This book was released on 1978 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Surface Structure on the Decomposition of Nitric Oxide and Ammonia on Platinum written by John Michael Gohndrone and published by . This book was released on 1987 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Introduction to Surface Physical Chemistry written by K. Christmann and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Construction and Reactivity of Pt Based Bi component Catalytic Systems written by Rentao Mu and published by Springer. This book was released on 2017-06-20 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, the author outlines the construction of active structure and modulation of catalytic reactivity of Pt-based bi-component catalysts, from the model systems to real supported catalysts. The thesis investigates the promotion effect of the second components on catalytic performance of Pt catalysts, and presents the reversible generation of the “sandwich-like” structure of Pt-Ni catalysts, containing both surface NiO1-X and subsurface Ni by alternating redox treatments at medium temperature. With the aid of single layer graphene, the dynamic process of chemical reactions occurring on the Pt(111) surface can be visualized using in-situ LEEM and DUV-PEEM techniques, the results of which are included here. The author reveals that the graphene layer exhibits a strong confinement effect on the chemistry of molecules underneath and the intercalated CO can desorb from the Pt surface around room temperature and in UHV, which may promote the CO oxidation confined under graphene.
Download or read book The Effect of Platinum Surface Structure in the Oxidation of Glycerol written by Yang Li and published by . This book was released on 2014 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The surface structures of catalysts have in some instances a large impact on their catalytic properties. On the other hand, historically, mild reactions are not considered to be surface structure sensitive. In this thesis we report on our observation that both the size and the shape of Pt nanoparticles strongly affect the selectivity of glycerol oxidation, a reaction that can proceed at low temperature and under atmospheric pressures. In a series of experiment using Pt/SiO 2 catalysts with average particle sizes varying from 3.9 to 5.7 nm, it was determined that selectivity toward primary carbon oxidation increases as the proportion of larger particles increases. Together with CO IR titration result, these results appears to indicate that larger Pt particles with flat surfaces and extensive fractions of atop and bridge sites may promote primary carbon oxidation, whereas edge, corner, and other low-coordination Pt sites may promote secondary carbon oxidation. Further catalyst characterization and kinetic experiments will be needed to confirm this tentative conclusion. Tetrahedral- and cuboctahedral-shaped Pt catalysts were also tested for the glycerol oxidation reaction, and cuboctahedral-shaped Pt nanoparticles were found to display higher activity and higher selectivity toward primary carbon oxidation.
Download or read book Electrocatalysis written by and published by The Electrochemical Society. This book was released on 2006 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals of Industrial Catalytic Processes written by C. H. Bartholomew and published by John Wiley & Sons. This book was released on 2011-11-30 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysis is central to the chemical industry, as it is directly or involved in the production of almost all useful chemical products. In this book the authors, present the definitive account of industrial catalytic processes. Throughout Fundamentals of Industrial Catalytic Processes the information is illustrated with many case studies and problems. This book is valuable to anyone wanting a clear account of industrial catalytic processes, but is particularly useful to industrial and academic chemists and engineers and graduate working on catalysis. This book also: Covers fundamentals of catalytic processes, including chemistry, catalyst preparation, properties and reaction engineering. Addresses heterogeneous catalytic processes employed by industry. Provides detailed data on existing catalysts and catalytic reactions, process design and chemical engineering. Covers catalysts used in fuel cells.
Download or read book Pt Platinum written by Gary J.K. Acres and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Like most supplement volumes of the platinum-group metal series,Platinum Suppl. Vol. A 1 has been written by an international team of specialists. It comprises technological data of all six platinum-group metals and their technically relevant alloys and compounds. The volume starts with a review on the recovery of the platinum-group metals (23 pages); the next 42 pages are devoted to processes for separating and refining the PGM in order to obtain metals of high purity. The electrodeposition of the PGM and their alloys is treated on 26 pages.The by far most extensive section deals with PGMand their alloys and compounds in catalysis. After a historicalsurvey and alist of important reviewson PGMcatalysis,the catalytic properties of the metals are treated in a general way, followed by unsupported metals and alloys including preparation of catalysts and their reactions in various industrial processes. The role of supported metals and alloys is described in asimilar manner. This isfollowed byan extensive description of the preparation and the reactions of PGM compounds with various nonmetals and their catalytically active role in a number of industrial processes (226 pages). The last chapter (21 pages) is a compilation of data on the medical use of cytostatic platinum compounds. Gelnhausen, December 1985 Kurt Swars IX Table of Contents Page Technology ofthe Platinum-Group Metals. ............................... 1 1 Review on the Recovery ofthe Platinum-Group Metals . 1.1 Historical Perspective , , , . Period of Discovery, 1750 to 1820 , , . First Industrial Period 1820 to 1900 , , , .
Download or read book Polymer Electrolyte Fuel Cells written by Alejandro A. Franco and published by CRC Press. This book was released on 2016-04-19 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the recent research progress on the fundamental understanding of the materials degradation phenomena in PEFC, for automotive applications. On a multidisciplinary basis, through contributions of internationally recognized researchers in the field, this book provides a complete critical review on crucial scientific topics related
Download or read book Metallic Nanostructures written by Yujie Xiong and published by Springer. This book was released on 2014-10-31 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book details the design for creation of metal nanomaterials with optimal functionality for specific applications. The authors describe how to make desired metal nanomaterials in a wet lab. They include an overview of applications metal nanomaterials can be implemented in and address the fundamentals in the controlled synthesis of metal nanostructures.
Download or read book Methods of Surface Analysis written by A.W. Czanderna and published by Elsevier. This book was released on 2012-12-02 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methods of Surface Analysis deals with the determination of the composition of surfaces and the identification of species attached to the surface. The text applies methods of surface analysis to obtain a composition depth profile after various stages of ion etching or sputtering. The composition at the solid—solid interface is revealed by systematically removing atomic planes until the interface of interest is reached, in which the investigator can then determine its composition. The book reviews the effect of ion etching on the results obtained by any method of surface analysis including the effect of the rate of etching, incident energy of the bombarding ion, the properties of the solid, the effect of the ion etching on generating an output signal of electrons, ions, or neutrals. The text also describes the effect of the residual gases in the vacuum environment. The book considers the influence of the sample geometry, of the type (metal, insulator, semiconductor, organic), and of the atomic number can have on surface analysis. The text describes in detail low energy ion scattering spectroscopy, X-ray photoelectron spectroscopy, Auger electron spectroscopy, secondary ion mass spectroscopy, and infrared reflection-absorption spectroscopy. The book can prove useful for researchers, technicians, and scientists whose works involve organic chemistry, analytical chemistry, and other related fields of chemistry, such as physical chemistry or inorganic chemistry.
Download or read book Research and Development in Progress written by and published by . This book was released on 1973 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalysis written by John R. Anderson and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of a commercially successful process for the catalytic synthesis of ammonia was a scientific as well as a technical triumph. Its implications were con siderable. It demonstrated the power of a combination of innovative technology and engineering together with basic chemical science, and it introduced ideas and techniques into catalytic science and process engineering which are still with us today. In a real sense, this process changed the face of industrial chemistry and process technology. Of course, the key step in the direct synthesis of ammonia was the development of an efficient catalyst, and the historical account given by Dr. S. A. Topham in the first chapter of this volume shows how this was success fully accomplished, and how this was combined with the successful solution of other daunting technical problems to make the overall process possible. The microstructure of a catalyst is an important feature which determines its behaviour, and the electron microscope is one of the most important instrumental methods by means of which structural and microstruc tural information can be obtained. Nevertheless, the elec tron-optical processes of image formation are complex, but need to be properly understood if image interpreta tion is to be done reliably. In the second chapter of this volume, Dr. J. V. Sanders addresses the entire field of the application of electron microscopic methods to the examination of catalysts.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modern Heterogeneous Catalysis written by Rutger A. van Santen and published by John Wiley & Sons. This book was released on 2017-06-19 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by one of the world's leading experts on the topic, this advanced textbook is the perfect introduction for newcomers to this exciting field. Concise and clear, the text focuses on such key aspects as kinetics, reaction mechanism and surface reactivity, concentrating on the essentials. The author also covers various catalytic systems, catalysis by design, and activation-deactivation. A website with supplementary material offers additional figures, original material and references.
