Download or read book Sulfur Interactions on Metal and Oxide Surfaces written by Qifei Wu and published by . This book was released on 2003 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Auger Analysis of Oxygen and Sulfur Interactions with Various Metals and the Effect of Sliding on These Interactions written by Donald H. Buckley and published by . This book was released on 1973 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Various gases were adsorbed to copper, aluminum, and chromium surfaces. The gases included oxygen, hydrogen sulfide, methyl mercaptan, and sulfur dioxide. Chemisorption was conducted on static surfaces and during dynamic friction experiments. An Auger cyclindrical mirror analyzer was used to monitor surface films. The sulfur containing gases adsorbed readily to all surfaces. Exposures of as little as 0.000001 (torr)(sec) (1 langmuir) were sufficient to reduce friction. Sliding contact did not affect chemisorption of copper or aluminum but did affect chemisorption to chromium surfaces. Oxygen removed sulfur films from all surfaces at room temperature (23 C). Gaseous exposures were from 0.000001 to 0.01 (torr)(sec) (1 to 10,000 langmuirs).
Download or read book The Surface Science of Metal Oxides written by Victor E. Henrich and published by Cambridge University Press. This book was released on 1994 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publisher Description
Download or read book Oxygen and Sulfur Interactions with a Clean Iron Surface and the Effect of Rubbing Contact on These Interactions written by Donald H. Buckley and published by . This book was released on 1973 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction of sulfur and oxygen with an iron surface was studied with Auger spectroscopy analysis both statically and during sliding-friction experiments in a vacuum environment. Oxygen, hydrogen sulfide, methyl mercaptan, and sulfur dioxide were adsorbed to an iron surface. Results indicate that sulfide films formed on clean iron surfaces are completely displaced by oxygen. Hydrocarbons containing sulfur, such as methyl mercaptan, adsorb dissociatively. Less sulfur is adsorbed during sliding with hydrogen sulfide and methyl mercaptan than in the absence of sliding. With both oxygen and sulfur dioxide, sliding did not affect the amount of material adsorbed to iron.
Download or read book Theoretical Investigations of the Interactions of Oxygen and Sulfur at a Nickel Surface written by Lauri Samuli Pirttiaho and published by . This book was released on 1997 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies of Organophosphorus Nitrogen and Sulfur Containing Molecules on Surfaces written by J. M. White and published by . This book was released on 1986 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research program encompasses a broadly based surface chemistry study of organophosphorus and organosulfur compounds chemisorbed on and reacting at metal and metal oxide surfaces. Particular attention has been given to phosphine and dimethyl methylphosphonate. The interactions of these molecules with iron, oxidized iron, silica and rhodium have been studied. A thorough surface science study of sulfur adsorption on nickel and its effect on CO chemisorption has also been completed.
Download or read book Oxide Surfaces written by and published by Elsevier. This book was released on 2001-05-21 with total page 677 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is a multi-author survey (in 15 chapters) of the current state of knowledge and recent developments in our understanding of oxide surfaces. The author list includes most of the acknowledged world experts in this field. The material covered includes fundamental theory and experimental studies of the geometrical, vibrational and electronic structure of such surfaces, but with a special emphasis on the chemical properties and associated reactivity. The main focus is on metal oxides but coverage extends from 'simple' rocksalt materials such as MgO through to complex transition metal oxides with different valencies.
Download or read book Dynamics of Molecule Surface Interactions on Metal Oxides written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interactions of vibrationally excited HCI(v =2) with MgO(100) surfaces have been examined in detail, with scattered HCI(v =2) detected state selectively by resonance enhanced multiphoton ionization (REMPI). Simulations using a random walk model and 'best estimates' for activation energies for desorption and hopping suggest that deactivation probably occurs at steps. In parallel, a new apparatus has been designed and built for a next generation of studies of molecular interactions on insulating oxide surfaces. Specifically, FTIR will be used to determine geometries and adsorption, and TPD, REMPI and other laser-based spectroscopies will be used to interrogate interactions of molecules and radicals with the surface and with other adsorbates.
Download or read book Interactions Between Metal Surfaces and Atmospheric Sulphur Dioxide written by John Roderick Duncan and published by . This book was released on 1973 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transition Metal Oxides written by H.H. Kung and published by Elsevier. This book was released on 1989-04-01 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book the author presents an up-to-date summary of existing information on the structure, electronic properties, chemistry and catalytic properties of transition metal oxides.The subjects covered in the book can be divided into three sections. The first (chapters 1 to 3) covers the structural, physical, magnetic, and electronic properties of transition metal oxides. Although the emphasis is on surface properties, relevant bulk properties are also discussed. The second section (chapters 4 to 7) covers surface chemical properties. It includes topics that describe the importance of surface coordinative unsaturation in adsorption, the formation of surface acidity and the role of acidity in determining surface chemical properties, the nature and reactivities of adsorbed oxygen, and the surface chemistry in the reduction of oxides. The third section (chapters 8 to 14) is on the catalytic properties. Various catalytic reactions including decomposition, hydrogenation, isomerization, metathesis, selective oxidation, and reactions involving carbon oxides are discussed. Emphasis is placed more on reaction mechanisms and the role of catalysts than on kinetics and processes. Chapters on the preparation of oxide catalysts and on photo-assisted processes are also included. Whenever appropriate, relationships between various topics are indicated.Written for surface physicists, chemists, and catalytic engineers, the book will serve as a useful source of information for investigators and as a comprehensive overview of the subject for graduate students.
Download or read book An Investigation Into the Interaction of Some Sulfur Containing Molecules with Metal Surfaces written by Hefin Griffiths and published by . This book was released on 1999 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interactions of Metal and Organic Acid Species with Oxide Surfaces written by S. Hawkins and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book In situ Surface Science Studies of the Interaction Between Sulfur Dioxide and Two dimensional Palladium Loaded cerium zirconium Mixed Metal Oxide Model Catalysts written by Esteban Javier Romano and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cerium and zirconium oxides are important materials in industrial catalysis. Particularly, the great advances attained in the past 30 years in controlling levels of gaseous pollutants released from internal combustion engines can be attributed to the development of catalysts employing these materials. Unfortunately, oxides of sulfur are known threats to the longevity of many catalytic systems by irreversibly interacting with catalytic materials over some time period. In this work, polycrystalline cerium-zirconium mixed-metal-oxide (MMO) solid solutions of various molar ratios were synthesized. High resolution x-ray photoelectron spectroscopy (XPS) was used to characterize the model system. The spectral data was examined for revelation of the surface species that form on these metal oxides after insitu exposures to sulfur dioxide at various temperatures. The model catalysts were exposed to sulfur dioxide using a custom modified in-situ reaction cell. A reliable sample platen heater was designed and built to allow the exposure of the model system at temperatures up to 673 K. The results of this study demonstrate the formation of sulfate and sulfite adsorbed sulfur species. Temperature and compositional dependencies were displayed, with higher temperatures and ceria molar ratios displaying a larger propensity for forming surface sulfur species. In addition to analysis of sulfur photoemission, the photoemission regions of oxygen, zirconium, and cerium were examined for the materials used in this study before and after the aforementioned treatments with sulfur dioxide. The presence of surface hydroxyl groups was observed and metal oxidation state changes were probed to further enhance the understanding of sulfur dioxide adsorption on the synthesized materials. Palladium loaded mixed-metal oxides were synthesized using a unique solid-state methodology to probe the effect of palladium addition on sulfur dioxide adsorption. Microscopic characterization of the wafers made using palladium-loaded MMO materials provide justification for using this material preparation method in surface science studies. The addition of palladium to this model system is shown to have a strong effect on the magnitude of adsorption for sulfur dioxide on some material/exposure condition combinations. Ceria/zirconia sulfite and sulfate species are identified on the palladium-loaded MMO materials with adsorption sites located on the exposed oxide sites.
Download or read book Material Concepts in Surface Reactivity and Catalysis written by Henry Wise and published by Elsevier. This book was released on 2012-12-02 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: Material Concepts in Surface Reactivity and Catalysis focuses on the physical and chemical properties of the surface in a reacting system, identifying surface properties that influence interfacial reactions in metal and nonmetal systems. This book discusses the bulk and surface imperfections, surface energy of multicomponent systems, adsorption isotherms and isosteres, and Lennard-Jones potential curves. The adsorbate-induced surface reconstruction, metal-support reactions, defect thermodynamics, and defect metal oxides with crystallographic shear structures are also elaborated. This text likewise covers the metal oxide catalysis, component segregation at grain boundaries, diffusion-controlled metal oxidation, and kinetics of metal deposition. This publication is useful to students in materials science, solid-state chemistry, and catalysis, as well as specialists engaged in research.
Download or read book Sarkis written by and published by . This book was released on 1984 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface effects in adhesion friction wear and lubrication written by Donald H. Buckley and published by Elsevier. This book was released on 1981-01-01 with total page 643 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface effects in adhesion, friction, wear, and lubrication
Download or read book Interactions of Sulfur with Nanostructured Early Transition Metal Carbides and Nitrides written by Maha Rachid Hammoud and published by . This book was released on 2007 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
