Selective Oxidation of Ethylene Over Supported Ag and Bimetallic Au-Ag Catalysts PDF Download

Author: Siriphong Rojluechai
Publisher:
ISBN: 9789749990131
Category :
Languages : en
Pages : 262

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Author: G. Centi
Publisher: Elsevier
ISBN: 0080879187
Category : Technology & Engineering
Languages : en
Pages : 907

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Approx.890 pages

Author: S. Ted Oyama
Publisher: Elsevier
ISBN: 0080558011
Category : Technology & Engineering
Languages : en
Pages : 524

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The catalytic epoxidation of olefins plays an important role in the industrial production of several commodity compounds, as well as in the synthesis of many intermediates, fine chemicals, and pharmaceuticals. The scale of production ranges from millions of tons per year to a few grams per year. The diversity of catalysts is large and encompasses all the known categories of catalyst type: homogeneous, heterogeneous, and biological. This book summarizes the current status in these fields concentrating on rates, kinetics, and reaction mechanisms, but also covers broad topics including modeling, computational simulation, process concepts, spectroscopy and new catalyst development. The similarities and distinctions between the different reaction systems are compared, and the latest advances are described. Comprehensive listing of epoxide products Broad comparison of turnover frequencies of homogeneous, hetergeneous, main-group, biomimetic and biological catalysts Analysis of the general strengths and weaknesses of varied catalytic systems Detailed description of the mechanisms of reaction for classical and emerging catalysts

Author:
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ISBN:
Category :
Languages : en
Pages :

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The selective oxidation of ethylene to ethylene epoxide (C2H4 + 1/2 O2 .-->. C2H4O) over Ag is the simplest example of kinetically-controlled, selective heterogeneous catalysis. We have studied the steady-state kinetics and selectivity of this reaction for the first time on a clean, well-characterized Ag(110) surface by using a special apparatus which allows rapid (approx. 20 s) transfer between a high-pressure catalytic microreactor and an ultrahigh vacuum surface analysis (AES, XPS, LEED, TDS) chamber. The effects of temperature and reactant pressures upon the rate and selectivity are virtually identical on Ag(110) and supported, high-surface-area Ag catalysts. The absolute specific rate (per Ag surface atom) is however some 100-fold higher for Ag(110) than for high-surface-area catalysts. This is related to the well-known structural sensitivity of this reaction. It is postulated that a small percentage of (110) planes (or (110)-like sites) are responsible for most of the catalytic activity of high-surface-area catalysts. The high activity of the (110) plane is attributed to its high sticking probability for dissociative oxygen adsorption, since the rate of ethylene epoxidation is shown in a related work to be proportional to the coverage of atomically adsorbed oxygen at constant temperature and ethylene pressure.

Author: V. Cortés Corberán
Publisher: Elsevier
ISBN: 008087990X
Category : Technology & Engineering
Languages : en
Pages : 907

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This volume contains invited papers and communications presented at the Second World Congress and Fourth European Workshop Meeting on New Developments in Selective Oxidation. The purpose of the meeting was to present new topics and recent advances as well as the discussion of new aspects of fundamental and applied aspects of partial selective oxidation in heterogeneous and homogeneous catalysis. The following topics were discussed: New processes for fine chemicals by catalytic oxidation; Recent developments in surface chemistry of oxide catalysts; Novel catalytic systems and preparation methods; Heterogenized homogeneous oxidation catalysts; Selective oxidation and oxidative dehydrogenation of alkanes; New industrial developments based on catalytic oxidation reactions; Bio-, photo-, and electro-catalytic oxidation; Oxidation by other agents than dioxygen; Bifunctional metal-on-metal oxide catalysts for selective oxidation. This book provides a valuable set of data on selective oxidation reactions which will be extremely useful to catalyst and related practitioners, whether fundamentalists or highly applied, and to process engineers who wish to evaluate current findings in this field.

Author: Vladislav A. Sadykov
Publisher: Elsevier
ISBN: 012814808X
Category : Technology & Engineering
Languages : en
Pages : 590

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Advanced Nanomaterials for Catalysis and Energy: Synthesis, Characterization and Applications outlines new approaches to the synthesis of nanomaterials (synthesis in flow conditions, laser electrodispersion of single metals or alloys on carbon or oxide supports, mechanochemistry, sol-gel routes, etc.) to provide systems with a narrow particle size distribution, controlled metal-support interaction and nanocomposites with uniform spatial distribution of domains of different phases, even in dense sintered materials. Methods for characterization of real structure and surface properties of nanomaterials are discussed, including synchrotron radiation diffraction and X-ray photoelectron spectroscopy studies, neutronography, transmission/scanning electron microscopy with elemental analysis, and more. The book covers the effect of nanosystems' composition, bulk and surface properties, metal-support interaction, particle size and morphology, deposition density, etc. on their functional properties (transport features, catalytic activity and reaction mechanism). Finally, it includes examples of various developed nanostructured solid electrolytes and mixed ionic-electronic conductors as materials in solid oxide fuel cells and asymmetric supported membranes for oxygen and hydrogen separation. Outlines synthetic and characterization methods for nanocatalysts Relates nanocatalysts' properties to their specific applications Proposes optimization methods aiming at specific applications

Author: Zhen Ma
Publisher: Royal Society of Chemistry
ISBN: 1782621644
Category : Science
Languages : en
Pages : 635

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Once considered an inert element, gold has recently gained attention as a catalyst. With hundreds of papers being published each year, this book presents a comprehensive review of this rapidly-evolving field, with contributions by leading experts across the globe. Going through the chapters citing the primary literature, the reader will gain a thorough background to the use of gold in catalysis, as well as the latest methods for the preparation of gold catalysts. Other chapters demonstrate the characterisation and modelling of gold-catalysed reactions, with consideration given to both the fundamentals and commercial applications of this emerging group of catalysts. Written to be accessible by postgraduates and newcomers to the field, this book will also benefit experienced researchers and therefore be an essential reference in the laboratory.

Author: C Kemball
Publisher: Royal Society of Chemistry
ISBN: 1847553133
Category : Technology & Engineering
Languages : en
Pages : 442

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There is an increasing challenge for chemical industry and research institutions to find cost-efficient and environmentally sound methods of converting natural resources into fuels chemicals and energy. Catalysts are essential to these processes and the Catalysis Specialist Periodical Report series serves to highlight major developments in this area. This series provides systematic and detailed reviews of topics of interest to scientists and engineers in the catalysis field. The coverage includes all major areas of heterogeneous and homogeneous catalysis and also specific applications of catalysis such as NOx control kinetics and experimental techniques such as microcalorimetry. Each chapter is compiled by recognised experts within their specialist fields and provides a summary of the current literature. This series will be of interest to all those in academia and industry who need an up-to-date critical analysis and summary of catalysis research and applications. Catalysis will be of interest to anyone working in academia and industry that needs an up-to-date critical analysis and summary of catalysis research and applications. Specialist Periodical Reports provide systematic and detailed review coverage in major areas of chemical research. Compiled by teams of leading experts in their specialist fields, this series is designed to help the chemistry community keep current with the latest developments in their field. Each volume in the series is published either annually or biennially and is a superb reference point for researchers. www.rsc.org/spr

Author: Yi-Jun Xu
Publisher:
ISBN:
Category : Alkenes
Languages : en
Pages : 0

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Author: John H. Sinfelt
Publisher: Wiley-Interscience
ISBN:
Category : Science
Languages : en
Pages : 190

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Presents an account of the research on bimetallic catalysts. Focuses attention on the possibility of influencing the selectivity of chemical transformations on metal surfaces and preparing metal alloys in a highly dispersed state. Covers the validation and elucidation of the bimetallic cluster concept. Includes figures and tables.