Rhodium Catalysts In The Oxidation Of Co By O2 And No

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Rhodium Catalysts in the Oxidation of CO by O2 and NO

Author :
Publisher :
ISBN 13 :
Total Pages : 131 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Rhodium Catalysts in the Oxidation of CO by O2 and NO by :

Download or read book Rhodium Catalysts in the Oxidation of CO by O2 and NO written by and published by . This book was released on 2010 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is well known that the activity, selectivity, and deactivation behavior of heterogeneous catalysts are strongly affected by a wide variety of parameters, including but not limited to nanoparticle size, shape, composition, support, pretreatment conditions, oxidation state, and electronic state. Enormous effort has been expended in an attempt to understand the role of these factors on catalytic behavior, but much still remains to be discovered. In this work, we have focused on deepening the present understanding of the role of nanoparticle shape, nanoparticle composition, and hot electrons on heterogeneous catalysis in the oxidation of carbon monoxide by molecular oxygen and nitric oxide. These reactions were chosen because they are important for environmental applications, such as in the catalytic converter, and because there is a wide range of experimental and theoretical insight from previous single crystal work as well as experimental data on nanoparticles obtained using new state-of-the-art techniques that aid greatly in the interpretation of results on complex nanoparticle systems. In particular, the studies presented in this work involve three types of samples: ̃6.5 nm Rh nanoparticles of different shapes, ̃15 nm Rh1-xPdx core-shell bimetallic polyhedra nanoparticles, and Rh ultra-thin film ( ̃5 nm) catalytic nanodiodes. The colloidal nanoparticle samples were synthesized using a co-reduction of metal salts in alcohol and supported on silicon wafers using the Langmuir-Blodgett technique. This synthetic strategy enables tremendous control of nanoparticle size, shape, and composition. Nanoparticle shape was controlled through the use of different organic polymer capping layers. Bimetallic core-shell nanoparticles were synthesized by careful choice of metal salt precursors. Rh/TiOx and Rh/GaN catalytic nanodiodes were fabricated using a variety of thin film device fabrication techniques, including reactive DC magnetron sputtering, electron beam evaporation, and rapid thermal annealing. The combination of these techniques enabled control of catalytic nanodiode morphology, geometry, and electrical properties.

Absorption and Oxidation of Carbon Monoxide on Rhodium (110)

Author : Maria Shoukat
Publisher :
ISBN 13 :
Total Pages : 39 pages
Book Rating : 4.:/5 (17 download)

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Book Synopsis Absorption and Oxidation of Carbon Monoxide on Rhodium (110) by : Maria Shoukat

Download or read book Absorption and Oxidation of Carbon Monoxide on Rhodium (110) written by Maria Shoukat and published by . This book was released on 2018 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction of carbon monoxide (CO) and oxygen on Rhodium (Rh) is very interesting and important due to its applications in catalysis ( e.g., catalytic converters in automobiles). The main purpose of our research is to study the reaction between oxygen atoms and carbon monoxide molecules present on Rhodium terraces, as well as the binding of carbon monoxide molecules to the surface. In particular, we are looking at the mechanism at low temperatures where catalytic converters are not as effective. Our primary objective was to study the effect on the results of varying the rate constants for the different processes (CO oxidation, CO binding to the surface, CO mobility). To this end, we have developed a computer simulation program incorporating the rate constants as variable parameters. The magnitude of the rate constants is related to the relative strengths (probabilities) of the interactions. So, as we identified particular interactions {values of rate constants) that led to enhanced reactivity, we gained a better understanding of how the proposed mechanism relates to the physical processes occurring. This basic understanding of the reaction system may eventually lead to modifications that will improve the function of the catalyst.

Handbook Of Advanced Methods And Processes In Oxidation Catalysis: From Laboratory To Industry

Author : Daniel Duprez
Publisher : World Scientific
ISBN 13 : 1783263342
Total Pages : 1035 pages
Book Rating : 4.7/5 (832 download)

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Book Synopsis Handbook Of Advanced Methods And Processes In Oxidation Catalysis: From Laboratory To Industry by : Daniel Duprez

Download or read book Handbook Of Advanced Methods And Processes In Oxidation Catalysis: From Laboratory To Industry written by Daniel Duprez and published by World Scientific. This book was released on 2014-07-24 with total page 1035 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a comprehensive overview of the most recent developments in both total oxidation and combustion and also in selective oxidation. For each topic, fundamental aspects are paralleled with industrial applications. The book covers oxidation catalysis, one of the major areas of industrial chemistry, outlining recent achievements, current challenges and future opportunities. One distinguishing feature of the book is the selection of arguments which are emblematic of current trends in the chemical industry, such as miniaturization, use of alternative, greener oxidants, and innovative systems for pollutant abatement. Topics outlined are described in terms of both catalyst and reaction chemistry, and also reactor and process technology.

An Infrared Study of the Oxidation of Carbon Monoxide Over Supported Rhodium Catalysts

Author : C. H. Dai
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis An Infrared Study of the Oxidation of Carbon Monoxide Over Supported Rhodium Catalysts by : C. H. Dai

Download or read book An Infrared Study of the Oxidation of Carbon Monoxide Over Supported Rhodium Catalysts written by C. H. Dai and published by . This book was released on 1985 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reaction of carbon monoxide and oxygen over supported rhodium films has been studied using infrared spectroscopy. The focus of work was the reactivity of the various CO/Rh/X (X=Al2O3, SiO2, TiO2) surface states for supported catalysts having high and low Rh loading. Under the reaction conditions the 'linear CO' species was the most stable toward oxidation, but this could have been a result of an oxidized Rh surface. A new CO/Rh surface species has been proposed which exhibits an infrared band at 2000/cm for a 0.5% Rh/TiO2 film. This species is believed to be a bridged carbonyl between Rh+1 and the TiO2 support. Originator-supplied keywords include: Infrared spectroscopy, and Carbon dioxide.

Catalysis and Automotive Pollution Control III

Author : A. Frennet
Publisher : Elsevier
ISBN 13 : 0080544681
Total Pages : 959 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Catalysis and Automotive Pollution Control III by : A. Frennet

Download or read book Catalysis and Automotive Pollution Control III written by A. Frennet and published by Elsevier. This book was released on 1995-11-02 with total page 959 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings are based on the third of a series of symposia devoted to the use of catalysis for the depollution of exhaust gases of motor vehicles. Although catalysts have been used for this purpose for some thirty years, the subject is still very topical because of its economic impact. The increasing number of submitted, accepted and published papers amply attests to this fact.

Past and Present in DeNOx Catalysis: From Molecular Modelling to Chemical Engineering

Author : Pascal Granger
Publisher : Elsevier
ISBN 13 : 0080554059
Total Pages : 419 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Past and Present in DeNOx Catalysis: From Molecular Modelling to Chemical Engineering by : Pascal Granger

Download or read book Past and Present in DeNOx Catalysis: From Molecular Modelling to Chemical Engineering written by Pascal Granger and published by Elsevier. This book was released on 2007-12-15 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers an overview of the state of the art in the field of DeNOx catalysis in order to focus novel orientations, new technological developments, from laboratory to industrial scale. A particular attention has been paid towards the implementation of catalytic processes for minimising NOx emissions either from stationary or mobile sources under lean condition to meet future standard regulations of NOx emissions. In the first part of this book, critical aspects reported in the literature which usually make difficult the achievement of efficient catalytic technologies in those conditions are summarised and analysed in order two separate new perspectives. The second part deals with fundamental aspects at molecular level. A better understanding of the reactions involved under unsteady-state conditions is probably a pre-requisite step for improving the performances of the actual processes or developing original ones. The development of powerful in situ spectroscopic techniques is of fundamental interest for kinetic modelling. Correlations between spectroscopic and kinetic data with those obtained from theoretical calculations are reported. Some illustrations emphasise the fact that these comparisons may help in determining the nature of the catalytic active sites and building predictive tools for simulations under running conditions. The latter part of this book will be illustrated by different practical approaches covering various aspects related to the catalysts preparation and the development of alternative technologies which include industrial considerations. - New technological developments for investigating catalytic reactions in transient conditions (in situ and operando spectroscopic techniques) - Concerted approaches in DeNOx catalysis - How academic aspects (kinetic, in situ spectroscopic measurements) can provide useful information for practical applications - Comparison of different approaches provided by academic and industrial partners

Emissions Control Catalysis

Author : Ioannis V. Yentekakis
Publisher : MDPI
ISBN 13 : 3039360361
Total Pages : 448 pages
Book Rating : 4.0/5 (393 download)

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Book Synopsis Emissions Control Catalysis by : Ioannis V. Yentekakis

Download or read book Emissions Control Catalysis written by Ioannis V. Yentekakis and published by MDPI. This book was released on 2020-06-18 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The important advances achieved over the past years in all technological directions (industry, energy, and health) contributing to human well-being are unfortunately, in many cases, accompanied by a threat to the environment, with photochemical smog, stratospheric ozone depletion, acid rain, global warming, and finally climate change being the most well-known major issues. These are the results of a variety of pollutants emitted through these human activities. The indications show that we are already at a tipping point that might lead to non-linear and sudden environmental change on a global scale. Aiming to tackle these adverse effects in an attempt to mitigate any damage that has already occurred and to ensure that we are heading toward a cleaner (green) and sustainable future, scientists around the world are developing tools and techniques to understand, monitor, protect, and improve the environment. Emissions control catalysis is continuously advancing, providing novel, multifunctional, and optimally promoted using a variety of methods, nano-structured catalytic materials, and strategies (e.g., energy chemicals recycling, cyclic economy) that enable us to effectively control emissions, either of mobile or stationary sources, improving the quality of air (outdoor and indoor) and water and the energy economy. Representative cases include the abatement and/or recycling of CO2, CO, NOx, N2O, NH3, CH4, higher hydrocarbons, volatile organic compounds (VOCs), particulate matter, and specific industrial emissions (e.g., SOx, H2S, dioxins aromatics, and biogas). The “Emissions Control Catalysis” Special Issue has succeeded in collecting 22 high-quality contributions, included in this MDPI open access book, covering recent research progress in a variety of fields relevant to the above topics and/or applications, mainly on: (i) NOx catalytic reduction from cars (i.e., TWC) and industry (SCR) emissions; (ii) CO, CH4, and other hydrocarbons removal, and (iii) CO2 capture/recirculation combining emissions control with added-value chemicals production.

Catalyst Preparation

Author : John Regalbuto
Publisher : CRC Press
ISBN 13 : 1420006509
Total Pages : 490 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis Catalyst Preparation by : John Regalbuto

Download or read book Catalyst Preparation written by John Regalbuto and published by CRC Press. This book was released on 2016-04-19 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text explores the optimization of catalytic materials through traditional and novel methods of catalyst preparation, characterization, and monitoring for oxides, supported metals, zeolites, and heteropolyacids. It focuses on the synthesis of bulk materials and of heterogeneous materials, particularly at the nanoscale. The final chapters examine pretreatment, drying, finishing effects, and future applications involving catalyst preparation and the technological advances necessary for continued progress. Topics also include heat and mass transfer limitations, computation methods for predicting properties, and catalyst monitoring on laboratory and industrial scales.

Evidence for an Oxygen Intermediate in the Catalytic Reduction of NO by CO on Rhodium Surfaces

Author : L. H. Dubois
Publisher :
ISBN 13 :
Total Pages : 29 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Evidence for an Oxygen Intermediate in the Catalytic Reduction of NO by CO on Rhodium Surfaces by : L. H. Dubois

Download or read book Evidence for an Oxygen Intermediate in the Catalytic Reduction of NO by CO on Rhodium Surfaces written by L. H. Dubois and published by . This book was released on 1980 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evidence for an oxygen intermediate in the reaction of NO and CO to form N2 and CO2 over rhodium surfaces is presented. High resolution electron energy loss spectroscopy (ELS) measurements indicate that both NO and CO molecules associatively adsorb on the Rh(331) single crystal surface at 300 K. Chemisorbed NO readily dissociates on this surface upon heating at 450 K. At 700 K high resolution ELS and Auger electron spectroscopy (AES) both indicate that only oxygen is present on the catalyst surface. N2 desorption below this temperature is easily detected by mass spectroscopy. The addition of CO to this surface oxygen at 700 K results in the formation of gaseous CO2 and the removal of the surface oxygen species. Similar results were obtained when O2 was substituted for NO as a control indicating that oxygen is indeed a surface intermediate under our experimental conditions. (Author).

Combustion Technology for a Clean Environment

Author : Maria Carvalho
Publisher : CRC Press
ISBN 13 : 9781560329770
Total Pages : 1576 pages
Book Rating : 4.3/5 (297 download)

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Book Synopsis Combustion Technology for a Clean Environment by : Maria Carvalho

Download or read book Combustion Technology for a Clean Environment written by Maria Carvalho and published by CRC Press. This book was released on 2002-11-08 with total page 1576 pages. Available in PDF, EPUB and Kindle. Book excerpt: The more than 90 refereed papers in this volume continue a series of biannual benchmarks for technologies that maximize energy conversion while minimizing undesirable emissions. Covering the entire range of industrial and transport combustion as well as strategies for energy research and development, these state-of-the-art will be indispensable to mechanical and chemical engineers in academia and industry and technical personnel in military, energy and environmental government agencies. The topics covered in this book include wood, oil, gas and coal combustion, combustion of alternative fuels, co-combustion and co-gasification, catalytic combustion, NO, SO, soot fundamentals, advanced diagnostics, burners, fluidized bed combustion, incineration, engines, advanced cycles, gas clean-up, control strategy and clean combustion in process industries.

Introduction to Surface Physical Chemistry

Author : K. Christmann
Publisher : Springer Science & Business Media
ISBN 13 : 3662080095
Total Pages : 283 pages
Book Rating : 4.6/5 (62 download)

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Book Synopsis Introduction to Surface Physical Chemistry by : K. Christmann

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:

Structured Catalysts and Reactors

Author : Andrzej Cybulski
Publisher : CRC Press
ISBN 13 : 1420028006
Total Pages : 828 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis Structured Catalysts and Reactors by : Andrzej Cybulski

Download or read book Structured Catalysts and Reactors written by Andrzej Cybulski and published by CRC Press. This book was released on 2005-11-02 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in structured catalysts is steadily increasing due to the already proven, as well as potential, advantages of these catalysts. Updating the comprehensive coverage of the first edition published in 1998 with the latest science and applications, Structured Catalysts and Reactors, Second Edition gives detailed information on all aspect

Introduction to Condensed Matter Chemistry

Author : Jihong Yu
Publisher : Elsevier
ISBN 13 : 0443161410
Total Pages : 462 pages
Book Rating : 4.4/5 (431 download)

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Book Synopsis Introduction to Condensed Matter Chemistry by : Jihong Yu

Download or read book Introduction to Condensed Matter Chemistry written by Jihong Yu and published by Elsevier. This book was released on 2024-06-10 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to Condensed Matter Chemistry offers a general view of chemistry from the perspective of condensed matter chemistry, analyzing and contrasting chemical reactions in a more realistic setting than traditional thinking. Readers will also find discussions on the goals and major scientific questions in condensed matter chemistry and the molecular engineering of functional condensed matter. Processes and products of chemical reactions should not be determined solely by the structure and composition of these basic species but also by the complex and possibly multilevel structured physical and chemical environment, together referred to as their condensed state. Relevant matters in condensed state should be the main bodies of chemical reactions, which is applicable not only to solids and liquids but also to gas molecules as reactions among gas molecules can take place only in the presence of catalysts in specific condensed states or after their state transition under extreme reaction conditions. This book provides new insights on the liquid state chemistry, definitions, aspects, and interactions, summarizing fundamentals of main chemical reactions from a new perspective. Helps to establish the new field of Condensed Matter Chemistry Highlights the molecular engineering of functional condensed matter Focuses on both liquid and solid state chemistry

Homogeneous Catalysis with Metal Phosphine Complexes

Author : Louis M. Pignolet
Publisher : Springer Science & Business Media
ISBN 13 : 1461336236
Total Pages : 494 pages
Book Rating : 4.4/5 (613 download)

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Book Synopsis Homogeneous Catalysis with Metal Phosphine Complexes by : Louis M. Pignolet

Download or read book Homogeneous Catalysis with Metal Phosphine Complexes written by Louis M. Pignolet and published by Springer Science & Business Media. This book was released on 2013-11-21 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of transition metal catalysis has experienced incredible growth during the past decade. The reasons for this are obvious when one considers the world's energy problems and the need for new and less energy demanding syntheses of important chemicals. Heterogeneous catalysis has played a major industrial role; however, such reactions are generally not selective and are exceedingly difficult to study. Homogeneous catalysis suffers from on-site engineering difficulties; however, such reactions usually provide the desired selectivity. For example, Monsanto's synthesis of optically-active amino acids employs a chiral homogeneous rhodium diphosphine catalyst. Industrial uses of homogeneous catalyst systems are increasing. It is not by accident that many homogeneous catalysts contain tertiary phosphine ligands. These ligands possess the correct steric and electronic properties that are necessary for catalytic reactivity and selectivity. This point will be emphasized throughout the book. Thus the stage is set for a comprehensive be treatment of the many ways in which phosphine catalyst systems can designed, synthesized, and studied.

Thermochemical Processes

Author : C. B. Alcock
Publisher : Elsevier
ISBN 13 : 0080519172
Total Pages : 400 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Thermochemical Processes by : C. B. Alcock

Download or read book Thermochemical Processes written by C. B. Alcock and published by Elsevier. This book was released on 2000-12-18 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today the study of materials is concerned with the underlying thermodynamic and chemical processes involved in the manufacture and processing of a wide range of materials - metals, ceramics, semi-conductors, plastics and composites. For the first time, this book provides a quantitative description and examples of the application of physical chemical concepts to the processing and degradation of metallic and other inorganic materials, from the atomic scale to the analysis of industrial processes. Thermochemical Processes: Principles and Models deals with processes dominated in turn by the gas phase (such as chemical vapour deposition), the solid phase (such as powder metallurgy electroceramics and high-temperature corrosion) and the liquid phase (such as extraction metallurgy and glass-making). C. B. Alcock provides information which will prove invaluable to academics and workers involved in high temperature industries and in particular to those with an interest in the scientific analysis of processes - which will be most useful to those working in the field of modelling. First ever quantitative approach to the subject of Thermochemical processing Companion volume to Kubachewski et al

Dissertation Abstracts International

Author :
Publisher :
ISBN 13 :
Total Pages : 1006 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Dissertation Abstracts International by :

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Nanohybrids in Environmental & Biomedical Applications

Author : Surender Kumar Sharma
Publisher : CRC Press
ISBN 13 : 1351256831
Total Pages : 396 pages
Book Rating : 4.3/5 (512 download)

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Book Synopsis Nanohybrids in Environmental & Biomedical Applications by : Surender Kumar Sharma

Download or read book Nanohybrids in Environmental & Biomedical Applications written by Surender Kumar Sharma and published by CRC Press. This book was released on 2019-07-09 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterostructured nanoparticles have the capability for a broad range of novel and enhanced properties, which leads to appealing biomedical and environmental applications. This timely new book addresses the design and preparation of multiphase nanomaterials with desired size, shape, phase composition, and crystallinity, as well as their current applications. It emphasizes key examples to motivate deeper studies, including nanomaterial-based hyperthermia treatment of cancer, nanohybrids for water purification, nanostructures used in the removal or detection of bioagents from waste water, and so on. Features Presents state of the art research on heterostructured nanomaterials, from their synthesis and physiochemical properties to current environmental and biological applications. Includes details on toxicity and risk assessment of multifunctional nanomaterials. Discusses recent developments and utilization in healthcare by leading experts. Introduces the main features of functionalization of nanomaterials in terms of desired size, shape, phase composition, surface functionalization/coating, toxicity, and geometry. Emphasizes practical applications in the environmental and biomedical sectors.