Evidence for an Oxygen Intermediate in the Catalytic Reduction of NO by CO on Rhodium Surfaces PDF Download
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Author: L. H. Dubois Publisher: ISBN: Category : Languages : en Pages : 29
Book Description
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).
Author: L. H. Dubois Publisher: ISBN: Category : Languages : en Pages : 29
Book Description
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).
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 748
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Pascal Granger Publisher: Elsevier ISBN: 0080554059 Category : Technology & Engineering Languages : en Pages : 419
Book Description
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
Author: Jeong Young Park Publisher: Springer Science & Business Media ISBN: 1461487420 Category : Science Languages : en Pages : 265
Book Description
This unique book covers the latest surface science studies on model catalysts, including single crystals, non-colloidal nanocatalysts, and nanoparticles in various forms with the control of size, shape and composition. This book addresses the issue of bridging “materials and pressure gaps” and also discusses the important issue of metal-oxide interface and hot electron flows in heterogeneous catalysis. The current development of in-situ surface techniques that is relevant to bridging “pressure gaps” is also highlighted.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
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: (almost equal to) 6.5 nm Rh nanoparticles of different shapes, (almost equal to) 15 nm Rh1-xPdx core-shell bimetallic polyhedra nanoparticles, and Rh ultra-thin film ((almost equal to) 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/TiO(subscript x) 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.
Author: Anthony R. Butler Publisher: Royal Society of Chemistry ISBN: 9780854046867 Category : Education Languages : en Pages : 180
Book Description
Designated 'Molecule of the Year' in 1992 in recognition of its many biological roles, nitric oxide has wide significance in the world around us and the story of nitric oxide is still unfolding. This small and seemingly innocent molecule has for many years been known to play a significant role in both the creation of photochemical smogs and in the nitrogen cycle. It has an interesting chemistry as a metal ligand, and the bonding within the nitric oxide molecule has been extensively studied. More recently, the molecule has been in the spotlight for the role it plays in controlling blood flow, in the immune system and in brain activity. Life, Death and Nitric Oxide covers many of the topics relating to nitric oxide, from smog and catalytic converters to tumour growth, blood flow and Viagra, with the aim of finding out why such a simple molecule can do so much.
Author: L. H. Dubois
Author: L. H. Dubois
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Author: Pascal Granger
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Author: Jeong Young Park
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Author: Anthony R. Butler