Hc-Scr Des Nox Sur Catalyseur Perovskite PDF Download
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Author: Pierre Miquel
Publisher: Omniscriptum
ISBN: 9786131509711
Category :
Languages : fr
Pages : 232
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Book Description
Cette étude vise à obtenir la réduction catalytique sélective des oxydes d'azote (NOx), présents dans les gaz de moteur Diesel, par les hydrocarbures et l'hydrogène sur des catalyseurs exempts de platine et rhodium. Le choix s'est reporté sur le palladium (Pd) déposé sur des supports perovskites, l'introduction d'un supplément d'agents réducteurs permettant un gain de conversion des NOx aux faibles températures. La conversion sélective en N2 doit ètre promue, la formation de N2O, souvent observée aux faibles températures et faibles conversions, étant à proscrire en raison de son impact sur l'effet de serre. Cette réaction a été menée sur des perovskites LaFeO3 imprégnées au Pd dans un environnement riche en O2, H2O et CO2. Une forte influence des méthodes de préparation et/ou des modifications du support a été observée, ainsi qu'une influence du précurseur d'imprégnation. Les interactions Pd/support jouent un rôle clé dans la conservation d'une activité en réduction des NOx après vieillissement des catalyseurs. Cet effet est attribué à une plus grande stabilisation de l'état de dispersion du Pd sur la perovskite contrairement aux supports conventionnels tels que l'alumine.
Author: Pierre Miquel
Publisher: Omniscriptum
ISBN: 9786131509711
Category :
Languages : fr
Pages : 232
Get Book Here
Book Description
Cette étude vise à obtenir la réduction catalytique sélective des oxydes d'azote (NOx), présents dans les gaz de moteur Diesel, par les hydrocarbures et l'hydrogène sur des catalyseurs exempts de platine et rhodium. Le choix s'est reporté sur le palladium (Pd) déposé sur des supports perovskites, l'introduction d'un supplément d'agents réducteurs permettant un gain de conversion des NOx aux faibles températures. La conversion sélective en N2 doit ètre promue, la formation de N2O, souvent observée aux faibles températures et faibles conversions, étant à proscrire en raison de son impact sur l'effet de serre. Cette réaction a été menée sur des perovskites LaFeO3 imprégnées au Pd dans un environnement riche en O2, H2O et CO2. Une forte influence des méthodes de préparation et/ou des modifications du support a été observée, ainsi qu'une influence du précurseur d'imprégnation. Les interactions Pd/support jouent un rôle clé dans la conservation d'une activité en réduction des NOx après vieillissement des catalyseurs. Cet effet est attribué à une plus grande stabilisation de l'état de dispersion du Pd sur la perovskite contrairement aux supports conventionnels tels que l'alumine.
Author: Juan Ramón González-Velasco
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 0
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Book Description
NOx removal is still a technological challenge in diesel engines. NOx storage and reduction (NSR), selective catalytic reduction (SCR), and combined NSR-SCR systems are the efficient approaches for diesel exhaust aftertreatment control. However, NSR and combined NSR-SCR technologies require high noble metal loadings, with low thermal stability and high cost. Recently, perovskites have gained special attention as an efficient alternative to substituting noble metals in heterogeneous catalysis. Up to date, few studies analyzed the application of perovskites in automobile catalytic converters. This chapter overviews recent research on development of novel perovskite-based catalysts as a component of single-NSR and hybrid NSR-SCR systems for NOx removal from diesel engine exhaust gases. Results in our laboratory are compared with similar work reported in the literature by other authors. Under realistic conditions, 0.5% Pd,Äì30% La0.5Ba0.5CoO3/Al2O3 catalyst achieves NOx-to-N2 conversion higher than 92% when is coupled with an SCR catalyst placed downstream. The results show promise for a considerably higher thermal stability and lower cost diesel exhaust treatment system.
Author: George J. Antos
Publisher: CRC Press
ISBN:
Category : Science
Languages : en
Pages : 536
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Book Description
This unique, single-source reference offers complete coverage of the process and catalyst chemistry involved in naphtha reforming - from the preparation, characterization, and performance evaluation of catalysts to the operation of the catalyst itself - and evaluates the most recent research into unknown aspects of catalyst reactions, shedding light on the future of catalyst technology. Discussing the complexities of the reforming process, Catalytic Naphtha Reforming delineates commercially available processes and catalysts . . . explores the chemistry of the catalytic sites employed for reactions . . . examines catalyst deactivation, pretreating processes to prevent it, and regeneration processes . . . describes metals recovery as well as significant improvements in platinum reforming catalysts . . . explains process development and modeling . . . presents new commercial technologies . . . and much more.
Author: Fabrizio Cavani
Publisher: John Wiley & Sons
ISBN: 3527629122
Category : Technology & Engineering
Languages : en
Pages : 621
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Book Description
In recent years the need for sustainable process design and alternative reaction routes to reduce industry?s impact on the environment has gained vital importance. The book begins with a general overview of new trends in designing industrial chemical processes which are environmentally friendly and economically feasible. Specific examples written by experts from industry cover the possibilities of running industrial chemical processes in a sustainable manner and provide an up-to-date insight into the main concerns, e.g., the use of renewable raw materials, the use of alternative energy sources in chemical processes, the design of intrinsically safe processes, microreactor and integrated reaction/ separation technologies, process intensification, waste reduction, new catalytic routes and/or solvent and process optimization.
Author: Lioz Etgar
Publisher: Springer
ISBN: 331932991X
Category : Technology & Engineering
Languages : en
Pages : 66
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Book Description
This book discusses the promising area of perovskite-based solar cells. It places particular emphasis on a highly unique perovskite solar cell structure, focusing on the special properties of hybrid organic-inorganic perovskites. As such, it offers readers sound essentials, serving as building blocks for the future development of this rapidly evolving field.
Author: Debasish Sarkar
Publisher: CRC Press
ISBN: 135138161X
Category : Science
Languages : en
Pages : 366
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Book Description
This book gives a comprehensive account on the manufacturing techniques to synchronize the desired properties of both traditional and advanced ceramics. Offers exclusive and up to date information on industrial ceramic processing equipment and approaches and discusses actual industrial practices taking a product-oriented approach It should serve as a text to answer the processing of ceramics and achieve targeted product in industrial environment.
Author: Fisher, D.J.
Publisher: Materials Research Forum LLC
ISBN: 1644900807
Category : Technology & Engineering
Languages : en
Pages : 130
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Book Description
Lead halide perovskite materials have a huge potential in solar cell technology. They offer the combined advantages of low-cost preparation and high power-conversion efficiency. The present review focusses on the following topics: Power Conversion Efficiency; Electron Transport, Hole Transport and Interface Layers; Material Preparation; Cesium-Doped Lead-Halide Perovskites; Formamidinium-Doped Lead-Halide Perovskites; Methylammonium Lead-Halide Perovskites; Hysteresis, Stability and Toxicity Problems. The book references 334 original resources and includes their direct web link for in-depth reading. Keywords: Solar Cells, Lead Halide Perovskite Materials, Cesium-Doped Lead-Halide Perovskites, Formamidinium-Doped Lead-Halide Perovskites, Methylammonium Lead-Halide Perovskites, Electron-Transport Layer, Hole-Transport Layer, Interface Layers, Hysteresis Problem, Stability Problem, Toxicity Problem.
