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Author : Mikaela Wallin
Publisher :
ISBN 13 :
Total Pages : 31 pages
Book Rating : 4.:/5 (186 download)
Download or read book Studies on Metal Oxide Catalysts for Selective Catalytic Reduction of NOx with NH3 written by Mikaela Wallin and published by . This book was released on 2002 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Oliver Kröcher
Publisher : MDPI
ISBN 13 : 3038973645
Total Pages : 281 pages
Book Rating : 4.0/5 (389 download)
Download or read book Selective Catalytic Reduction of NOx written by Oliver Kröcher and published by MDPI. This book was released on 2018-12-14 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Selective Catalytic Reduction of NOx" that was published in Catalysts
Author : Gregory Thomas Went
Publisher :
ISBN 13 :
Total Pages : 428 pages
Book Rating : 4.:/5 (33 download)
Download or read book Studies of Supported Vanadium Oxide Catalysts for the Selective Catalytic Reduction of Nitrogen Oxides written by Gregory Thomas Went and published by . This book was released on 1991 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. Niaei
Publisher :
ISBN 13 : 9789535107255
Total Pages : pages
Book Rating : 4.1/5 (72 download)
Download or read book Selective Catalytic Reduction of NO with Ammonia Over Nanostructure H-ZSM-5 Supported Transition Metal Oxide Catalysts written by A. Niaei and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ch. Baerlocher
Publisher : Elsevier
ISBN 13 : 0080554342
Total Pages : 405 pages
Book Rating : 4.0/5 (85 download)
Download or read book Atlas of Zeolite Framework Types written by Ch. Baerlocher and published by Elsevier. This book was released on 2007-09-12 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zeolite scientists, whether they are working in synthesis, catalysis, characterization or application development, use the Atlas of Zeolite Framework Types as a reference. It describes the main features of all of the confirmed zeolite framework structures, and gives references to the relevant primary structural literature. Since the last edition 34 more framwork types have been approved and are described in this new edition. A further new feature will be that characteristic building units will be listed for each of the framework types.Zeolites and their analogs are used as desiccants, as water softeners, as shape-selective acid catalysts, as molecular sieves, as concentrators of radioactive isotopes, as blood clotting agents, and even as additives to animal feeds. Recently, their suitability as hosts for nanometer spacing of atomic clusters has also been demonstrated. These diverse applications are a reflection of the fascinating structures of these microporous materials. Each time a new zeolite framework structure is reported, it is examined by the Structure Commission of the International Zeolite Association (IZA-SC), and if it is found to be unique and to conform to the IZA-SC's definition of a zeolite, it is assigned a 3-letter framework type code. This code is part of the official IUPAC nomenclature for microporous materials. The Atlas of Zeolite Framework Types is essentially a compilation of data for each of these confirmed framework types. These data include a stereo drawing showing the framework connectivity, features that characterize the idealized framework structure, a list of materials with this framework type, information on the type material that was used to establish the framework type, and stereo drawings of the pore openings of the type material. Clear stereo drawings of each of the framework types Description of the features of the framework type, allowing readers to quickly see if the framework type is suitable to their needs References to isotypic materials, readers can quickly identify related materials and consult the appropriate reference
Author : Gary Dair Jones
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (2 download)
Download or read book Selective Catalytic Reduction and NOx Control in Japan written by Gary Dair Jones and published by . This book was released on 1981 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Richard L. Klimisch
Publisher : Springer
ISBN 13 :
Total Pages : 360 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Catalytic Chemistry of Nitrogen Oxides written by Richard L. Klimisch and published by Springer. This book was released on 1975-09 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.
Author : Hanna Sjövall
Publisher :
ISBN 13 : 9789173853453
Total Pages : 68 pages
Book Rating : 4.8/5 (534 download)
Download or read book Selective catalytic reduction of NOx with NH3 written by Hanna Sjövall and published by . This book was released on 2009 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wenfeng Shangguan
Publisher : Springer
ISBN 13 : 9811072663
Total Pages : 138 pages
Book Rating : 4.8/5 (11 download)
Download or read book Simultaneous Catalytic Removal of Diesel Soot and NOx written by Wenfeng Shangguan and published by Springer. This book was released on 2018-06-28 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book not only explores catalysis processes in redox reactions but also proposes a potential after-treatment strategy. Summarizing the authors’ major works, it offers a guidebook for those working on environmental and industrial catalysis. It presents insights into reaction kinetics in a variety of materials and analyzes the external conditions influencing the reaction. As such it is of particular interest to engineers and scientists in the field of material chemistry, chemical engineering and automobile industry. With novel images and illustrations, it provides a new perspective for interpreting soot abatement material and understanding the reaction process and inspires scientists to design new catalysts with moderate redox capacity.
Author : Pranit Subhash Metkar
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (893 download)
Download or read book Experimental and Kinetic Modeling Studies of Selective Catalytic Reduction of NOx with NH3 on Fe- and Cu-Zeolite Monolithic Catalysts written by Pranit Subhash Metkar and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The selective catalytic reduction (SCR) of NOx with NH3 is considered to be the most promising technique for the efficient reduction of highly detrimental NOx (to N2) emitted from diesel engine vehicles. Amongst the various catalysts available for SCR, Fe- and Cu-zeolite catalysts are found to be highly stable and efficient towards maximum NOx reduction over a wide temperature range. Cu-zeolites are more active at low temperatures ( 350 oC) while Fe-zeolites are more active at high temperatures ( 400 oC). We carried out a comprehensive experimental and kinetic modeling study of key SCR reactions on Fe- and Cu-zeolite catalysts and present a detailed understanding of mass transfer limitations and kinetics and mechanistic aspects of various SCR reactions on these catalysts. Experiments carried out on monolith catalysts having different washcoat loadings, washcoat thicknesses and lengths indicate the presence of washcoat (or pore) diffusion limitations at intermediate to high temperature range in all the SCR reactions. A detailed analysis of the effect of temperature on the transitions between various controlling regimes (kinetic, washcoat diffusion and external mass transfer) is presented. Agreement in the differential kinetics studies of NO oxidation and standard SCR (NO + O2 + NH3) reactions indicates NO oxidation is the rate determining step for standard SCR. A detailed kinetic model capturing key features of all the SCR reactions is developed. This model accurately predicts the experimentally observed NOx conversions over a wide temperature range and different feed conditions. Finally, a systematic study of various SCR reactions is carried out on a combined system of Fe- and Cu-zeolite monolithic catalysts to determine if a high NOx conversion could be sustained over a wider temperature range than with individual Fe- and Cu-zeolite catalysts. Amongst various configurations, a dual-layer catalyst with a thin Fe-zeolite layer on top of a thick Cu-zeolite layer resulted in a very high NOx removal efficiency over a broad temperature range of practical interest. The kinetic model accurately captures the experimental data with a combined system of Fe- and Cu-zeolite catalysts and provides further insights into the catalyst arrangements for maximum NOx reduction efficiency.
Author : Adam Bielanski
Publisher : CRC Press
ISBN 13 : 1482293285
Total Pages : 489 pages
Book Rating : 4.4/5 (822 download)
Download or read book Oxygen in Catalysis written by Adam Bielanski and published by CRC Press. This book was released on 1990-11-29 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: A description of catalytic systems commonly used as model systems in the laboratory and as industrial catalysts in large-scale operations, and a discussion of the mechanisms operating in these reactions. Attempts to describe the elementary steps by quantum chemical methods are also shown, as are rec
Author : Di Wang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Selective Catalytic Reduction of NOx by NH3 (NH3-SCR) in Small Pore Cu-exchanged Chabazite (CHA) Catalysts written by Di Wang and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen oxides, NOx (NO+NO2), are considered significant air pollutants. Selective catalytic reduction of NOx with NH3 (NH3-SCR) is a leading technology candidate for NOx emissions control for diesel engine vehicles. Recently, the Cu-exchanged chabazite framework type zeolite with small pores, such as SAPO-34 and SSZ-13, has received a great deal of attention due to exceptional hydrothermal durability and enhanced SCR activity. I have carried out a systematic study over both Cu-SAPO-34 and Cu-SSZ-13 catalysts to elucidate the reaction mechanisms, acid properties, Cu structures, active centers and deactivation modes. First, the intrinsic mechanism of the SCR reaction over a Cu-exchanged SAPO-34 catalyst at low temperature was studied by in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), coupled with a mass spectrometer to measure inlet and outlet gas concentrations. The evolution of the surface intermediates, as well as the reactivity of NH3 with surface NOx species and NOx with surface NH3 species, was evaluated. Second, a series of SAPO-34 catalysts with various Cu loadings (ranging 0.7-3.0 wt%) was prepared by a solid state ion exchange method (SSIE). The acid properties as well as the Cu structures were characterized by XRD, NH3-TPD, UV-vis, DRIFTS and H2-TPR. Third, a SSIE method was developed to synthesize Cu-SSZ-13 catalysts with excellent NH3-SCR performance and durable hydrothermal stability. After the SSIE process, the SSZ framework structure and surface area was maintained. DRIFTS and NH3-TPD experiments provide evidence that Cu ions were successfully exchanged with Brønsted acid protons in the pores. Fourth, the hydrothermal stability of Cu-SAPO-34 and Cu-SSZ-13 was studied. Their different evolutions of zeolite framework, acidity and Cu structure during the hydrothermal aging were probed by XRD, DRIFTS and NH3-TPD. The results suggest that Cu-SAPO-34 is more resistant to hydrothermal aging in comparison to Cu-SSZ-13. Last, the SO2 poisoning effect over Cu-SAPO-34 catalyst was investigated by using in-situ DRIFTS combined with temperature programmed desorption (TPD) experiments. It was found that the low temperature deactivation mechanism involved the formation of ammonium sulfate species as well as the competitive adsorption SO2 with NOx.
Author : Isabella Nova
Publisher : Springer Science & Business Media
ISBN 13 : 1489980717
Total Pages : 715 pages
Book Rating : 4.4/5 (899 download)
Download or read book Urea-SCR Technology for deNOx After Treatment of Diesel Exhausts written by Isabella Nova and published by Springer Science & Business Media. This book was released on 2014-03-14 with total page 715 pages. Available in PDF, EPUB and Kindle. Book excerpt: Urea-SCR Technology for deNOx After Treatment of Diesel Exhausts presents a complete overview of the selective catalytic reduction of NOx by ammonia/urea. The book starts with an illustration of the technology in the framework of the current context (legislation, market, system configurations), covers the fundamental aspects of the SCR process (catalysts, chemistry, mechanism, kinetics) and analyzes its application to useful topics such as modeling of full scale monolith catalysts, control aspects, ammonia injections systems and integration with other devices for combined removal of pollutants.
Author : Hans Bosch
Publisher :
ISBN 13 : 9789090019048
Total Pages : 207 pages
Book Rating : 4.0/5 (19 download)
Download or read book The Selective Catalytic Reduction of Nitric Oxide with Ammonia written by Hans Bosch and published by . This book was released on 1987 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Magdalena Jablonska
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659617270
Total Pages : 72 pages
Book Rating : 4.6/5 (172 download)
Download or read book Selective Catalytic Ammonia Oxidation Into Nitrogen and Water Vapour written by Magdalena Jablonska and published by LAP Lambert Academic Publishing. This book was released on 2014-10-01 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: An increasing amount of ammonia slip affects DeNOx technology used to reduce nitrogen oxides emissions from power plants and other stationary sources of NOx emissions, heavy trucks, gasoline and Diesel passenger cars. The control and removal of ammonia emissions in waste streams are required. The process of the selective catalytic oxidation of ammonia into nitrogen and water vapour is one of the most promising methods for elimination of toxic ammonia from flue gases. As catalysts for the process hydrotalcite-derived mixed metal oxides were tested. The studies performed in the frame of the research were presented in four scientific papers (Catalysis Letters, Applied Catalysis B: Environmental, Journal of Thermal Analysis and Calorimetry, Chemik). Mixed metal oxides have been found to be active, selective to nitrogen and stable in ammonia oxidation. Their activity and selectivity strongly depend on chemical and phase composition and their redox properties. Optimum composition of the catalysts guaranteeing high catalytic performance was proposed. The internal SCR (i-SCR) mechanism was investigated for the reaction performed over the studied catalysts.
Author : Christian Hess
Publisher : Royal Society of Chemistry
ISBN 13 : 1847559875
Total Pages : 453 pages
Book Rating : 4.8/5 (475 download)
Download or read book Nanostructured Catalysts written by Christian Hess and published by Royal Society of Chemistry. This book was released on 2011-07-22 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book gives a comprehensive up-to-date summary of the existing information on the structural/electronic properties, chemistry and catalytic properties of vanadium and molybdenum containing catalysts. It discusses the importance of nanoscience for the controlled synthesis of catalysts with functional properties and introduces the necessary background regarding surface properties and preparation techniques, leading from a textbook level to the current state of knowledge. Then follows an extensive survey and analysis of the existing open and patent literature - an essential knowledge source for the development of the new generation of partial oxidation catalysts. Important examples from current research on partial oxidation reactions are reviewed from experts in the field. The next chapter discusses the importance of 2- and 3-dimensional model systems for a fundamental understanding of the structure of transition metal oxide catalysts and its correlation to reactivity. Finally, an outlook on research opportunities within the area of partial oxidation reactions is presented.
Author : Murtadha Almousawi
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)
Download or read book Highly Dispersed Transition Metal Oxide Catalysts Achieved on Hydroxyl-rich Supports for Environmental Catalysis written by Murtadha Almousawi and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Air pollution is one of the most substantial challenges of our era. It is a major contributor to climate change and a significant health hazard contributing to increased mortality or severe illness. Environmental catalysis is one of the most sustainable and effective solutions for reducing the emissions of undesirable pollutants in the atmosphere. Nonetheless, the effectiveness of pollutant removal greatly hinges upon the catalyst employed, necessitating the urgent development of exceptionally efficient catalysts. In comparison to the commonly employed precious metal catalysts, there has been a notable surge of interest in non-noble transition metal catalysts, such as copper and nickel-based catalysts. This interest is primarily due to their abundant availability, lower cost, and their considerable activities in environmental related reactions that are comparable to those of noble metal catalysts. However, there is still a pressing need to significantly enhance their low-temperature activity to meet application requirements. Increasing the metal dispersion to create more active sites and establishing a strong interaction between metals and supports are effective strategies to improve the catalytic performance of supported metal catalysts. However, achieving these improvements using simple and scalable preparation methods has posed a considerable challenge in the material science and environmental catalysis field. In this work, using hydroxyl-rich (OH-rich) CeO2 and ZrO2 as supports and a facile incipient wetness impregnation (IWI) method, we report the successful preparation of three sets of catalysts, including CuO/CeO2, CuO/ZrO2, and Ni/CeO2, with high metal dispersion and enhanced metal-support interactions. Our findings show that these catalysts prepared using OH-rich supports exhibited superior catalytic performance in environmental-related reactions, including CO oxidation, NO reduction by CO, selective catalytic oxidation of NH3 (NH3-SCO), and dry reforming of methane (DRM), respectively. Using various experimental techniques, including X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), N2 physisorption, X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS), the effect of hydroxyls on Ce(OH)x and Zr(OH)x supports on the physicochemical properties of the catalysts was characterized in detail. Additionally, the structure-activity relationship and reaction mechanism on these newly developed catalysts were revealed. This study showcases the utilization of OH-rich supports to improve metal dispersion and strengthen the metal-support interaction, thereby improving the catalytic performance of supported transition metal catalysts. This research suggests that utilizing OH-rich supports holds great promise as an approach to designing highly efficient catalysts for important environmental catalysis applications.
