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Selective Catalytic Reduction Of No By Nh3 Over V2o5 Wo3 Tio2 Catalyst Promoted By Mn And Another Metal Ce Cu Or Fe
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Book Synopsis Selective Catalytic Reduction of NO by NH3 Over V2O5-WO3/TiO2 Catalyst Promoted by Mn and Another Metal (Ce, Cu Or Fe) by :
Download or read book Selective Catalytic Reduction of NO by NH3 Over V2O5-WO3/TiO2 Catalyst Promoted by Mn and Another Metal (Ce, Cu Or Fe) written by and published by . This book was released on 2008 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selective Catalytic Reduction of NOx by : Oliver Kröcher
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
Book Synopsis Environmental Functional Nanomaterials by : Qiang Wang
Download or read book Environmental Functional Nanomaterials written by Qiang Wang and published by Walter de Gruyter GmbH & Co KG. This book was released on 2019-12-02 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental Functional Nanomaterials covers the molecular structure and properties of nanomaterials used to remove refractory pollutants from industrial wastewaters and the environment with high efficiency. Insights into the innovations in the production of these new nanomaterials are provided. This book is ideal for career starters and students of materials science, environmental science, and chemistry.
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
Book Synopsis Influence of Catalyst Synthesis Method on Selective Catalytic Reduction (SCR) of NO by NH3 with V2O5-WO3/TiO2 Catalysts by :
Download or read book Influence of Catalyst Synthesis Method on Selective Catalytic Reduction (SCR) of NO by NH3 with V2O5-WO3/TiO2 Catalysts written by and published by . This book was released on 2016 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: We compared the molecular structures, surface acidity and catalytic activity for NO/NH3/O2 SCR of V2O5-WO3/TiO2 catalysts for two different synthesis methods: co-precipitation of aqueous vanadium and tungsten oxide precursors with TiO(OH)2 and by incipient wetness impregnation of the aqueous precursors on a reference crystalline TiO2 support (P25; primarily anatase phase). Bulk analysis by XRD showed that co-precipitation results in small and/or poorly ordered TiO2(anatase) particles and that VOx and WOx do not form solid solutions with the bulk titania lattice. Surface analysis of the co-precipitated catalyst by High Sensitivity-Low Energy Ion Scattering (HS-LEIS) confirms that the VOx and WOx are surface segregated for the co-precipitated catalysts. In situ Raman and IR spectroscopy revealed that the vanadium and tungsten oxide components are present as surface mono-oxo O = VO3 and O = WO4 sites on the TiO2 supports. Co-precipitation was shown for the first time to also form new mono-oxo surface VO4 and WO4 sites that appear to be anchored at surface defects of the TiO2 support. IR analysis of chemisorbed ammonia showed the presence of both surface NH3* on Lewis acid sites and surface NH4+* on Brønsted acid sites. TPSR spectroscopy demonstrated that the specific SCR kinetics was controlled by the redox surface VO4 species and that the surface kinetics was independent of TiO2 synthesis method or presence of surface WO5 sites. SCR reaction studies revealed that the surface WO5 sites possess minimal activity below ~325 °C and their primary function is to increase the adsorption capacity of ammonia. A relationship between the SCR activity and surface acidity was not found. The SCR reaction is controlled by the surface VO4 sites that initiate the reaction at ~200 °C. The co-precipitated catalysts were always more active than the corresponding impregnated catalysts. Finally, we ascribe the higher activity of the co-precipitated catalysts to the presence of the new surface WOx sites associated surface defects on the TiO2 support that increase the ammonia adsorption capacity.
Book Synopsis Plasma Catalysis by : Annemie Bogaerts
Download or read book Plasma Catalysis written by Annemie Bogaerts and published by MDPI. This book was released on 2019-04-02 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma catalysis is gaining increasing interest for various gas conversion applications, such as CO2 conversion into value-added chemicals and fuels, N2 fixation for the synthesis of NH3 or NOx, methane conversion into higher hydrocarbons or oxygenates. It is also widely used for air pollution control (e.g., VOC remediation). Plasma catalysis allows thermodynamically difficult reactions to proceed at ambient pressure and temperature, due to activation of the gas molecules by energetic electrons created in the plasma. However, plasma is very reactive but not selective, and thus a catalyst is needed to improve the selectivity. In spite of the growing interest in plasma catalysis, the underlying mechanisms of the (possible) synergy between plasma and catalyst are not yet fully understood. Indeed, plasma catalysis is quite complicated, as the plasma will affect the catalyst and vice versa. Moreover, due to the reactive plasma environment, the most suitable catalysts will probably be different from thermal catalysts. More research is needed to better understand the plasma–catalyst interactions, in order to further improve the applications.
Book Synopsis Advanced in Nanoscience and Technology by : Hai Lin Cong
Download or read book Advanced in Nanoscience and Technology written by Hai Lin Cong and published by Trans Tech Publications Ltd. This book was released on 2012-02-10 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). This work is intended to promote technologies for the development of micro-, nano- and cross-scale integration, to impart details of new micro/nano technologies, to spread relevant information and knowledge on every fields and to promote the industrialization and development of nanotechnology. The book contains 55 up-to-date articles in the areas of nanotechnology, nanomaterials, micro/nanofabrication, nanocomposites, nanoparticles, functional materials, MEMS devices and systems.
Book Synopsis Selective Catalytic Reduction of NO by NH3 with WO3-TiO2 Catalysts by :
Download or read book Selective Catalytic Reduction of NO by NH3 with WO3-TiO2 Catalysts written by and published by . This book was released on 2016 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of supported WO3/TiO2 catalysts was prepared by a new synthesis procedure involving co-precipitation of an aqueous TiO(OH)2 and (NH4)10W12O41*5H2O slurry under controlled pH conditions. The morphological properties, molecular structures, surface acidity and surface chemistry of the supported WO3/TiO2 catalysts were determined with BET, in situ Raman, in situ IR and temperature-programmed surface reaction (TPSR) spectroscopy, respectively. Isotopic 18O-16O exchange demonstrated that tungsten oxide was exclusively present as surface WOx species on the TiO2 support with mono-oxo W=O coordination. In contrast to previous studies employing impregnation synthesis that found only surface one mono-oxo O=WO4 site on TiO2, the co-precipitation procedure resulted in the formation of two distinct surface WOx species: mono-oxo O=WO4 (~1010-1017 cm-1) on low defect density patches of TiO2 and a second mono-oxo O=WO4 (~983-986 cm-1) on high defect density patches of TiO2. The concentration of the second WOx surface species increases as a function of solution pH. Both surface WOx sites, however, exhibited the same NO/NH3 SCR reactivity. The co-precipitated WO3-TiO2 catalysts synthesized in alkaline solutions exhibited enhanced performance for the NO/NH3 SCR reaction that is ascribed to the greater number of surface defects on the resulting TiO2 support. For the co-precipitated catalyst prepared at pH10, surface NH4+ species on Br nsted acid sites were found to be more reactive than surface NH3* species on Lewis acid sites for SCR of NO with NH3.
Book Synopsis Selective Catalytic Reduction of NOx Over V2O5-WO3/TiO2 Catalysts at Elevated Pressure by : Thomas Rammelt
Download or read book Selective Catalytic Reduction of NOx Over V2O5-WO3/TiO2 Catalysts at Elevated Pressure written by Thomas Rammelt and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atomic Layer Deposition for Semiconductors by : Cheol Seong Hwang
Download or read book Atomic Layer Deposition for Semiconductors written by Cheol Seong Hwang and published by Springer Science & Business Media. This book was released on 2013-10-18 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offering thorough coverage of atomic layer deposition (ALD), this book moves from basic chemistry of ALD and modeling of processes to examine ALD in memory, logic devices and machines. Reviews history, operating principles and ALD processes for each device.
Book Synopsis Selective Catalytic Reduction (SCR) of Nitric Oxide (NO) with Ammonia Over Vanadia-based and Pillared Interlayer Clay-based Catalysts by : Hyuk Jin Oh
Download or read book Selective Catalytic Reduction (SCR) of Nitric Oxide (NO) with Ammonia Over Vanadia-based and Pillared Interlayer Clay-based Catalysts written by Hyuk Jin Oh and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The selective catalytic reduction (SCR) of nitric oxide (NO) with ammonia over vanadia-based (V2O5-WO3/TiO2) and pillared interlayer clay-based (V2O5/Ti-PILC) monolithic honeycomb catalysts using a laboratory laminar-flow reactor was investigated. The experiments used a number of gas compositions to simulate different combustion gases. A Fourier transform infrared (FTIR) spectrometer was used to determine the concentrations of the product species. The major products were nitric oxide (NO), ammonia (NH3), nitrous oxide (N2O), and nitrogen dioxide (NO2). The aim was to delineate the effect of various parameters including reaction temperature, oxygen concentration, NH3-to-NO ratio, space velocity, heating area, catalyst arrangement, and vanadium coating on the removal of nitric oxide. The investigation showed that the change of the parameters significantly affected the removals of NO and NH3 species, the residual NH3 concentration (or NH3 slip), the temperature of the maximum NO reduction, and the temperature of complete NH3 conversion. The reaction temperature was increased from the ambient temperature (25°C) to 450°C. For both catalysts, high NO and NH3 removals were obtained in the presence of a small amount of oxygen, but no significant influence was observed from 0.1 to 3.0% O2. An increase in NH3-to-NO ratio increased NO reduction but decreased NH3 conversions. For V2O5-WO3/TiO2, the decrease of space velocity increased NO and NH3 removals and broadened the active temperature window (based on NO> 88% and NH3> 87%) about 50°C. An increase in heating area decreased the reaction temperature of the maximum NO reduction from 350 to 300 ʻC, and caused the active reaction temperature window (between 250 and 400 ʻC) to shift toward 50 ʻC lower reaction temperatures (between 200 and 350°C). The change of catalyst arrangements resulted slight improvement for NO and NH3 removals, therefore, the change might contribute to more gas removals. The catalyst with extra vanadium coating showed higher NO reductions and NH3 conversions than the catalyst without the extra vanadium coating.
Book Synopsis Selective Catalytic Reduction of NO by NH3 Over Supported Vanadia Catalysts by : C. E. Quincoces
Download or read book Selective Catalytic Reduction of NO by NH3 Over Supported Vanadia Catalysts written by C. E. Quincoces and published by . This book was released on 1998 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environmental Catalysis by : John N. Armor
Download or read book Environmental Catalysis written by John N. Armor and published by American Chemical Society. This book was released on 1994 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive volume on the major aspects of environmental catalysis. Focuses on NO x removal, mobile engine emission controls, power plant emissions, control of volatile organic compounds, SO x emissions, and waste minimization. Overview chapters introduce each section and provide added perspective and coverage. Includes comprehensive technical reports on automotive and diesel emission control catalysis, NO x removal, and removal of chlorinated hydrocarbons from various process streams.
Book Synopsis COMPARATIVE STUDY OF N2O FORMATION DURING THE SELECTIVE CATALYTIC REDUCTION OF NO BY NH3 IN THE PRESENCE AND ABSENCE OF O2 CONDITIONS by : Archareeyaporn Ruengthawornkul
Download or read book COMPARATIVE STUDY OF N2O FORMATION DURING THE SELECTIVE CATALYTIC REDUCTION OF NO BY NH3 IN THE PRESENCE AND ABSENCE OF O2 CONDITIONS written by Archareeyaporn Ruengthawornkul and published by . This book was released on 2014 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work investigates the formation of N2O during the SCR of NO with NH3 over V2O5/TiO2, WO3/TiO2, MoO3/TiO2, V2O5-WO3/TiO2 and V2O5-MoO3/TiO2 catalysts. All catalysts are characterized by using BET surface area measurement, XRD, FT-IR, NH3-TPD, Pyridine adsorption, and ICP-OES. The effluent gas in the SCR experimental contains 120 ppm NO, 120 ppm NH3, 30 ppm SO2, 15 vol% O2, and 15 vol% H2O, balanced with N2. The reaction is carried out in the reaction temperature 120-450°C. A gas chromatograph Shimadzu GC-2014 equipped with an ECD is used to measure the amount of NO and N2O in the effluent gas. The effect of SO2 on the formation of N2O during the SCR process over the catalysts is tested by removing SO2 from the feed gas. The effect of O2 on the formation of N2O during the SCR process over the catalysts is tested by removing O2 from the feed gas. The results show that O2 is necessary for the SCR of NO by NH3 over WO3/TiO2 and V2O5-WO3/TiO2 catalysts. The SCR of NO over V2O5/TiO2, MoO3/TiO2 and V2O5-MoO3/TiO2 catalysts can proceed in the absence of O2, but at a higher reaction temperature with a large amount of N2O form. The results demonstrate that lattice oxygen (O-2) of V2O5/TiO2, MoO3/TiO2 and V2O5-MoO3/TiO2 catalysts can participate the SCR process at the high reaction temperature. O-2 on MoO3/TiO2 and V2O5-MoO3/TiO2 catalysts is participate to increase N2O formed from the SCR process. N2O is formed from the reaction between NH3 and O2 rather than NO.
Book Synopsis Air Pollution and Greenhouse Gases by : Zhongchao Tan
Download or read book Air Pollution and Greenhouse Gases written by Zhongchao Tan and published by Springer. This book was released on 2014-11-03 with total page 499 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook discusses engineering principles relating to air pollution and greenhouse gases (GHGs); it focuses on engineering principles and designs of related devices and equipment for air emission control for a variety of industries such as energy, chemical, and transportation industries. The book aims primarily at senior undergraduate and graduate students in mechanical, chemical and/or environmental engineering departments; it can also be used as a reference book by technical staff and design engineers who are interested in and need to have technical knowledge in air pollution and GHGs. The book is motivated by recent rapid advances in air pollution and greenhouse gas emissions and their control technologies. In addition to classic topics related to air pollution, this book is also featured with emerging topics related to air pollution and GHGs. It covers recent advances in engineering approaches to the reduction of GHG emissions including, but are not limited to, green energy technologies and carbon sequestration and storage. It also introduces an emerging topic in air pollution, which is referred to as Nano Air Pollution. It is a growing concern in air pollution, but largely missing in similar books, likely because of recent rapid advances in nanotechnology has outpaced the advances in nano air pollution control.
Book Synopsis Selective Catalytic Reduction of Nitrogen Oxide by Ammonia Over V2O5/TiO2 Containing WO3 and MoO3 Catalysts by :
Download or read book Selective Catalytic Reduction of Nitrogen Oxide by Ammonia Over V2O5/TiO2 Containing WO3 and MoO3 Catalysts written by and published by . This book was released on 2011 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
