Influence of Catalyst Synthesis Method on Selective Catalytic Reduction (SCR) of NO by NH3 with V2O5-WO3/TiO2 Catalysts

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Total Pages : 10 pages
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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.

Selective Catalytic Reduction of NO by NH3 with WO3-TiO2 Catalysts

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Total Pages : 11 pages
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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.

Selective Catalytic Reduction of NOx

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Publisher : MDPI
ISBN 13 : 3038973645
Total Pages : 281 pages
Book Rating : 4.0/5 (389 download)

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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

Nanotechnology in Environmental Science, 2 Volumes

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Publisher : John Wiley & Sons
ISBN 13 : 352734294X
Total Pages : 898 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Nanotechnology in Environmental Science, 2 Volumes by : Chaudhery Mustansar Hussain

Download or read book Nanotechnology in Environmental Science, 2 Volumes written by Chaudhery Mustansar Hussain and published by John Wiley & Sons. This book was released on 2018-05-29 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt: An overview of the current state of nanotechnology-based devices with applications in environmental science, focusing on nanomaterials and polymer nanocomposites. The handbook pays special attention to those nanotechnology-based approaches that promise easier, faster and cheaper processes in environmental monitoring and remediation. Furthermore, it presents up-to-date information on the economics, toxicity and regulations related to nanotechnology in detail. The book closes with a look at the role of nanotechnology for a green and sustainable future. With its coverage of existing and soon-to-be-realized devices this is an indispensable reference for both academic and corporate R&D.

Springer Handbook of Advanced Catalyst Characterization

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Publisher : Springer Nature
ISBN 13 : 3031071255
Total Pages : 1109 pages
Book Rating : 4.0/5 (31 download)

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Book Synopsis Springer Handbook of Advanced Catalyst Characterization by : Israel E. Wachs

Download or read book Springer Handbook of Advanced Catalyst Characterization written by Israel E. Wachs and published by Springer Nature. This book was released on 2023-06-12 with total page 1109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Co-edited by world-renowned scientists in the field of catalysis, this book contains the cutting-edge in situ and operando spectroscopy characterization techniques operating under reaction conditions to determine a materials’ bulk, surface, and solution complex and their applications in the field of catalysis with emphasis on solid catalysts in powder form since such catalyst are relevant for industrial applications. The handbook covers from widely-used to cutting-edge techniques. The handbook is written for a broad audience of students and professionals who want to pursue the full capabilities available by the current state-of-the-art in characterization to fully understand how their catalysts really operate and guide the rational design of advanced catalysts. Individuals involved in catalysis research will be interested in this handbook because it contains a catalogue of cutting-edge methods employed in characterization of catalysts. These techniques find wide use in applications such as petroleum refining, chemical manufacture, natural gas conversion, pollution control, transportation, power generation, pharmaceuticals and food processing. fdsfds

Environmental Impact IV

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Publisher : WIT Press
ISBN 13 : 178466281X
Total Pages : 521 pages
Book Rating : 4.7/5 (846 download)

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Book Synopsis Environmental Impact IV by : J. Casares

Download or read book Environmental Impact IV written by J. Casares and published by WIT Press. This book was released on 2018-10-23 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprising a collection of papers from the 4th International Conference on Environmental and Economic Impact on Sustainable Development, the research studies included in this book consider the impact of economic constraints on the environment, taking into account the social aspects as well as the over-use of natural resources. The papers examine issues related to whether some forms of development are compatible with environmental protection, particularly in cases of possible serious contamination and toxicity. Uncontrolled development can result in damage to the environment in terms of the release of toxic substances and hazardous waste. Addressing problems of great importance, this book examines more constructive and progressive approaches to ensure sustainability. A major motivation is to learn from past failure, to avoid repeating similar mistakes, while attempting to prevent emerging threats to environmental and ecological systems. Fundamental to these concepts are the analysis of the inherent risk and the development of appropriate strategies.

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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ISBN 13 :
Total Pages : 174 pages
Book Rating : 4.:/5 (921 download)

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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:

Catalysts Deactivation, Poisoning and Regeneration

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Publisher : MDPI
ISBN 13 : 3039215469
Total Pages : 254 pages
Book Rating : 4.0/5 (392 download)

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Book Synopsis Catalysts Deactivation, Poisoning and Regeneration by : Luciana Lisi

Download or read book Catalysts Deactivation, Poisoning and Regeneration written by Luciana Lisi and published by MDPI. This book was released on 2019-10-01 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalyst lifetime represents one of the most crucial economic aspects in industrial catalytic processes, due to costly shutdowns, catalyst replacements, and proper disposal of spent materials. Not surprisingly, there is considerable motivation to understand and treat catalyst deactivation, poisoning, and regeneration, which causes this research topic to continue to grow. The complexity of catalyst poisoning obviously increases along with the increasing use of biomass/waste-derived/residual feedstocks and with requirements for cleaner and novel sustainable processes. This book collects 15 research papers providing insights into several scientific and technical aspects of catalyst poisoning and deactivation, proposing more tolerant catalyst formulations, and exploring possible regeneration strategies.

Comprehensive Energy Systems

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Publisher : Elsevier
ISBN 13 : 0128149256
Total Pages : 5543 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Comprehensive Energy Systems by : Ibrahim Dincer

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Challenges of Power Engineering and Environment

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Publisher : Springer Science & Business Media
ISBN 13 : 3540766944
Total Pages : 1432 pages
Book Rating : 4.5/5 (47 download)

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Book Synopsis Challenges of Power Engineering and Environment by : Ke-fa Cen

Download or read book Challenges of Power Engineering and Environment written by Ke-fa Cen and published by Springer Science & Business Media. This book was released on 2009-03-27 with total page 1432 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the proceedings of the International Conference on Power Engineering-2007. The fields of this book include power engineering and relevant environmental issues. The recent technological advances in power engineering and related areas are introduced. This book is valuable for researchers, engineers and students majoring in power engineering.

Selective Catalytic Reduction (SCR) of Nitric Oxide (NO) with Ammonia Over Vanadia-based and Pillared Interlayer Clay-based Catalysts

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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.

Structured Catalysts and Reactors

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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

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Advanced Technologies for Solid, Liquid, and Gas Waste Treatment

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Publisher : CRC Press
ISBN 13 : 100085454X
Total Pages : 328 pages
Book Rating : 4.0/5 (8 download)

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Book Synopsis Advanced Technologies for Solid, Liquid, and Gas Waste Treatment by : Saleh Al Arni

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COMPARATIVE STUDY OF N2O FORMATION DURING THE SELECTIVE CATALYTIC REDUCTION OF NO BY NH3 IN THE PRESENCE AND ABSENCE OF O2 CONDITIONS

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ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (13 download)

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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.

Effect of Acidity and Basicity on V2O5/TiO2 Catalyst for Selective Catalytic Reduction of No with NH3

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ISBN 13 : 9789743315992
Total Pages : 364 pages
Book Rating : 4.3/5 (159 download)

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Book Synopsis Effect of Acidity and Basicity on V2O5/TiO2 Catalyst for Selective Catalytic Reduction of No with NH3 by : Pawinee Sintarako

Download or read book Effect of Acidity and Basicity on V2O5/TiO2 Catalyst for Selective Catalytic Reduction of No with NH3 written by Pawinee Sintarako and published by . This book was released on 1990 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Superior Catalysts for Selective Catalytic Reduction of Nitric Oxide. Quarterly Technical Progress Report, 1 January 1994--31 March 1994

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ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (685 download)

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Book Synopsis Superior Catalysts for Selective Catalytic Reduction of Nitric Oxide. Quarterly Technical Progress Report, 1 January 1994--31 March 1994 by :

Download or read book Superior Catalysts for Selective Catalytic Reduction of Nitric Oxide. Quarterly Technical Progress Report, 1 January 1994--31 March 1994 written by and published by . This book was released on 1994 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past quarter, progress has been made in four tasks as summarized below: Task 1: A delaminated Fe2O3 pillared clay was synthesized and carefully characterized. The chemical composition was measured by ICP atomic emission spectrometry. The structural changes in the clay as well as the iron oxide particle sizes were characterized by X-ray diffraction techniques. Task 2: The Selective Catalytic Reduction (SCR, i.e., NO reduction with NH3) activities of the delaminated pillared clay were tested and compared with four other most active SCR catalysts: a commercial V2O5 + WO3/TiO2 catalyst, a Fe2O3-pillared clay, and two supported Fe2O3 catalysts (on Al2O3 and TiO2). The delaminated Fe2O3 pillared clay exhibited the highest SCR activities. Catalyst stability test showed that the delaminated sample was also stable. Task 3: To further increase the SCR activity of the delaminated pillared clay, Cr2O3 was doped as a promoter by incipient wetness. Task 4: Deactivation effects of SO2 and H2O on the SCR activities of the delaminated Fe2O3 pillared clay were studied, and compared with other SCR catalysts. The delaminated clay catalyst showed the least deactivation.

Scientific and Technical Aerospace Reports

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ISBN 13 :
Total Pages : 602 pages
Book Rating : 4.:/5 (3 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.