Download or read book DOPING OF CeO2 IN V2O5 TiO2 CATALYST FOR LOW TEMPERATURE SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDE BY AMMONIA written by Warawut Waiwasa and published by . This book was released on 2014 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research investigated the selective catalytic reduction of NO by NH3 over V2O5-CeO2/TiO2 catalyst at low temperature. Formation of nitrogen oxide from the ammonia oxidation reaction and SCR reaction was also investigated. Titanium dioxide support was prepared by a sol-gel method. Then vanadium and cerium were deposited via an incipient wetness impregnation method. The amounts of vanadium and cerium in the catalyst ranged from 1 to 7%wt and 5 to 30%wt, respectively. The catalysts were characterized by N2 physisorption, ICP-OES, XRD and NH3-TPD techniques. The testing of SCR activity of the catalyst was carried out in a tubular reactor at a temperature in the range of 120-450oC. From the result, the catalyst containing 5 %wt. V2O5, 30 %wt. CeO2 showed superior SCR activity at low temperature and reached the highest activity at 250oC. The addition of CeO2 increased the specific surface area and the total acid site of catalyst, resulting in high catalytic activity. The extent of ammonia oxidation increased as the reaction temperature and the vanadium content in catalysts increased. Addition of cerium to catalyst inhibited ammonia oxidation reaction and retained the SCR activity at high temperature. Furthermore, the addition of cerium oxide to the V2O5-TiO2 catalyst yielded SCR catalysts an excellent resist to water vapor and sulfur dioxide under our test conditions.
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
Download or read book EFFECT OF SILVER AND COPPER OXIDES DOPING ON V2O5 WO3 TiO2 CATALYST FOR LOW TEMPERATURE SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDE BY AMMONIA written by Natthakorn Jirathanasin and published by . This book was released on 2014 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research investigated effect of silver and copper oxides doping on V2O5-WO3/TiO2 catalysts, prepared by impregnation method, for selective catalytic reduction of NOX by ammonia at low temperature. The amounts of Ag2O and Cu2O were varied in ranged of 2%wt to 6%wt, while the amounts of V2O5 and WO3 in the catalysts were fixed at 3%wt. and 7%wt., respectively. TiO2 support was prepared by sol-gel method. All studied catalysts were characterized by diverse techniques such as N2-physisorption, ICP-OES, XRD and NH3-TPD. The catalytic activity testing of NH3-SCR was measured by gas chromatography. Reaction temperature was varied from 120 to 400°C. The addition of silver oxide influenced decreasing performance of the catalyst. In contrast, the addition of copper oxide enhanced the catalytic activity, especially, the copper oxide containing in 2 and 6 %wt. catalyst were observed. From the results, explicit trends in two different temperature regions was occurred in term of copper oxide loading. With 2%wt.Cu2O loading, catalytic activity increased at high temperature, while catalytic activity of 6%wt.Cu2O loading enhanced at low temperature.
Download or read book Emissions Control Catalysis written by Ioannis V. Yentekakis and published by MDPI. This book was released on 2020-06-18 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The important advances achieved over the past years in all technological directions (industry, energy, and health) contributing to human well-being are unfortunately, in many cases, accompanied by a threat to the environment, with photochemical smog, stratospheric ozone depletion, acid rain, global warming, and finally climate change being the most well-known major issues. These are the results of a variety of pollutants emitted through these human activities. The indications show that we are already at a tipping point that might lead to non-linear and sudden environmental change on a global scale. Aiming to tackle these adverse effects in an attempt to mitigate any damage that has already occurred and to ensure that we are heading toward a cleaner (green) and sustainable future, scientists around the world are developing tools and techniques to understand, monitor, protect, and improve the environment. Emissions control catalysis is continuously advancing, providing novel, multifunctional, and optimally promoted using a variety of methods, nano-structured catalytic materials, and strategies (e.g., energy chemicals recycling, cyclic economy) that enable us to effectively control emissions, either of mobile or stationary sources, improving the quality of air (outdoor and indoor) and water and the energy economy. Representative cases include the abatement and/or recycling of CO2, CO, NOx, N2O, NH3, CH4, higher hydrocarbons, volatile organic compounds (VOCs), particulate matter, and specific industrial emissions (e.g., SOx, H2S, dioxins aromatics, and biogas). The “Emissions Control Catalysis” Special Issue has succeeded in collecting 22 high-quality contributions, included in this MDPI open access book, covering recent research progress in a variety of fields relevant to the above topics and/or applications, mainly on: (i) NOx catalytic reduction from cars (i.e., TWC) and industry (SCR) emissions; (ii) CO, CH4, and other hydrocarbons removal, and (iii) CO2 capture/recirculation combining emissions control with added-value chemicals production.
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.
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.
Download or read book Advanced Technologies for Solid Liquid and Gas Waste Treatment written by Saleh Al Arni and published by CRC Press. This book was released on 2023-04-05 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Technologies for Solid, Liquid, and Gas Waste Treatment presents the potential of using advanced and emerging technologies to effectively treat waste. This book uniquely addresses treatment techniques for waste in all three phases, solid, liquid, and gas, with the goals of mitigating negative impacts of waste and producing valued-added products, such as biogas and fertilizer, as well as the use of artificial intelligence in the field. • Covers a wide range of advanced and emerging treatment technologies such as photocatalysis processing, adsorptive membranes, pyrolysis, advanced oxidation process, electrocoagulation, composting technologies, etc. • Addresses issues associated with wastes in different phases. • Discusses the pros and cons of treatment technologies for handling different wastes produced by different industrial processes, such as agricultural biomass, industrial/domestic solid wastes, wastewater, and hazardous gas. • Includes application of artificial intelligence in treatment of electronic waste. This book will appeal to chemical, civil, and environmental engineers working on waste treatment, waste valorization, and pollution control.
Download or read book Nanotechnology in the Automotive Industry written by Huaihe Song and published by Elsevier. This book was released on 2022-04-10 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology in the Automotive Industry explores how nanotechnology and nanomaterials are used to enhance the performance of materials and devices for automotive application by fabricating nano-alloys, nanocomposites, nano coatings, nanodevices, nanocatalysts and nanosensors. Consisting of 36 chapters in 6 parts, this new volume in the Micro and Nano Technologies series is for materials scientists, nanotechnologists and automotive engineers working with nanotechnology and nanomaterials for automotive applications. Nanotechnology is seen as one of the core technologies for the future automotive industry to sustain competitiveness. The benefits that nanotechnology brings to the automotive sector include stronger and lighter materials for increased safety and reduced fuel consumption, improved engine performance and fuel consumption for gasoline powered vehicles due to nanocatalysts, fuel additives and lubricants, and more. - Discusses various approaches and techniques such as nanoalloys, nanocomposites, nanocoatings, nanodevices, nanocatalysts and nanosensors used in modern vehicles - Presents the challenges and future of automotive materials - Explores how nanotechnology and nanomaterials are used to enhance the performance of materials and devices for automotive applications
Download or read book Advances in Nano and Biochemistry written by Pranay Pradeep Morajkar and published by Elsevier. This book was released on 2023-05-23 with total page 619 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Nano and Biochemistry: Environmental and Biomedical Applications gives insights into this advanced interdisciplinary science that encompasses the principles of physics and physical chemistry for the investigation of various processes and problems in biological systems. The book is a concise culmination of biophysical chemistry knowledge acquired through core concepts and advanced technologies for addressing emerging challenges in environmental and biomedical applications. Sections cover early diagnostic techniques and accurate treatment strategies using bioinspired, sustainable technologies, including nanomaterials, nanoenzymes, biopolymers, electrochemical biomolecule sensors, biocompatible magnetic nanomaterials, quantum dots and hybrid structures, and DNA nanotechnology. Other sections discuss advanced technologies for sensing and remedying environmental pollutants, including but not limited to, photocatalytic oxidations, gum polysaccharides based nanostructured materials, bio-inspired and biocompatible nanomaterials, hydrogel nanocomposites, and contemporary enzymes and nanozymes based?technologies. Ultimately, the state-of-the-art chapters in this book will empower researchers to combine two complementary elements - chemical analysis use and biomedical applications. - Provides the fundamental concepts of biophysical chemistry and emerging technologies to solve environmental and biomedical problems - Describes the latest breakthrough research in biophysical chemistry and its applications to better understand biological systems - Supports development of the latest disease diagnostic and treatment technologies - Includes advances in physical chemistry and biology for the monitoring and remediation of environmental pollutants
Download or read book Low Temperature Selective Catalytic Reduction with NH3 over MnOx CeO2 Catalysts Supported on Nano Tetragonal Zirconia written by and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Development and Characterization of Mixed Oxide Catalysts for the Selective Catlytic Reduction of Nitric Oxide from Stationary Sources Using Amonnia written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Seven first row transition metals were deposited on various commercial TiO2, SiO2, and Al2 O3 supports to create mono- and bimetallic catalysts that were compared in the selective catalytic reduction of nitric oxide using ammonia at low temperatures ranging from 373-523 K. The catalyst with the highest activity both in the absence and presence of water in the feed was 20 wt.% Mn/Hombikat TiO2 synthesized from a nitrate precursor and calcined below 673 K. Under those conditions, it was capable of achieving 100% NO conversion at 393 K. Numerous surface characterization techniques were used to identify the surface properties that result in highly active and selective low temperature SCR catalysts. The deposition of manganese as MnO2, the ease of reducibility of the metal oxide, and the symmetric deformation of ammonia coordinated to Lewis acid sites at 1167 cm−1, were all found to be important for good catalytic performance. No synergistic effects were observed from combinations of the three most active transition metals. However, MnO x -NiO/TiO2 had an extended lifetime relative to MnO x /TiO2 in feeds containing SO2 . The extensive data collected from in-situ FTIR experiments in the presence of NO and NH 3 were used to propose a reaction mechanism for MnO x /TiO2 that begins with the coordination of NH3 over Mn4 species and proceeds through the formation of bridged nitrates. A combination of potentiometric titrations and UV/Vis spectroscopy were used to quantify the reduction of V5 to V4 after the addition of oxalic acid as the solution is aged. After approximately four hours, the aging vanadium oxalate solution reaches steady state, and the final distribution of the vanadium present is 89% V+4 and 11% V+5 . TiO2 supported monolayer catalysts synthesized from the aged (V+4) vanadium oxalate solution consistently outperformed catalysts made from freshly prepared (V+5) vanadium oxalate solutions. Surface characterization revealed that surface acid sites increase in strength and vanadia reduces more easily in catalysts synthesized from aged vanadium oxalate solutions, which enhances reaction mechanism depends upon acid sites and redox operation.
Download or read book Noble Metal And Base Metal Ion Substituted Ceo2 And Tio2 written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent times, as regulations and legislations for exhaust treatment have become more stringent, a major concern in the arena of environmental catalysis is to find new efficient and economical exhaust treatment catalysts. Chapter 1 is a review of the current status of various NOx abatement techniques and understanding the role of "auto-exhaust catalysts" involved therein. Chapter 2 presents the studies on synthesis of ionically substituted precious metal ions like Pd2+, Pt2+ and Rh3+ in CeO2 matrix and their comparative three-way catalytic performances for NO reduction by CO, as well as CO and hydrocarbon oxidation. Ce0.98Pd0.02O2-d showed better catalytic activity than ionically dispersed Pt or Rh in CeO2. The study in Chapter 3 aims at synthesizing 1 atom% Pd2+ ion in TiO2 in the form of Ti0.99Pd0.01O2-d with oxide ion vacancy. A bi-functional reaction mechanism for CO oxidation by O2 and NO reduction by CO was proposed. For NO reduction in presence of CO, the model based on competitive adsorption of NO and CO on Pd2+, NO chemisorption and dissociation on oxide ion vacancy fits the experimental data. The rate parameters obtained from the model indicates that the reactions are much faster over this catalyst compared to other catalysts reported in the literature. In Chapter 4 we present catalytic reduction of NO by H2 over precious metal substituted TiO2 (Ti0.99M0.01O2-d, where M = Ru, Rh, Pd, Pt) catalysts. The rate of NO reduction by H2 depends on the reducibility of the catalysts. Chapter 5 presents the studies on reduction of NO by NH3 in presence of excess oxygen. 10 atom % of first row transition metal ions (Ti0.9M0.1O2-d, where M = Cr, Mn, Fe, Co and Cu) were substituted in anatase TiO2 and TPD study showed that the Lewis and Bronsted acid sites are adsorption sites for NH3, whereas NO is found to dissociatively chemisorbed in oxide ion vacancies. The mechanism of the low temperature catalytic activity of the SCR and the selectivity of the products were stu.
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:
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.
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.
Download or read book Solid state NMR Studies of V2O5 TiO2 Catalysts for the Selective Catalytic Reduction of NOx with Ammonia written by Danica A. Nowosielski and published by . This book was released on 2001 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
