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Author : Christopher Stuart Wright
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (142 download)
Download or read book Hydrothermal Synthesis of Cerium-containing Oxides for Use in Catalysis written by Christopher Stuart Wright and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Samuel Itumo Mutinda
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.:/5 (864 download)
Download or read book Hydrothermal Synthesis of Shape/size-controlled Cerium-based Oxides written by Samuel Itumo Mutinda and published by . This book was released on 2013 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: A low energy band gap between Ce3+ and Ce4+ states in cerium oxide along with its high oxygen mobility and high oxygen storage capacity are properties that qualify it as one of the most widely used heterogeneous catalysts and catalyst oxide supports. This thesis report is an account of studies that were carried out on the synthesis and catalytic properties of pure, metal-doped and noble-metal impregnated cerium oxide nanoparticles. Our results revealed that synthesis temperature, during hydrothermal reactions, plays a critical role in controlling the shape, size, oxygen vacancy concentration, and low temperature reducibility in CeO2 nanoparticles. In addition, OH− ion concentration was found to play an important role in engineering the lattice constants and oxygen vacancy concentrations of ceria nanoparticles within the same particle morphology and synthesis temperature. Secondly, our studies demonstrated that hydrothermal synthesis is a facile one-step approach to the preparation of compositionally homogeneous Ce[subscript x]Zr[subscript 1-x]O2 (0≤x≤1) nanocrystals, in which CeO2-ZrO2 mixed oxides present a superior low-temperature oxygen release capability compared to pure CeO2. The Ce[subscript 0.5]Zr[subscript 0.5]O2 system proved to have good thermal stability up to 1000°C under reducing and oxidizing atmosphere. We have also seen that at above 1000°C, phase transformation occurs from psudocubic to cation ordered pyrochlore or tetragonal phase under reducing and oxidizing atmosphere, respectively. This method may be easily extended to other cerium-based mixed oxides or synthesis of analogous mixed oxides. Lastly, our results established that the impregnation of 1 wt. % platinum and gold on CeO2 nanorods and on nanocubes causes an enhanced reduction on their surface reduction temperatures with negligible effect on their bulk reducibility. It was also shown that both pure and impregnated CeO2 nanorods have a lower surface reduction temperature compared to that of pure and impregnated CeO2 nanocubes. We have also demonstrated that gold nanoparticles proved to have a higher catalytic performance in oxidizing molecular hydrogen at low temperatures as compared to platinum nanoparticles.
Author : Salvatore Scire
Publisher : Elsevier
ISBN 13 : 0128156627
Total Pages : 402 pages
Book Rating : 4.1/5 (281 download)
Download or read book Cerium Oxide (CeO2): Synthesis, Properties and Applications written by Salvatore Scire and published by Elsevier. This book was released on 2019-08-21 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cerium Oxide (CeO2): Synthesis, Properties and Applications provides an updated and comprehensive account of the research in the field of cerium oxide based materials. The book is divided into three main blocks that deal with its properties, synthesis and applications. Special attention is devoted to the growing number of applications of ceria based materials, including their usage in industrial and environmental catalysis and photocatalysis, energy production and storage, sensors, cosmetics, radioprotection, glass technology, pigments, stainless steel and toxicology. A brief historical introduction gives users background, and a final chapter addresses future perspectives and outlooks to stimulate future research. The book is intended for a wide audience, including students, academics and industrial researchers working in materials science, chemistry and physics. Addresses a wide range of applications of ceria-based materials, including catalysis, energy production and storage, sensors, cosmetics and toxicology Provides the fundamentals of ceria-based materials, including synthesis methods, materials properties, toxicology and surface chemistry Includes nanostructured ceria-based materials and a discussion of future prospects and outlooks
Author : Taylan Meşin
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (855 download)
Download or read book Hydrothermal Synthesis and Characterization of Single Crystalline CeO2 Nanoparticles for Catalytic Applications written by Taylan Meşin and published by . This book was released on 2012 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single crystalline cerium oxide nanoparticles were synthesized with hydrothermal method by mixing cerium nitrate[Ce(NO3)3.6H2O] aqueous solution with alkali bases CsOH and RbOH. SEM, TEM and XRD characterization methods were used in order to identify morphology. First part of the study includes the work on effect of hydrothermal parameters, such as reaction temperature, reaction time, alkali base type and concentration on particle size and morphology. It was prooved that the size of ceria nanoparticles is directly proportional with the reaction time. The reaction temperature is also an important parameter that effect the morphology of nanoparticles. At 120 oC nanoparticles form rod like structure and as time goes they start to form cubic crystals. When the alkali base and concentration was changed the results showed that higher base concentration favors the particles to form bigger structures than that of lower concentrations. In addition, optical properties of CeO2 nanoparticles were studied by using the UV-Vis and Fluorescence Spectrometry. UV-Vis Spectroscopy results show that particle size of CeO2 nanoparticles synthesized in the presence of 8M RbOH are larger than that of synthesized in presence of 8M CsOH. When the reaction time decreases the Ce3+ defect increases based on the results of Fluorescence Spectrometry results. Second part of the study includes catalytic property of CeO2 nanoparticles. Ceria nanoparticles were used as catalyst in the synthesis of flavone from 2'-hydroxychalcone. Several reaction parameters were studied in order to achieve the flavone synthesis. TLC, GC, GC-MS and NMR were used in order to monitor the results of the reactios.
Author : Alessandro Trovarelli
Publisher : World Scientific
ISBN 13 : 1848169647
Total Pages : 909 pages
Book Rating : 4.8/5 (481 download)
Download or read book Catalysis by Ceria and Related Materials written by Alessandro Trovarelli and published by World Scientific. This book was released on 2013 with total page 909 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book follows the 2002 edition of Catalysis by Ceria and Related Materials, which was the first book entirely devoted to ceria and its catalytic properties. In the ten years since the first edition a massive amount of work has been carried out in the field, and ceria has gained a prominent position in catalysis as one of the most valuable material for several applications. This second edition covers fundamental and applied aspects of the latest advances in ceria-based materials with a special focus on structural, redox and catalytic features. Special emphasis is given to nano-engineered and nano-shaped systems which are a key factor in the predictive and rational design of ceria with novel properties.In addition, the book presents recent advances in emerging and traditional large-scale applications of ceria in catalysis, such as the treatment of emissions from mobile sources (including diesel and gasoline engines). The primary readership includes catalysis and material science researchers from academy and industry and postdoctorate and graduate students in chemistry, chemical engineering and physics.
Author : Anne Elizabeth D'Achille
Publisher :
ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.:/5 (111 download)
Download or read book Synthesis and Reactivity of Fluorescent Rare-earth Doped Cerium Oxide Nanomaterials written by Anne Elizabeth D'Achille and published by . This book was released on 2019 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanomaterials based on cerium (IV) oxide, or CeO2, have been investigated due to interesting chemistry from the readily accessible Ce3+/Ce4+ transition. This transition is accompanied by a gain or loss in CeO2 oxygen and/or electrons. As a result, CeO2 has demonstrated reversible antioxidant activity and enzyme mimetic activity, and has also been used in oxygen transport, photocatalysis, and small molecule oxidation applications. Doping CeO2 with lower valent ions creates oxygen vacancies and increases the Ce3+/Ce4+ ratio within the lattice. The dopant may also contribute properties such as fluorescence or magnetism to compliment the CeO2 chemistry. This work presents the synthesis of several europium doped-CeO2 (Eu-CeO2) morphologies, the investigation into parameters controlling their size, morphology, and elemental composition. Select applications highlighting differences in the materials synthesized were also investigated. Eu-CeO2 nanorods and nanocubes were synthesized using a hydrothermal procedure. The nanorods were also annealed to enhance their Eu3+ fluorescence. An electrospinning and annealing procedure was used to synthesize nanowires. The Eu:Ce ratio for all the rods, cubes, and wires were controlled by changing the Eu3+ precursor concentration. Manipulation of the precursor concentrations provided minor dimension control of the rods, while changing of Ce3+ precursor and hydrothermal reaction time influenced the nanocube morphology. Finally, Eu-CeO2 nanotubes have been synthesized by layered deposition of Ce(OH)3 on a sacrificial ZnO nanowire array. The hydroxide was oxidized to Eu-CeO2 and the ZnO core etched to produce the nanotube morphology. The nanotube dimensions were controlled by the ZnO core, but low yield demands further optimization prior to use in the intended drug delivery applications. One synthesized, the rods, cubes, and wires were analyzed for Eu3+-contributed fluorescence. While the cubes and wires fluoresced as synthesized, the nanorods required annealing above 500 °C to fluoresce. Nanocubes were also synthesized with neodymium and ytterbium instead of europium. These cubes fluoresce at 800-1000nm, which is useful in bioimaging applications. The four materials (rods, annealed rods, cubes, and wires) were also compared for their effect on the transformation of di-hydroxyphenylalanine (L-Dopa) to eumelanin. Previous CeO2 nanoparticles have captured catechol-containing molecules by oxidation and conjugation with the -OH groups. Our Eu-CeO2 materials suppressed eumelanin-associated fluorescence by up to 60% when added to L-Dopa early in its transformation to eumelanin. The four morphologies exhibited very different activities, with higher Ce3+ concentrations and smaller crystalline domains associated with enhanced suppression of eumelanin synthesis.
Author : Muhammad Akhyar Farrukh
Publisher : BoD – Books on Demand
ISBN 13 : 9535128558
Total Pages : 176 pages
Book Rating : 4.5/5 (351 download)
Download or read book Functionalized Nanomaterials written by Muhammad Akhyar Farrukh and published by BoD – Books on Demand. This book was released on 2016-12-28 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Generally the nanometer scale covers from 1 to 100 nm while discussing the nanomaterials. Nanomaterials have very high potency and emerge with large applications piercing through all the discipline of knowledge, leading to industrial and technological growth. Nanotechnology is a multidisciplinary science that has its roots in fields such as colloidal science, device physics, and biomedical and supramolecular chemistry. The main objective of the book is to cover maximum areas focusing on synthesis, characterization with various microscopic techniques, and multiple applications. This book is divided into two sections with Non-carbon Compounds and Carbon Compounds. The synthesis, characterization, and applications of metal, metal oxides, and metal hydroxide nanoparticles are covered in the section Non-carbon Compounds, while the section Carbon Compounds focuses on the carbon nanotubes, graphite oxide, graphene oxide, etc.
Author : G. Adachi
Publisher : Springer Science & Business Media
ISBN 13 : 9781402025686
Total Pages : 278 pages
Book Rating : 4.0/5 (256 download)
Download or read book Binary Rare Earth Oxides written by G. Adachi and published by Springer Science & Business Media. This book was released on 2004-09 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Binary Rare Earth Oxides is the first book in the field of rare earth oxides that provides coverage from the basic science through to recent advances. This book introduces the unique characteristics of the binary rare earth oxides with their chemistry, physics and applications. It provides a comprehensive review of all the characteristics of rare earth oxides, essential for scientists and engineers involved with rare earths, oxides, inorganic materials, ceramics, and structures. The binary rare earth oxides bring us a variety of interesting characteristics. Understanding their fundamental mechanisms builds a bridge between solid-state chemistry and materials science. The book begins with a brief introduction to binary rare earth oxides, their physical and chemical stabilities, polymorphism, crystal structures and phase transformation and the association with current applications. The book goes on to present the band structure of the oxides using several quantum chemical calculations, which belong to a newly developed area in the binary rare earth oxides. Central to this chapter are the characterizations of electrical, magnetic and optical properties, as well as details of single crystal growth and particle preparation methods that have progressed in recent years. Later chapters concentrate on thermo-chemical properties and trace determination techniques. The final chapter contains a variety of useful applications in various fields such as phosphors, glass abrasives, automotive catalysts, fuel cells, solid electrolytes, sunscreens, iron steels, and biological materials. This book is an invaluable resource for materials scientists and solid-state physicists and chemists with an interest in rare earth oxides, as well as advanced students and graduates who require an approach to familiarize them with this field. This book provides guidance through a comprehensive review of all the characteristics of binary rare earth oxides.
Author : Sher Bahadar Khan
Publisher : BoD – Books on Demand
ISBN 13 : 1789850231
Total Pages : 123 pages
Book Rating : 4.7/5 (898 download)
Download or read book Cerium Oxide written by Sher Bahadar Khan and published by BoD – Books on Demand. This book was released on 2019-01-23 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the chemical structure and applications of CeO2. It covers the recent developments in a wide range of CeO2 applications, particularly catalysis corrosion protection, fuel cells, sensors, and UV-blocking. It also provides a concise but thorough coverage of the chemical structure and applications of CeO2. Thus, this book provides an overview of chemical structure, applications, and recent attributes of CeO2 for a broad audience, including beginners, graduate students, and specialists in both academic and industrial sectors.
Author : Jorben Gerritzen
Publisher : Nova Science Publishers
ISBN 13 : 9781685079383
Total Pages : 0 pages
Book Rating : 4.0/5 (793 download)
Download or read book Cerium Oxide written by Jorben Gerritzen and published by Nova Science Publishers. This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Cerium oxide is a pale yellow-white powder with commercial applications in optics and welding, among other domains. This book explores the synthesis, properties and applications of cerium oxide. Chapter One exposes the different types of cerium oxide nanostructures, with emphasis on the nanotubular structure, the synthesis process, and the influence of using heat treatment. Chapter Two reviews the principal synthetic methodologies used to form cerium oxide and develop its activity. Chapter Three describes the use of metal-doped cerium oxide nanoparticles for the degradation of dyes. Lastly, Chapter Four assesses the catalytic activity of cerium oxide species towards selective catalytic reduction of SO2 with CH4"--
Author : Indrajit Sinha
Publisher : BoD – Books on Demand
ISBN 13 : 1789841593
Total Pages : 170 pages
Book Rating : 4.7/5 (898 download)
Download or read book Nanocatalysts written by Indrajit Sinha and published by BoD – Books on Demand. This book was released on 2019-07-31 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanocatalysis is a topical area of research that has huge potential. It attempts to merge the advantages of heterogeneous and homogeneous catalysis. The collection of articles in this book treats the topics of specificity, activity, reusability, and stability of the catalyst and presents a compilation of articles that focuses on different aspects of these issues.
Author : Ramesh Chandra
Publisher : Bentham Science Publishers
ISBN 13 : 9815080091
Total Pages : 127 pages
Book Rating : 4.8/5 (15 download)
Download or read book Cerium-Based Materials: Synthesis, Properties and Applications written by Ramesh Chandra and published by Bentham Science Publishers. This book was released on 2023-05-23 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cerium is the most abundant metal of rare-earth elements. It can be used to make materials such as phosphors and alloys, that have applications in various applied fields (like electronics, magnetics and heterogeneous catalysis) and devices (like catalytic converters and gas mantles). Cerium-Based Materials: Synthesis, Properties and Applications presents detailed knowledge about cerium materials. Starting with the history of cerium-based materials, it gives an introduction to the synthesis of chemicals like cerium oxides and composites. This is followed by information about characterization of cerium nanoparticles and industrial applications of cerium-based materials, with a focus on catalysis, biomedical engineering and pharmaceutical chemistry. This book is an essential reference for researchers and chemical engineers who want a summary of cerium materials and its applications.
Author : Zili Wu
Publisher : Academic Press
ISBN 13 : 0128013400
Total Pages : 393 pages
Book Rating : 4.1/5 (28 download)
Download or read book Catalysis by Materials with Well-Defined Structures written by Zili Wu and published by Academic Press. This book was released on 2015-03-26 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysis by Materials with Well-Defined Structures examines the latest developments in the use of model systems in fundamental catalytic science. A team of prominent experts provides authoritative, first-hand information, helping readers better understand heterogeneous catalysis by utilizing model catalysts based on uniformly nanostructured materials. The text addresses topics and issues related to material synthesis, characterization, catalytic reactions, surface chemistry, mechanism, and theoretical modeling, and features a comprehensive review of recent advances in catalytic studies on nanomaterials with well-defined structures, including nanoshaped metals and metal oxides, nanoclusters, and single sites in the areas of heterogeneous thermal catalysis, photocatalysis, and electrocatalysis. Users will find this book to be an invaluable, authoritative source of information for both the surface scientist and the catalysis practitioner Outlines the importance of nanomaterials and their potential as catalysts Provides detailed information on synthesis and characterization of nanomaterials with well-defined structures, relating surface activity to catalytic activity Details how to establish the structure-catalysis relationship and how to reveal the surface chemistry and surface structure of catalysts Offers examples on various in situ characterization instrumental techniques Includes in-depth theoretical modeling utilizing advanced Density Functional Theory (DFT) methods
Author : Ahmet Yavuz Oral
Publisher : Springer
ISBN 13 : 3319466011
Total Pages : 258 pages
Book Rating : 4.3/5 (194 download)
Download or read book 3rd International Multidisciplinary Microscopy and Microanalysis Congress (InterM) written by Ahmet Yavuz Oral and published by Springer. This book was released on 2016-11-09 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 3rd International Multidisciplinary Microscopy Congress (InterM2015), held from 19 to 23 October 2015, focused on the latest developments concerning applications of microscopy in the biological, physical and chemical sciences at all dimensional scales, advances in instrumentation, techniques in and educational materials on microscopy. These proceedings gather 17 peer-reviewed technical papers submitted by leading academic and research institutions from nine countries and representing some of the most cutting-edge research available.
Author : Ioannis V. Yentekakis
Publisher : MDPI
ISBN 13 : 3039360361
Total Pages : 448 pages
Book Rating : 4.0/5 (393 download)
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.
Author : Craig I. Hiley
Publisher :
ISBN 13 :
Total Pages : 500 pages
Book Rating : 4.:/5 (921 download)
Download or read book New Oxides for Catalysis from Hydrothermal Synthesis written by Craig I. Hiley and published by . This book was released on 2014 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : G. Meyer
Publisher : Springer Science & Business Media
ISBN 13 : 9401137587
Total Pages : 377 pages
Book Rating : 4.4/5 (11 download)
Download or read book Synthesis of Lanthanide and Actinide Compounds written by G. Meyer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt:
