Download or read book Synthesis of Titanate Nanotubes and Their Applications as Pd Catalyst Support written by and published by . This book was released on 2010 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this research, titanate nanotubes and nanowires were synthesized by hydrothermal method from a spherical shape commercial TiO2. The effects of quenching, reaction temperature, and annealing on the formation and morphology of the titanate were investigated. Titanate nanotubes with high BET surface area were synthesized at 150oC. The titanate nanotubes were transformed to titanate nanowires when the reaction temperature was increased to 200oC. After annealing at 600 oC, the titanate nanotubes transformed back into anatase TiO2 whereas annealing of the titanate nanowires resulted in metastable form TiO2 under similar conditions. The use of titanate nanotubes as Pd catalyst support resulted in higher catalytic performance in the liquid phase selective hydrogenation of 1-heptyne than the Pd catalysts supported on titanate nanowire and commercial titania. The titanate nanotubes supported Pd nanoparticles synthesized from reduction by solvent method exhibited higher conversion of 1-heptyne than those prepared by impregnation method. While the hydrogenation rate increased with increasing Pd dispersion, the selectivity to 1-heptene depended largely on the nature of TiO2 support and/or the interaction of Pd and titania support.
Download or read book Titanate and Titania Nanotubes written by Dmitry V. Bavykin and published by Royal Society of Chemistry. This book was released on 2010 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: This exciting new book is a unique compilation of data from a wide range of chemical and spectroscopic instrumentation and the integration of nanostructure characterisation drawn from physical, chemical, electrochemical, spectroscopic and electron microscopic measurements. It fills a gap in the current nanomaterials literature by documenting the latest research from scientific journals and patent literature to provide a concise yet balanced and integrated treatment of an interesting topic: titanium oxide nanostructures within the emerging fashionable area of nanomaterials. Of particular interest are the following key chapters: * Modification and Coating Techniques - provides a unique summary and discussion of available techniques to coat surfaces with nanostructured materials * Chemical Properties - relates structure to surface chemistry and hence applications * Structural and Physical Properties - reviews the relationship between nanostructure and physical properties providing a basis for the rationalisation of applications The book, a valuable reference point, is aimed at professionals, postgraduates and industrial research workers in nanomaterials. Readers will gain a knowledge of the methods for synthesising nanomaterials as well as an understanding of their structure and resulting physical characteristics and a knowledge of their (existing and potential) applications.
Download or read book Nitrogen doped Carbon Nanotubes written by Lucy Mudiwo Ombaka and published by . This book was released on 2015 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sustainable Catalytic Production of Bio Based Heteroatom Containing Compounds Volume II written by Hu Li and published by Frontiers Media SA. This book was released on 2022-10-14 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Synthesis of Solid Supported Palladium Nanoparticles written by Kendra W. Brinkley and published by . This book was released on 2015 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysis is one of the pillars of the chemical industry. While the use of catalyst is typically recognized in the automobile industry, their impact is more widespread as; catalysts are used in the synthesis of 80% of the US commercial chemicals. Despite the improved selectivity provided by catalyst, process inefficiencies still threaten the sustainability of a number of synthesis methods, especially in the pharmaceutical industry. Recyclable solid supported catalysts offer a unique opportunity to address these inefficiencies. Such systems coupled with continuous synthesis techniques, have the potential to significantly reduce the waste to desired product ratio (E-factor) of the production techniques. This research focuses developing sustainable processes to synthesize organic molecules by using continuous synthesis methods. In doing so, solid supported metal catalyst systems were identified, developed, and implemented to assist in the formation of carbon-carbon bonds. Newly developed systems, which utilized metal nanoparticles, showed reactivity and recyclability, comparable to commercially available catalyst. Nanoparticles are emerging as useful materials in a wide variety of applications including catalysis. These applications include pharmaceutical processes by which complex and useful organic molecules can be prepared. As such, an effective and scalable synthesis method is required for the preparation of nanoparticle catalysts with significant control of the particle size, uniform dispersion, and even distribution of nanoparticles when deposited on the surface of a solid support. This project describes the production of palladium nanoparticles on a variety of solid supports and the evaluation of these nanoparticles for cross coupling reactions. This report highlights novel synthesis techniques used in the formation of palladium nanoparticles using traditional batch reactions. The procedures developed for the batch formation of palladium nanoparticles on different solid supports, such as graphene and carbon nanotubes, are initially described. The major drawbacks of these methods are discussed, including limited scalability, variation of nanoparticle characteristics from batch to batch, and technical challenges associated with efficient heating of samples. Furthermore, the necessary conditions and critical parameters to convert the batch synthesis of solid supported palladium nanoparticles to a continuous flow process are presented. This strategy not only alleviates the challenges associated with the robust preparation of the material and the limitations of scalability, but also showcases a new continuous reactor capable of efficient and direct heating of the reaction mixture under microwave irradiation. This strategy was further used in the synthesis of zinc oxide nanoparticles. Particles synthesized using this strategy as well as traditional synthesis methods, were evaluated in the context industrially relevant applications.
Download or read book Solvent Free Methods in Nanocatalysis written by Rafael Luque and published by John Wiley & Sons. This book was released on 2023-04-10 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solvent-Free Methods in Nanocatalysis Discover solvent-free approaches for the synthesis of nanocatalysts as well as various catalytic transformations in this unique one-stop resource Solvent-free methods have attracted wide attention in organic synthesis and catalysis as a promising approach towards “greener” and more sustainable chemical transformations. In this regard, nanocatalysis has seen particular growth in recent years. Solvent-Free Methods in Nanocatalysis gives an in-depth overview of nanocatalysts and their catalytic applications using solvent-free methods. After a brief introduction, it covers various synthetic techniques for the preparation of nanocatalysts and supports using solvent-free methods, e.g. ball-milling, microwave- and plasma-assisted methods. The book discusses in detail different catalyst classes, such as metal oxides, doped and functionalized nanocarbons, as well as nitride- and silica-based materials to help researchers to understand the efficiency and nature of these catalysts/supports based on their chemical structure. In the book readers will also find: A brief account of the history, challenges, and recent advances in the field Detailed discussion of advantages and disadvantages of solvent-free techniques for nanocatalyst preparation Treatment of important solvent- and catalyst-free organic transformations (i.e. oxidation, coupling and multicomponent reactions) A chapter on supported ionic liquids for solvent-free catalysis Written by leading researchers in the field, Solvent-Free Methods in Nanocatalysis is a useful reference for researchers and students working in organic synthesis, catalysis, and nanomaterials science.
Download or read book Issues in Chemistry and General Chemical Research 2013 Edition written by and published by ScholarlyEditions. This book was released on 2013-05-01 with total page 1232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Chemistry and General Chemical Research: 2013 Edition is a ScholarlyEditions™ book that delivers timely, authoritative, and comprehensive information about Chirality. The editors have built Issues in Chemistry and General Chemical Research: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Chirality in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Chemistry and General Chemical Research: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Download or read book Synthesis of Carbon Nanotube supported Catalytic Nanoparticles and Their Applications in Catalysis written by Horng-Bin Pan and published by . This book was released on 2011 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fine Rh nanoparticles can be deposited uniformly on surfaces of carboxylate functionalized MWNTs using the one-pot sonochemical method. The CNT-supported Rh nanoparticles show remarkably high catalytic active and are reusable for hydrogenation of arenes at room temperature. Complete ring saturation of polycyclic aromatic hydrocarbons (PAHs) can be achieved under mild hydrogenation conditions using the MWNTs catalyst that can not be done by commercially available Rh nanocatalysts (Rh- Escat 3401 ). This technique also provides a simple and rapid way of making Rh nanoparticles of different size, which allows us to study particle size effects on catalysis. Furthermore, we extended the sonochemical method to synthesize well-dispersed Pt-Rh alloy bimetallic nanoparticles on sidewalls of CNTs and studied the potentially improved activity (synergistic effect) for room temperature catalytic hydrogenation of neat benzene, neat alkylbenzenes, and PAHs.
Download or read book Metal Nanoparticles for Catalysis written by Franklin Tao and published by Royal Society of Chemistry. This book was released on 2014-06-12 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysis is a central topic in chemical transformation and energy conversion. Thanks to the spectacular achievements of colloidal chemistry and the synthesis of nanomaterials over the last two decades, there have also been significant advances in nanoparticle catalysis. Catalysis on different metal nanostructures with well-defined structures and composition has been extensively studied. Metal nanocrystals synthesized with colloidal chemistry exhibit different catalytic performances in contrast to metal nanoparticles prepared with impregnation or deposition precipitation. Additionally, theoretical approaches in predicting catalysis performance and understanding catalytic mechanism on these metal nanocatalysts have made significant progress. Metal Nanoparticles for Catalysis is a comprehensive text on catalysis on Nanoparticles, looking at both their synthesis and applications. Chapter topics include nanoreactor catalysis; Pd nanoparticles in C-C coupling reactions; metal salt-based gold nanocatalysts; theoretical insights into metal nanocatalysts; and nanoparticle mediated clock reaction. This book bridges the gap between nanomaterials synthesis and characterization, and catalysis. As such, this text will be a valuable resource for postgraduate students and researchers in these exciting fields.
Download or read book 1D Oxide Nanostructures Obtained by Sol Gel and Hydrothermal Methods written by Crina Anastasescu and published by Springer. This book was released on 2016-08-30 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents wet chemical sol-gel and hydrothermal methods for 1D oxide nanostructure preparation. These methods represent an attractive route to multifunctional nanomaterials synthesis, as they are versatile, inexpensive and, thus, appropriate for obtaining a wide range of oxide materials with tailored morphology and properties. Three specific oxides (SiO2, TiO2, ZnO) are discussed in detail in order to illustrate the principle of the sol-gel and hydrothermal preparation of 1D oxide nanostructures. Other oxides synthesized via this method are also briefly presented. Throughout the book, the correlation between the tubular structure and the physico-chemical properties of these materials is highlighted. 1D oxide nanostructures exhibit interesting optical and electrical properties, due to their confined morphology. In addition, a well-defined geometry can be associated with chemically active species. For example, the pure SiO2 nanotubes presented a slight photocatalytic activity, while the Pt-doped SiO2 tubular materials act as microreactors in catalytic reactions. In the case of titania and titanate nanotubes, large specific surface area and pore volume, ion-exchange ability, enhanced light absorption, and fast electron-transport capability have attracted significant research interest. The chemical and physical modifications (microwave assisted hydrothermal methods) discussed here improve the formation kinetics of the nanotubes. The ZnO nanorods/tubes were prepared as random particles or as large areas of small, oriented 1D ZnO nanostructures on a variety of substrates. In the latter case a sol-gel layer is deposited on the substrate prior to the hydrothermal preparation. Using appropriate dopants, coatings of ZnO nanorods with controlled electrical behavior can be obtained.
Download or read book Chemistry of Dehydrogenation Reactions and Its Applications written by Syed Shahabuddin and published by CRC Press. This book was released on 2024-02-21 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present book focuses on advancement in the application of heterogeneous catalytic materials for the dehydrogenative synthesis of valuable organic compounds from substrates such as alcohols and simple aliphatic compounds. Several heterogeneous transition metals-based catalytic materials are explored for the synthesis of valuable chemicals for industrial applications. The book provides insight into the application of state-of-the-art technology for energy utilization and clean chemical synthesis. Features: Offers a wide overview of dehydrogenation catalytic chemistry catalyzed by transition metals and their compounds. Helps design novel and more benign and uncomplicated protocols for the synthesis of valuable chemicals from readily available raw materials. Provides deeper insight into the aspect of dehydrogenation reactions for clean chemical synthesis via a cascade process. Summarizes new mechanistic details of dehydrogenation reactions, experimental side development and applications of dehydrogenation techniques. Explores alternative solutions for the assimilation and transportation of clean energy in the form of hydrogen energy utilization. This book is aimed at graduate students and researchers in chemical engineering, chemistry, catalysis, organic synthesis, pharmaceutical chemistry and petrochemistry.
Download or read book Synthesis of Nitrogen doped Carbon Nanotubes written by Kambiz Chizari and published by . This book was released on 2011 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the discovery of carbon nanotubes (CNT) in 1991, a lot of efforts have been done in order to find out their intrinsic properties and their possible applications. One of the most efficient methods used for tuning its physical and chemical properties is doping CNTs by nitrogen or boron. The aim of this work deals with the synthesis of nitrogen-doped carbon nanotubes (N-CNTs) and with the study of the catalytic performance of this material either as catalyst support or as a metal-free catalyst. The influence of the different synthesis parameters on the physical and chemical properties of the N-CNTs was investigated. Afterwards, the N-CNTs were used as catalyst support for the hydrogenation of cinnamaldehyde and its catalytic performance was compared to that obtained on the undoped CNTs. It was shown that N-CNTs synthesized in different conditions lead to different catalytic performances which was mainly linked with the nature of the incorporated nitrogen species. The N-CNTs were also employed as a metal-free catalyst for the selective oxidation of H2S into elemental sulfur and the results are discussed within this thesis. Recently 2D carbon material, namely graphene, has received a great interest due to its special physical properties. The previous investigations on the other graphitic material such as carbon nanotubes facilitate the understanding of the properties and behavior of this material. In this thesis we also worked on the synthesis of the few-layer graphene (FLG), using microwave irradiations. A preliminary study has also done on the nitrogen-doping of this material by microwave treatment on the expanded graphite dispersed in ammonium hydroxide. The FLGs were used as a catalyst support for the hydrogenation of cinnamaldehyde and its catalytic performance is compared to other graphitic materials such as natural graphite, expanded graphite and carbon nanotubes.
Download or read book TiO2 Nanoparticles written by Aiguo Wu and published by John Wiley & Sons. This book was released on 2020-06-02 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unique book that summarizes the properties, toxicology, and biomedical applications of TiO2-based nanoparticles Nanotechnology is becoming increasingly important for products used in our daily lives. Nanometer-sized titanium dioxide (TiO2) are widely used in industry for different purposes, such as painting, sunscreen, printing, cosmetics, biomedicine, and so on. This book summarizes the advances of TiO2 based nanobiotechnology and nanomedicine, covering materials properties, toxicological research, and biomedical application, such as antibacter, biosensing, and cancer theranostics. It uniquely integrates the TiO2 applications from physical properties, toxicology to various biomedical applications, and includes black TiO2 based cancer theranostics. Beginning with a comprehensive introduction to the properties and applications of nanoparticles, TiO2 Nanoparticles: Applications in Nanobiotechnology, Theranostics and Nanomedicine offers chapters on: Toxicity of TiO2 Nanoparticles; Antibacterial Applications of TiO2 Nanoparticles; Surface Enhanced Raman Spectrum of TiO2 Nanoparticle for Biosensing (TiO2 Nanoparticle Served as SERS Sensing Substrate); TiO2 as Inorganic Photosensitizer for Photodynamic Therapy; Cancer Theranostics of Black TiO2 Nanoparticles; and Neurodegenerative Disease Diagnostics and Therapy of TiO2-Based Nanoparticles. This title: -Blends the physical properties, toxicology of TiO2 nanoparticles to the many biomedical applications -Includes black TiO2 based cancer theranostics in its coverage -Appeals to a broad audience of researchers in academia and industry working on nanomaterials-based biosensing, drug delivery, nanomedicine TiO2 Nanoparticles: Applications in Nanobiotechnology, Theranostics and Nanomedicine is an ideal book for medicinal chemists, analytical chemists, biochemists, materials scientists, toxicologists, and those in the pharmaceutical industry.
Download or read book Smart Nanoparticles Technology written by Abbass A. Hashim and published by IntechOpen. This book was released on 2012-04-18 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last few years, Nanoparticles and their applications dramatically diverted science in the direction of brand new philosophy. The properties of many conventional materials changed when formed from nanoparticles. Nanoparticles have a greater surface area per weight than larger particles which causes them to be more reactive and effective than other molecules. In this book, we (InTech publisher, editor and authors) have invested a lot of effort to include 25 most advanced technology chapters. The book is organised into three well-heeled parts. We would like to invite all Nanotechnology scientists to read and share the knowledge and contents of this book.
Download or read book Scientific Bases for the Preparation of Heterogeneous Catalysts written by E. Gaigneaux and published by Elsevier. This book was released on 2010-06-29 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt: These meetings, held every four years, bring together researchers from academia and industry and offer a forum for discussions on the chemistry involved in the preparation of industrial heterogeneous catalysts. Contributions focus on the aspects of catalyst preparation. Reports on physico-chemical characteristics of catalysts and catalytic performances are limited to correlations with the preparation parameters. Contains a collection of the papers presented at the workshop
Download or read book Solar Cells written by Leonid A. Kosyachenko and published by BoD – Books on Demand. This book was released on 2011-11-09 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second book of the four-volume edition of "Solar cells" is devoted to dye-sensitized solar cells (DSSCs), which are considered to be extremely promising because they are made of low-cost materials with simple inexpensive manufacturing procedures and can be engineered into flexible sheets. DSSCs are emerged as a truly new class of energy conversion devices, which are representatives of the third generation solar technology. Mechanism of conversion of solar energy into electricity in these devices is quite peculiar. The achieved energy conversion efficiency in DSSCs is low, however, it has improved quickly in the last years. It is believed that DSSCs are still at the start of their development stage and will take a worthy place in the large-scale production for the future.
Download or read book Supported Catalysts and Their Applications written by David C Sherrington and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need to improve both the efficiency and environmental acceptability of industrial processes is driving the development of heterogeneous catalysts across the chemical industry, including commodity, specialty and fine chemicals and in pharmaceuticals and agrochemicals. Drawing on international research, Supported Catalysts and their Applications discusses aspects of the design, synthesis and application of solid supported reagents and catalysts, including supported reagents for multi-step organic synthesis; selectivity in oxidation catalysis; mesoporous molecular sieve catalysts; and the use of Zeolite Beta in organic reactions. In addition, the two discrete areas of heterogeneous catalysis (inorganic oxide materials and polymer-based catalysts) that were developing in parallel are now shown to be converging, which will be of great benefit to the whole field. Providing a snapshot of the state-of-the-art in this fast-moving field, this book will be welcomed by industrialists and researchers, particularly in the agrochemicals and pharmaceuticals industries.
