Download or read book Mesoporous Manganese Oxide Materials for Aerobic Oxidation Reactions written by Sourav Biswas and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis presented here is focused on fabricating thermally stable and tunable mesoporous manganese oxide materials for catalytic aerobic oxidation reactions. From the viewpoint of green chemistry, the design of novel methodologies for oxidation, preferably under aerobic atmospheric condition, without any additives is highly desirable. Being motivated by advances in catalytic materials as fundamental pillars of â€green chemistry’, my research is devoted to designing of useful materials in oxidative catalysis that may serve the purpose of sustainable energy sources in harmony with the environment and nature. The five chapters provided here will discuss the importance of catalytic oxidation reactions, synthesis, and characterization of the mesoporous manganese oxide materials and their applications in a series of simple to complex oxidation reactions. We demonstrate the activity enhancement of mesoporous manganese oxide materials by introducing alkali metal ions in a simple alcohol oxidation reaction. The major achievement of this work is inventing a cesium ion promoted mesoporous manganese oxide, which was found to be active in a multitude of aerobic oxidation reactions. In terms of catalytic oxidation reactions, oxidation of alcohol to aldehydes, amines to imines, a versatile one –pot tandem oxidation processes and oxidative coupling of alkynes have been discussed. Moreover, mechanistic aspects of catalytic oxidation are studied in details, especially the role of the surface oxygen species, oxygen vacancies and related oxygen transportation of the metal oxides. The catalytic oxidation protocols discussed here have several advantages over the existing systems in addressing the goals of green chemistry. First, the heterogeneous nature of the catalyst provides ease of separation of product. Next, excellent reusability of the catalyst (as high as 8 cycles) and formation of water as the only by-product (in most of the cases) reduces toxic waste production. Finally, absence of additives and use of air as the terminal oxidant exemplify the greener, more efficient and less expensive nature of these processes.
Download or read book Understanding Homogeneous and Heterogeneous Transition Metal Oxide Catalytic Systems for Partial Oxidation Reactions written by Ehsan Moharreri and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Transition metal oxide-based systems as catalysts for oxidative reactions are studied. Utilizing aerobic oxygen as a cost-efficient and benign oxidant is explored for alcohol oxidation reactions. A detailed magnetic study is performed to understand the active phases of manganese oxide catalysts. The role of a well-known homogeneous copper oxide catalyst in an oxidation reaction is explored for making alcohols from aliphatic hydrocarbons. Finally, virtual screening techniques are explored in a preliminary study for materials discovery. In chapter I, aerobic transformation of alcohols is studied by mesoporous manganese oxide and cobalt oxide species. Catalyst optimization, characterization and substrate scope experimentation is performed for self-esterification of alcohols and aldehydes. In chapter II, a comprehensive magnetic characterization of mesoporous manganese oxide species is provided. While conventional methods do not lead to definitive phase determination, magnetic transitions and spin eco NMR techniques prove the mixed phase of meso MnOx materials. In chapter III, a synthetic copper complex is studied. The complex was modeled after the active site of particulate methane monooxygenase (pMMO). A detailed study of the complex structure, reaction medium and by- products showed that an important side reaction interfered with hydrocarbon oxidation. The nitrile solvent decomposes to amide by nucleophilic interactions from hydrogen peroxide. In the final chapter, preliminary computational screening tools are introduced. Extraction of geometrical features of molecular structures and evaluation of total energy with machine learning algorithms are performed and the ground work for application of such work to crystalline materials is proposed.
Download or read book The Development and Mechanistic Investigations of Various Catalytic Processes by Mesoporous Metal Oxides and Sulfides written by Biswanath Dutta and published by . This book was released on 2018 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis includes five chapters. The 1st Chapter provides a brief introduction of mesoporous materials and heterogeneous catalysis. Chapter 2 describes the coupling of anilines to azo dyes in the presence of mesoporous manganese oxide materials. In Chapter 3 an extension of the applicability of mesoporous manganese oxide catalysts to cross dehydrogenative coupling of N-Aryltetrahydroisoquinolines (sp3 C-H) with indoles (sp2 C-H) is discussed. Moreover, in Chapter 4 the applicability of mesoporous cobalt sulfoselenide system was studied for producing hydrogen from water under electro-catalytic conditions. Finally, in Chapter 5, the future perspectives of the development of mesoporous materials has been discussed to extend their applicability to performing complicated chemical reactions. Since the past few decades, intense research is ongoing for development of alternatives to fossil fuels and petroleum products. To curb the menace of global warming, the development of green chemical pathways is also a recent focus. These green chemical methodologies are intended to repel traditional pathways that often involve the use or production of toxic elements, environmentally unfriendly protocols, and non-reusable techniques. Therefore, to develop green chemical pathways for reactions, systems are designed using earth-abundant but non-toxic elements. Moreover, these reusable protocols are preferred to be operable under atmospheric conditions, and without any additives. These fundamentals of 'green chemistry', interested me in understanding the surface chemistry and further the applications of mesoporous metal oxides and sulfides such as manganese oxides and cobalt sulfides. In this thesis, the importance of different catalytic processes, their operational procedures, and fundamental details have been depicted. We have identified the active sites responsible for the excellent activity of reported transformations. Detailed investigation of the surface chemistry of these heterogeneous catalytic processes is expected to facilitate the understanding and further the advancement of rather complicated procedures. Computational calculations were performed in all cases to support our experimental findings. These non-toxic, additive free catalytic protocols discussed here showed excellent reusability and environmentally benign waste (water) generation, which abides by the rules of Green Chemistry.
Download or read book Biomass Biofuels Biochemicals written by S. Saravanamurugan and published by Elsevier. This book was released on 2019-10-23 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biomass, Biofuels, Biochemicals: Recent Advances in Development of Platform Chemicals provides a detailed overview on the experimentally developed methods that facilitate platform chemicals derivation from biomass-based substrates with robust catalyst systems. In addition, the book highlights the green chemistry approach towards platform chemical production. Chapters discuss platform chemicals and global market volumes, the optimization of process schemes and reaction parameters with respect to achieving a high yield of targeted platform chemicals, such as sugars and furonic compounds by modifying the respective catalytic system, the influence of solvents on reaction selectivity and product distribution, and the long-term stability of employed catalysts. Overall, the objectives of the book are to provide the reader with an understanding of the societal importance of platform chemicals, an assessment of the techno-economic viability of biomass valorization processes, catalyst design for a specific reaction, and the design of a catalytic system. Covers recent developments on platform chemicals Provides comprehensive technological developments on specific platform chemicals Covers organic transformations, catalytic synthesis, thermal stability, reaction parameters and solvent effect Includes case studies on the production of a number of chemicals, such as Levulinic acid, glycerol, phenol derivatives, and more
Download or read book Advanced catalytic materials and technologies in biomass conversion written by Xianxiang Liu and published by Frontiers Media SA. This book was released on 2023-04-06 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Noble Metal Metal Oxide Hybrid Nanoparticles written by Satyabrata Mohapatra and published by Elsevier. This book was released on 2018-10-11 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noble Metal-Metal Oxide Hybrid Nanoparticles: Fundamentals and Applications sets out concepts and emerging applications of hybrid nanoparticles in biomedicine, antibacterial, energy storage and electronics. The hybridization of noble metals (Gold, Silver, Palladium and Platinum) with metal-oxide nanoparticles exhibits superior features when compared to individual nanoparticles. In some cases, metal oxides act as semiconductors, such as nano zinc oxide or titanium oxide nanoparticles, where their hybridization with silver nanoparticles, enhanced significantly their photocatalytic efficiency. The book highlights how such nanomaterials are used for practical applications. Examines the properties of metal-metal oxide hybrid nanoparticles that make them so adaptable Explores the mechanisms by which nanoparticles interact with each other, showing how these can be exploited for practical applications Shows how metal oxide hybrid nanomaterials are used in a range of industry sectors, including energy, the environment and healthcare
Download or read book From Microporous to Mesoporous Manganese Oxide Crystalline Phases written by Zheng-Rong Tian and published by . This book was released on 1998 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Crystalline Metal Oxide Catalysts written by Wataru Ueda and published by Springer Nature. This book was released on 2022-10-26 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the innovatively advanced crystalline metal oxide catalysts that have multi-catalytic functions on the basis of spatially placed elements in crystal structure. With authors who are experts in their fields, the chapters of the book are organized according to catalytic function, on the basis of crystal structure. The book also covers the structure determination of micro–nano-sized metal oxide crystals that are now standard in most catalytic materials and new trends in catalyst development using materials informatics and catalytic informatics. The information contained here will guide researchers who are eager to carry out sustainable catalytic processes and ultimately to achieve a sustainable society in their quest for catalyst development.
Download or read book Nanocasting written by An-Hui Lu and published by Royal Society of Chemistry. This book was released on 2010 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured materials with tailored properties are regarded as a fundamental element in the development of future science and technology. Research is still ongoing into the nanosized construction elements required to create functional solids. The recently developed technique, nanocasting, has great advantage over others in terms of the synthesis of special nanostructured materials by the careful choice of suitable elements and nanoengineering steps. This new book summarizes the recent developments in nanocasting, including the principles of nanocasting, syntheses of novel nanostructured materials, characterization methods, detailed synthetic recipes and further possible development in this area. The book focuses on the synthesis of porous solids from the viewpoint of methodology and introduces the science of nanocasting from fundamental principles to their use in synthesis of various materials. It starts by outlining the principles of nanocasting, requirements to the templates and precursors and the tools needed to probe matter at the nanoscale level. It describes how to synthesize nano structured porous solids with defined characteristics and finally discusses the functionalization and application of porous solids. Special attention is given to new developments in this field and future perspectives. A useful appendix covering the detailed synthetic recipes of various templates including porous silica, porous carbon and colloidal spheres is included which will be invaluable to researchers wanting to follow and reproduce nanocast materials. Topics covered in the book include: * inorganic chemistry * organic chemistry * solution chemistry * sol-gel and interface science * acid-base equilibria * electrochemistry * biochemistry * confined synthesis The book gives readers not only an overview of nanocasting technology, but also sufficient information and knowledge for those wanting to prepare various nanostructured materials without needing to search the available literature.
Download or read book Preparative Parameters Mechanisms and Kinetics in the Syntheses of Layered and Tunnel Manganese Oxides written by Jian Luo and published by . This book was released on 1999 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies of Layered and Pillared Manganese Oxide Materials written by Ying Ma and published by . This book was released on 1999 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanostructured Catalysts written by Christian Hess and published by Royal Society of Chemistry. This book was released on 2011-07-22 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book gives a comprehensive up-to-date summary of the existing information on the structural/electronic properties, chemistry and catalytic properties of vanadium and molybdenum containing catalysts. It discusses the importance of nanoscience for the controlled synthesis of catalysts with functional properties and introduces the necessary background regarding surface properties and preparation techniques, leading from a textbook level to the current state of knowledge. Then follows an extensive survey and analysis of the existing open and patent literature - an essential knowledge source for the development of the new generation of partial oxidation catalysts. Important examples from current research on partial oxidation reactions are reviewed from experts in the field. The next chapter discusses the importance of 2- and 3-dimensional model systems for a fundamental understanding of the structure of transition metal oxide catalysts and its correlation to reactivity. Finally, an outlook on research opportunities within the area of partial oxidation reactions is presented.
Download or read book Metal Oxides in Heterogeneous Catalysis written by Jacques C. Vedrine and published by Elsevier. This book was released on 2018-01-11 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal Oxides in Heterogeneous Catalysis is an overview of the past, present and future of heterogeneous catalysis using metal oxides catalysts. The book presents the historical, theoretical, and practical aspects of metal oxide-based heterogeneous catalysis. Metal Oxides in Heterogeneous Catalysis deals with fundamental information on heterogeneous catalysis, including reaction mechanisms and kinetics approaches.There is also a focus on the classification of metal oxides used as catalysts, preparation methods and touches on zeolites, mesoporous materials and Metal-organic frameworks (MOFs) in catalysis. It will touch on acid or base-type reactions, selective (partial) and total oxidation reactions, and enzymatic type reactions The book also touches heavily on the biomass applications of metal oxide catalysts and environmentally related/depollution reactions such as COVs elimination, DeNOx, and DeSOx. Finally, the book also deals with future trends and prospects in metal oxide-based heterogeneous catalysis. Presents case studies in each chapter that provide a focus on the industrial applications Includes fundamentals, key theories and practical applications of metal oxide-based heterogeneous catalysis in one comprehensive resource Edited, and contributed, by leading experts who provide perspectives on synthesis, characterization and applications
Download or read book Fundamental Studies on the Catalytic Properties of Manganese Oxides in Oxidation Reactions written by Niklas Cibura and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Manganese Oxide Based Catalysts for the Oxygen Reduction and Oxygen Evolution Reactions written by Yelena Gorlin and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of active catalytic materials for the oxygen reduction reaction (ORR, O2 + 4H+ + 4e- 2!2H2O) and the oxygen evolution reaction (OER, 2H2O 2!O2 + 4H+ + 4e- ) is one of the major challenges in energy conversion and storage technologies such as fuel cells, metal-air batteries, electrolysis cells, and solar fuel synthesis. The majority of industrially relevant active materials are precious metals and metal oxides, whose high cost and scarcity limits the widespread adoption of these important technologies. Manganese oxides (MnOx) catalysts are an interesting alternative to the precious metal based electrodes under alkaline conditions due to their abundance, low cost, and a demonstrated ability to catalyze both the ORR and the OER at high pH values. To accelerate the development of MnOx catalysts with improved activities for the ORR and the OER, it is important to increase understanding of the surface properties at the ORR and the OER relevant potentials. Spectroscopy techniques, including x-ray photoelectron spectroscopy (XPS) and x-ray absorption spectroscopy (XAS), are among the possible methods to monitor surface chemistry of catalytic materials. Both XPS and XAS can offer information on the electronic structure of the surface, while XAS can also probe the short-range order of the catalysts. This dissertation focuses on development of MnOx catalysts for the ORR and the OER and uses ex-situ XPS, ex-situ Mn L-edge XAS, and in-situ Mn K-edge XAS to correlate measured catalytic activity to the surface oxidation state of Mn.
Download or read book Supported Metals in Catalysis written by James Arthur Anderson and published by World Scientific. This book was released on 2012 with total page 581 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contributions from experts in supported metal catalysis, from both the industry and academia, this book presents the latest developments in characterization and application of supported metals in heterogeneous catalysis. In addition to a thorough and updated coverage of the traditional aspects of heterogeneous catalysis such as preparation, characterization and use in well-established technologies such as Naphtha reforming, the book also includes emerging areas where supported metal catalysis will make significant contributions in future developments, such as fuel cells and fine chemicals synthesis. The second edition of Supported Metals in Catalysis comes complete with new and updated chapters containing important summaries of research in a rapidly evolving field. Very few other books deal with this highly pertinent subject matter, and as such, it is a must-have for anyone working in the field of heterogeneous catalysis.
Download or read book Creative Complex Systems written by Kazuo Nishimura and published by Springer Nature. This book was released on 2021-10-26 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, problems such as environmental and economic crises and pandemics caused by new viruses have been occurring on a global scale. Globalization brings about benefits, but it can increase the potential risks of “systemic problems”, leading to system-wide disruptions. The coronavirus pandemic, declared on March 11, 2020, by the World Health Organization, has revealed social disparities in the form of a higher risk of death for people of low-socioeconomic status and has caused massive destruction of the economy and of globalization itself. Extensive efforts to cope with these challenges have often led to the emergence of additional problems due to the chain of hidden causation. What can be done to protect against such emerging challenges? Despite the resulting complexity, once these individual problems are considered as different aspects of a single whole, seemingly contradictory issues can become totally understandable, as they can be integrated into a single coherent framework. This is the integrationist approach in contrast to the reductionist approach. Situations of this kind are truly relevant to understanding the question, “What are creative complex systems?” This book features contributions by members and colleagues of the Kyoto University International Research Unit of Integrated Complex System Science. It broadens our outlook from the traditional view of stability, in which global situations are eventually stabilized after the impact of destruction, to “creative” complex systems.
