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Novel Catalytic Materials For Methane Activation And Selective Oxidation Of Hydrocarbons
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Book Synopsis Novel Catalytic Materials for Methane Activation and Selective Oxidation of Hydrocarbons by : George Nicolas Kastanas
Download or read book Novel Catalytic Materials for Methane Activation and Selective Oxidation of Hydrocarbons written by George Nicolas Kastanas and published by . This book was released on 1990 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: design strategies that would improve the yields of the useful intermediate products.
Book Synopsis New Frontiers in Catalysis, Parts A-C by : L. Guczi
Download or read book New Frontiers in Catalysis, Parts A-C written by L. Guczi and published by Elsevier. This book was released on 1993-04-20 with total page 2955 pages. Available in PDF, EPUB and Kindle. Book excerpt: These volumes comprise the proceedings of the major international meeting on catalysis which is held at 4 year intervals. The programme focussed on New Frontiers in Catalysis including nontraditional catalytic materials and environmental catalysis. The contributions cover a wide range of fundamental, applied, industrial and engineering aspects of catalysis. The extensive range of highly efficient industrial techniques for observing and characterizing catalytically important surfaces is evident. The programme covered the following sessions: Mechanism, theory, in situ methods; Catalytic reaction on atomically clean surfaces; Catalytic reaction on zeolites and related substances; New methods and principles for catalyst preparation; Hydrotreatment reactions (HDS, HDN); Characterization of catalysts, application of novel techniques; Selective oxidation; New catalytic aspects of heteropoly acids and related compounds; Reaction of hydrocarbons; Nontraditional catalytic materials; Fuel upgrading; Alkane activation; Acid-base catalysis; New selective catalytic reactons, fine chemicals; Environmental catalysis; Industrial catalysis, deactivation, reactivation; Synthesis from syngas; Electrocatalysis; Photocatalysis. The invited lectures and 433 papers included in these volumes present an update on all areas of catalysis and applications.
Book Synopsis Novel Catalytic Materials for Selective Oxidation of Carbon Monoxide for Use in Fuel Cells by : Shailesh Kumar Jain
Download or read book Novel Catalytic Materials for Selective Oxidation of Carbon Monoxide for Use in Fuel Cells written by Shailesh Kumar Jain and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalytic Activation and Functionalisation of Light Alkanes by : E.G. Derouane
Download or read book Catalytic Activation and Functionalisation of Light Alkanes written by E.G. Derouane and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Light alkanes tend to be resistant to many forms of activation. The horizontal approach of the present book covers homogeneous, heterogeneous and biological catalysis, thus allowing readers to gain an awareness of progress and ideas in research areas different from their own. The book contains both general chapters, giving an overview of the subject, and specialised contributions that deal with the details and state of the art. A specialist report is also included which gives a critical insight into current progress and discusses future prospects and major challenges. Audience: Newcomers and senior researchers in the field of alkane activation. The mixed theoretical and practical approach will be of interest to researchers and industrialists alike.
Book Synopsis Frontiers of Green Catalytic Selective Oxidations by : Konstantin P. Bryliakov
Download or read book Frontiers of Green Catalytic Selective Oxidations written by Konstantin P. Bryliakov and published by Springer Nature. This book was released on 2019-10-02 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: The demand for novel efficient and environmentally sustainable chemo, regio- and stereoselective catalyst systems for the oxidation of organic substrates is continuously growing in line with toughening economic and environmental constraints. This book addresses these issues; it consists of eleven chapters written by world-recognized experts in green and sustainable oxidation catalysis. The most urgent and challenging topics, in the judgment of the editor, such as green asymmetric epoxidations, sulfoxidatiuons, C–H oxidations; oxidation catalysis by polyoxometalates and oxidations in non-conventional solvents, etc. have been critically reviewed in this book. Both fundamental aspects, such as catalysts design, catalytic properties, nature of catalytically active sites and reaction mechanisms, and practical outlook of the oxidations have been addressed by the authors. The book appeals to a broad readership, particularly graduate students, employees of universities and research organizations, and industrial researchers, particularly those working in the areas of homogeneous oxidation catalysis, asymmetric synthesis, organocatalysis, sustainable catalytic processes and green chemistry, mechanisms of catalytic reactions, synthesis of bioactive compounds, biomimetic chemistry, etc. Konstantin Bryliakov is Leading Researcher at the Boreskov Institute of Catalysis. In 2016, he was elected Honorary Professor of the Russian Academy of Sciences.
Book Synopsis Exploring Novel Catalysts for Selective Oxidation of Methane Into Value Added Chemicals by : Gourishankar Karoshi
Download or read book Exploring Novel Catalysts for Selective Oxidation of Methane Into Value Added Chemicals written by Gourishankar Karoshi and published by . This book was released on 2013 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct Natural Gas Conversion to Value-Added Chemicals by : Jianli Hu
Download or read book Direct Natural Gas Conversion to Value-Added Chemicals written by Jianli Hu and published by CRC Press. This book was released on 2020-09-25 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct Natural Gas Conversion to Value-Added Chemicals comprehensively discusses all major aspects of natural gas conversion and introduces a broad spectrum of recent technological developments. Specifically, the book describes heterogeneous and homogeneous catalysis, microwave-assisted conversion, non-thermal plasma conversion, electrochemical conversion, and novel chemical looping conversion approaches. Provides an excellent benchmark resource for the industry and academics Appeals to experienced researchers as well as newcomers to the field, despite the variety of contributing authors and the complexity of the material covered Includes all aspects of direct natural gas conversion: fundamental chemistry, different routes of conversion, catalysts, catalyst deactivation, reaction engineering, novel conversion concepts, thermodynamics, heat and mass transfer issues, system design, and recent research and development Discusses new developments in natural gas conversion and future challenges and opportunities This book is as an excellent resource for advanced students, technology developers, and researchers in chemical engineering, industrial chemistry, and others interested in the conversion of natural gas.
Book Synopsis Natural Gas Conversion V by : A. Parmaliana
Download or read book Natural Gas Conversion V written by A. Parmaliana and published by Elsevier. This book was released on 1998-09-17 with total page 1005 pages. Available in PDF, EPUB and Kindle. Book excerpt: On January 1988, the ascertained and economically accessible reserves of Natural Gas (NG) amounted to over 144,000 billion cubic meters worldwide, corresponding to 124 billion tons of oil equivalents (comparable with the liquid oil reserves, which are estimated to be 138 billion TOE). It is hypothesized that the volume of NG reserve will continue to grow at the same rate of the last decade. Forecasts on production indicate a potential increase from about 2,000 billion cubic meters in 1990 to not more than 3,300 billion cubic meters in 2010, even in a high economic development scenario. NG consumption represents only one half of oil: 1.9 billion TOE/y as compared to 3.5 of oil. Consequently, in the future gas will exceed oil as a carbon atom source. In the future the potential for getting energetic vectors or petrochemicals from NG will continue to grow. The topics covered in Natural Gas Conversion V reflect the large global R&D effort to look for new and economic ways of NG exploitation. These range from the direct conversion of methane and light paraffins to the indirect conversion through synthesis gas to fuels and chemicals. Particularly underlined and visible are the technologies already commercially viable. These proceedings prove that mature and technologically feasible processes for natural gas conversion are already available and that new and improved catalytic approaches are currently developing, the validity and feasibility of which will soon be documented. This is an exciting area of modern catalysis, which will certainly open novel and rewarding perspectives for the chemical, energy and petrochemical industries.
Book Synopsis Natural Gas Conversion by : A. Holmen
Download or read book Natural Gas Conversion written by A. Holmen and published by Elsevier. This book was released on 1991-05-27 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings reflect the extensive fundamental and applied research efforts that are currently being made on the conversion of gas, in particular on the direct conversion of methane. The Symposium in Oslo focused on the following topics: Direct conversion of methane, Fischer-Tropsch chemistry, methanol conversion and natural gas conversion processes. The main aim was to present the state-of-the-art and progress currently being made within each of these areas. The book contains the papers presented and includes plenary lectures, short communications and posters. The papers will be of interest to scientists and engineers working in the field of gas conversion, transportation fuels, primary petrochemicals and catalysis.
Book Synopsis Contemporary Catalysis by : Julian R.H. Ross
Download or read book Contemporary Catalysis written by Julian R.H. Ross and published by Elsevier. This book was released on 2018-11-16 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contemporary Catalysis: Fundamentals and Current Applications deals with the fundamentals and modern practical applications of catalysis. Topics addressed include historical development and the importance of heterogeneous catalysis in the modern world, surfaces and adsorption, the catalyst (preparation and characterization), the reactor (integral and differential reactors, etc.), and an introduction to spectroscopic and thermal characterization techniques. Building on this foundation, the book continues with chapters on important industrial processes, potential processes and separate chapters on syngas production, Fischer Tropsch synthesis, petroleum refining, environmental protection, and biomass conversion. Contemporary Catalysis is an essential resource for chemists, physical chemists, and chemical engineers, as well as graduate and post graduate students in catalysis and reaction engineering. Covers all aspects of catalysis in a carefully organized text Includes material on historical development Provides a wide range of student tasks, case studies, and supplementary, web-based materials that are regularly updated
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-11 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical Insights Into the Selective Oxidation of Methane to Methanol by : Allegra Latimer
Download or read book Theoretical Insights Into the Selective Oxidation of Methane to Methanol written by Allegra Latimer and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: While the search for catalysts capable of directly converting methane to higher value commodity chemicals and liquid fuels has been active for over a century, a viable industrial process for selective methane activation has yet to be developed. Generally, this failure has been attributed to two primary difficulties: (1) the high barriers required to activate methane (activity), and (2) the higher activity of the C-H bonds in methanol compared to methane (selectivity). In this thesis, we delve into both of these problems and identify general frameworks and strategies that can be used in future research to identify promising catalyst materials. First, we show that, for the wide range of catalysts that proceed via a radical intermediate, a unifying framework for predicting C-H activation barriers using a single universal descriptor can be established. We combine this scaling approach with a thermodynamic analysis of active site formation to provide a map of methane activation rates, and successfully rationalize the available empirical data across catalyst classes. We then extend this analysis to catalysts that proceeed via a surface-stabilized transition state for methane activation. We present a framework for predicting the transition state's geometry (radical or surface-stabilized) and its approximate energy on a given active site. We then shift our attention to understanding and optimizing selectivity. First, we determine the principles guiding the selectivity of a related reaction, direct methanol to formaldehyde on ruthenium oxide catalysts, and find that limiting electrophilic surface oxygen coverage for this reaction is key to obtaining high selectivity. Next, recognizing that a precise and general quantification of the limitations of catalytic direct methane to methanol has not yet been established, we present a simple kinetic model to explain the selectivity-conversion tradeoff that hampers continuous partial oxidation of methane to methanol. Stemming from this analysis, we suggest several design strategies for increasing methanol yields under the constraint of the selectivity-conversion tradeoff. These strategies include (1) "collectors, " materials with strong methanol adsorption potential that can help to lower the partial pressure of methanol in the gas phase, (2) aqueous reaction conditions, and/or (3) diffusion-limited systems. Having identified these strategies, we work towards realizing a system capitalizing on (2), aqueous reaction conditions, by collaborating with experimental colleagues to develop a low-temperature electrochemical approach for methane oxidation. It is the general aim of this thesis to develop straightforward, accessible models with the help of Density Functional Theory that yield generalizable insights. We are hopeful that the models presented herein may provide a reliable framework for future researchers working to understand and evaluate new catalysts and processes for the direct oxidation of methane to methanol.
Download or read book 室町ごころ written by and published by . This book was released on 1978 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Methane Conversion by Oxidative Processes by : Eduardo E. Wolf
Download or read book Methane Conversion by Oxidative Processes written by Eduardo E. Wolf and published by Springer. This book was released on 1992 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: A reasonable case could be made that the scientific interest in catalytic oxidation was the basis for the recognition of the phenomenon of catalysis. Davy, in his attempt in 1817 to understand the science associated with the safety lamp he had invented a few years earlier, undertook a series of studies that led him to make the observation that a jet of gas, primarily methane, would cause a platinum wire to continue to glow even though the flame was extinguished and there was no visible flame. Dobereiner reported in 1823 the results of a similar investigation and observed that spongy platina would cause the ignition of a stream of hydrogen in air. Based on this observation Dobereiner invented the first lighter. His lighter employed hydrogen (generated from zinc and sulfuric acid) which passed over finely divided platinum and which ignited the gas. Thousands of these lighters were used over a number of years. Dobereiner refused to file a patent for his lighter, commenting that "I love science more than money." Davy thought the action of platinum was the result of heat while Dobereiner believed the ~ffect ~as a manifestation of electricity. Faraday became interested in the subject and published a paper on it in 1834; he concluded that the cause for this reaction was similar to other reactions.
Book Synopsis Colloidal Design of Active, Selective, and Stable Catalysts for Methane Utilization by : Emmett Daniel Goodman
Download or read book Colloidal Design of Active, Selective, and Stable Catalysts for Methane Utilization written by Emmett Daniel Goodman and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to recent advances in locating and extracting natural gas resources, scientists in academia and industry are looking for new processes to take advantage of methane as a chemical precursor and fuel. However, there remain significant challenges in methane utilization; these are related to the strength of methane's carbon-hydrogen bonds, which makes this molecule difficult to activate and utilize. Without a catalyst, methane activation necessitates very high temperatures (~1000 oC), which lead to high energy costs, advanced infrastructure, toxic by-products, and poor product selectivity. Our work focuses on developing catalysts with well-defined structural properties to understand what makes materials active, selective, and stable for methane transformations. To understand which specific nanostructures are best for methane activation, size- and composition- controlled Pt/Pd nanocrystals were designed and studied to reveal the effect of catalyst structure on methane activation. Here, we discuss the effect of these unexplored parameters on methane activation rates, resistance to common catalytic poisons, and changes in oxidation state -- each of which has an important role in contributing to low-temperature activity. Perhaps the greatest challenge in methane activation is selective product formation. In this area, we studied how tuning catalyst support can help selectively produce valuable products (synthesis gas) rather than typical combustion products (carbon dioxide and water). Additionally, we started looking at even more unique nanostructures, involving both organic and inorganic components, for selective methane transformations. The high temperatures needed to activate methane require stable catalysts. By taking advantage of modular colloidal catalyst assembly, we demonstrated synthetic approaches to tune, and measure, the spatial properties of nanocrystal active sites. We found that in many conditions, the spatial properties of active sites determined catalyst stability. In Pd/Al2O3 materials we observed that closer nanocrystals are more stable, in a distant-dependent degradation process. However, in Pd/SiO2 materials we found the opposite - that stability properties are largely distant-independent. Overall, by developing colloidal approaches to catalyst synthesis, we created well-defined catalysts with precisely-controlled sizes, compositions, and spatial properties, which have helped us uncover important design rules for active, selective, and stable methane transformations.
Book Synopsis Developing Methods to Inform Catalyst Design for the Electrochemical Oxidation of Methane and Alcohols by : Michael James Boyd
Download or read book Developing Methods to Inform Catalyst Design for the Electrochemical Oxidation of Methane and Alcohols written by Michael James Boyd and published by . This book was released on 2021 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the production of natural gas and agricultural biomass/energy crops increases, new efficient and sustainable technologies will be required to convert these feedstock molecules into the same fuels and chemical we get from conventional petroleum today. Electrochemistry is a possible tool for the conversion of these species that can be coupled to renewable electricity. The discovery and development of selective and active electrocatalysts is one of the primary challenges in utilizing natural gas and biomass resources. But first there is a lack of fundamental understanding in (1) the reaction mechanism and (2) how operating conditions such as potential, electrolyte pH, mass transport, and time affect the the activity and selectivity of catalysts. To this end platinum was used as a model system to study electrochemical methane oxidation at room temperature and pressure. The experimental results on platinum combined with density functional theory calculations show that methane is first thermally activated at Pt (211) like step sites, then the resulting methyl intermediate is electrochemically oxidized to CO* which is in equilibrium with the final product CO2. The equilibrium can be shifted to favor complete oxidation by adjusting the applied electrochemical potential, specifically at potentials below 0.5 V vs. RHE CO* is the most thermodynamically stable species along the reaction pathway whereas above 0.5 V vs. RHE CO2 is now the most stable species. Important to note however is that since the kinetics for methane activation are very slow (barrier of ~0.95 eV) the platinum surface must be free of other adsorbed species, namely protons or hydroxides. Based on reaction mechanism for electrochemical methane oxidation on platinum it is unlikely that partial oxidation of methane on metallic electrodes well occur. For this reason we probed the activity of several transition metal oxide materials with the hope that they may be active for methane oxidation. Unfortunately our initial results suggest no significant methane oxidation occurs on these materials. In the case of biomass oxidation 1st row transition metal oxides have recently been shown to be quite selective in the conversion of alcohols to their corresponding carboxylic acids. Benzyl alcohol was used as a model molecule to study the reaction mechanism for alcohol oxidation on Ni(OH)2 electrodes as a function of potential and electrolyte pH. It was found that the active phase for alcohol oxidation is the metal oxy-hydroxide. The activity and selectivity were found to be heavily dependent on the electrolyte pH. Under strong alkaline conditions (> pH 13) high current densities and complete oxidation of benzyl alcohol to benzoate was favored whereas at more moderately alkaline conditions low current densities and partial oxidation to benzaldehyde was favored. Based on these results we hypothesize that a significant concentration of OH- in solution is required to activated the intermediate product benzaldehyde. The activity of several novel Ni materials was also probed for benzyl alcohol oxidation. Ni-doped nitrided carbons which have single atom nickel active sites were found to be selective for partial oxidation, however further optimization of the catalyst synthesis is required to increase the activity to compete with the bulk Ni(OH)2 electrodes. In conclusion, this dissertation presents a variety of experimental work focused on identifying the reaction mechanism for several oxidation reactions and provides key understanding that can be used towards the development of new electrocatalysts for the oxidation of hydrocarbons and alcohols.
Book Synopsis Solar-Energy-Mediated Methane Conversion Over Nanometal and Semiconductor Catalysts by : Hui Song
Download or read book Solar-Energy-Mediated Methane Conversion Over Nanometal and Semiconductor Catalysts written by Hui Song and published by Springer Nature. This book was released on 2020-11-30 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book demonstrates that solar energy, the most abundant and clean renewable energy, can be utilized to drive methane activation and conversion under mild conditions. The book reports that coupling solar energy and thermal energy can significantly enhance methane conversion at mild temperatures using plasmonic nanometal-based catalysts, with a substantial decrease in apparent activation energy of methane conversion. Furthermore, this book, for the first time, reports the direct photocatalytic methane oxidation into liquid oxygenates (methanol and formaldehyde) with only molecular oxygen in pure water at room temperature with high yield and selectivity over nanometals and semiconductors (zinc oxide and titanium dioxide). These findings are a big stride toward methane conversion and inspire researchers to develop strategies for efficient and selective conversion of methane to high-value-added chemicals under mild conditions.
