Download or read book Applied Electrochemical Methods for Heterogeneous Catalysis written by Anton Tokarev and published by LAP Lambert Academic Publishing. This book was released on 2010-01 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the present work electrochemical methods, namely "cyclic voltammetry" and "in-situ catalyst potential measurements," were applied for ex-situ and in-situ studies of catalysts respectively. Lactose oxidation was used as a model reaction. The combination of these two electrochemical methods gives a possibility for continuous characterization of metal containing heterogeneous catalysts during all steps of their life cycle - from synthesis to complete deactivation. The purpose of the ex-situ approach was to develop a common electrochemical method to characterize all VIII group metal catalysts. General steps, which can be used for every platinum group metal without making any specification or requirements on their nature, were elaborated. Second electrochemical method related to catalyst potential measurements, can provide in-situ information about surface processes in heterogeneous catalytic reactions. Catalyst potential curves can be used to indicate different surface processes. The estimation can be done on the basis on typical patterns. The catalyst potential phenomenon was quantified applying the advanced kinetic expression based on proposed reaction mechanism.
Download or read book Applied Electrochemical Methods for Heterogeneous Catalysis written by Anton Tokarev and published by . This book was released on 2006 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Heterogeneous Catalysts written by Wey Yang Teoh and published by John Wiley & Sons. This book was released on 2021-02-23 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents state-of-the-art knowledge of heterogeneous catalysts including new applications in energy and environmental fields This book focuses on emerging techniques in heterogeneous catalysis, from new methodology for catalysts design and synthesis, surface studies and operando spectroscopies, ab initio techniques, to critical catalytic systems as relevant to energy and the environment. It provides the vision of addressing the foreseeable knowledge gap unfilled by classical knowledge in the field. Heterogeneous Catalysts: Advanced Design, Characterization and Applications begins with an overview on the evolution in catalysts synthesis and introduces readers to facets engineering on catalysts; electrochemical synthesis of nanostructured catalytic thin films; and bandgap engineering of semiconductor photocatalysts. Next, it examines how we are gaining a more precise understanding of catalytic events and materials under working conditions. It covers bridging pressure gap in surface catalytic studies; tomography in catalysts design; and resolving catalyst performance at nanoscale via fluorescence microscopy. Quantum approaches to predicting molecular reactions on catalytic surfaces follows that, along with chapters on Density Functional Theory in heterogeneous catalysis; first principles simulation of electrified interfaces in electrochemistry; and high-throughput computational design of novel catalytic materials. The book also discusses embracing the energy and environmental challenges of the 21st century through heterogeneous catalysis and much more. Presents recent developments in heterogeneous catalysis with emphasis on new fundamentals and emerging techniques Offers a comprehensive look at the important aspects of heterogeneous catalysis Provides an applications-oriented, bottoms-up approach to a high-interest subject that plays a vital role in industry and is widely applied in areas related to energy and environment Heterogeneous Catalysts: Advanced Design, Characterization and Applications is an important book for catalytic chemists, materials scientists, surface chemists, physical chemists, inorganic chemists, chemical engineers, and other professionals working in the chemical industry.
Download or read book Heterogeneous Catalysis at Nanoscale for Energy Applications written by Franklin (Feng) Tao and published by John Wiley & Sons. This book was released on 2015-02-17 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents both the fundamentals concepts and latestachievements of a field that is growing in importance since itrepresents a possible solution for global energy problems. It focuses on an atomic-level understanding ofheterogeneous catalysis involved in important energy conversionprocesses. It presents a concise picture for the entire areaof heterogeneous catalysis with vision at the atomic- and nano-scales, from synthesis, ex-situ and in-situ characterization,catalytic activity and selectivity, to mechanistic understandingbased on experimental exploration and theoretical simulation. The book: Addresses heterogeneous catalysis, one of the crucialtechnologies employed within the chemical and energyindustries Presents the recent advances in the synthesis andcharacterization of nanocatalysts as well as a mechanisticunderstanding of catalysis at atomic level for important processesof energy conversion Provides a foundation for the potential design ofrevolutionarily new technical catalysts and thus the furtherdevelopment of efficient technologies for the global energyeconomy Includes both theoretical studies and experimentalexploration Is useful as both a textbook for graduate and undergraduatestudents and a reference book for scientists and engineers inchemistry, materials science, and chemical engineering
Download or read book Heterogeneous Catalysis written by Moises Romolos Cesario and published by Elsevier. This book was released on 2022-04-27 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterogeneous Catalysis: Materials and Applications focuses on heterogeneous catalysis applied to the elimination of atmospheric pollutants as an alternative solution for producing clean energy and the valorization of chemical products. The book helps users understand the properties of catalytic materials and catalysis phenomena governing electrocatalytic/catalytic reactions, and – more specifically – the study of surface and interface chemistry. By clustering knowledge in these fields, the book makes information available to both the academic and industrial communities. Further, it shows how heterogeneous catalysis applications can be used to solve environmental problems and convert energy through electrocatalytic reactions and chemical valorization. Sections cover nanomaterials for heterogeneous catalysis, heterogeneous catalysis mechanisms, SOX adsorption, greenhouse gases conversion, reforming reactions for hydrogen production, valorization of hydrogen energy, energy conversion and biomass valorization. - Addresses topics of increasing interest to society such as the valorization of biomass, the use of polluting gases to produce value-added products, and the optimization of catalytic materials for water splitting, fuel cells, and other devices - Discusses pollutant adsorption by industrial fume desulphurization processes - Helps improve processes for obtaining chemicals using nonconventional technologies
Download or read book Heterogeneous Catalysts written by Wey Yang Teoh and published by Wiley-VCH. This book was released on 2021-06-08 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents state-of-the-art knowledge of heterogeneous catalysts including new applications in energy and environmental fields This book focuses on emerging techniques in heterogeneous catalysis, from new methodology for catalysts design and synthesis, surface studies and operando spectroscopies, ab initio techniques, to critical catalytic systems as relevant to energy and the environment. It provides the vision of addressing the foreseeable knowledge gap unfilled by classical knowledge in the field. Heterogeneous Catalysts: Advanced Design, Characterization and Applications begins with an overview on the evolution in catalysts synthesis and introduces readers to facets engineering on catalysts; electrochemical synthesis of nanostructured catalytic thin films; and bandgap engineering of semiconductor photocatalysts. Next, it examines how we are gaining a more precise understanding of catalytic events and materials under working conditions. It covers bridging pressure gap in surface catalytic studies; tomography in catalysts design; and resolving catalyst performance at nanoscale via fluorescence microscopy. Quantum approaches to predicting molecular reactions on catalytic surfaces follows that, along with chapters on Density Functional Theory in heterogeneous catalysis; first principles simulation of electrified interfaces in electrochemistry; and high-throughput computational design of novel catalytic materials. The book also discusses embracing the energy and environmental challenges of the 21st century through heterogeneous catalysis and much more. Presents recent developments in heterogeneous catalysis with emphasis on new fundamentals and emerging techniques Offers a comprehensive look at the important aspects of heterogeneous catalysis Provides an applications-oriented, bottoms-up approach to a high-interest subject that plays a vital role in industry and is widely applied in areas related to energy and environment Heterogeneous Catalysts: Advanced Design, Characterization and Applications is an important book for catalytic chemists, materials scientists, surface chemists, physical chemists, inorganic chemists, chemical engineers, and other professionals working in the chemical industry.
Download or read book Chemical Bonding at Surfaces and Interfaces written by Anders Nilsson and published by Elsevier. This book was released on 2011-08-11 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular surface science has made enormous progress in the past 30 years. The development can be characterized by a revolution in fundamental knowledge obtained from simple model systems and by an explosion in the number of experimental techniques. The last 10 years has seen an equally rapid development of quantum mechanical modeling of surface processes using Density Functional Theory (DFT). Chemical Bonding at Surfaces and Interfaces focuses on phenomena and concepts rather than on experimental or theoretical techniques. The aim is to provide the common basis for describing the interaction of atoms and molecules with surfaces and this to be used very broadly in science and technology. The book begins with an overview of structural information on surface adsorbates and discusses the structure of a number of important chemisorption systems. Chapter 2 describes in detail the chemical bond between atoms or molecules and a metal surface in the observed surface structures. A detailed description of experimental information on the dynamics of bond-formation and bond-breaking at surfaces make up Chapter 3. Followed by an in-depth analysis of aspects of heterogeneous catalysis based on the d-band model. In Chapter 5 adsorption and chemistry on the enormously important Si and Ge semiconductor surfaces are covered. In the remaining two Chapters the book moves on from solid-gas interfaces and looks at solid-liquid interface processes. In the final chapter an overview is given of the environmentally important chemical processes occurring on mineral and oxide surfaces in contact with water and electrolytes. - Gives examples of how modern theoretical DFT techniques can be used to design heterogeneous catalysts - This book suits the rapid introduction of methods and concepts from surface science into a broad range of scientific disciplines where the interaction between a solid and the surrounding gas or liquid phase is an essential component - Shows how insight into chemical bonding at surfaces can be applied to a range of scientific problems in heterogeneous catalysis, electrochemistry, environmental science and semiconductor processing - Provides both the fundamental perspective and an overview of chemical bonding in terms of structure, electronic structure and dynamics of bond rearrangements at surfaces
Download or read book Heterogeneous Photocatalysis written by M. Schiavello and published by . This book was released on 1997-10-09 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photocatalysis is a reaction which is accelerated by light while a heterogeneous reaction consists of two phases ( a solid and a liquid for example). Heterogeneous Photocatalysis is a fast developing science which to date has not been fully detailed in a monograph. This title discusses the basic principles of heterogeneous photocatalysis and describes the bulk and surface properties of semiconductors. Applications of various types of photoreactions are described and the problems related to the modeling and design of photoreactors are covered.
Download or read book Carbon Dioxide Electrochemistry written by Marc Robert and published by Royal Society of Chemistry. This book was released on 2020-10-20 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: Homogeneous and Heterogeneous Catalysis
Download or read book Heterogeneous Photocatalysis written by Giuseppe Marcì and published by Elsevier. This book was released on 2019-02-21 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterogeneous Photocatalysis: Relationships with Heterogeneous Catalysis and Perspectives highlights the differences between thermal-catalysis and photo-catalysis and indicates borderlines, in particular, the possible synergism between them. The book outlines the basic aspect of thermal- and photo-catalysis, along with the most important characterization techniques. In addition, it presents case studies of thermal-catalytic and photo-catalytic or thermal-photo-catalytic reactions and includes a comparison between the results obtained using an inorganic solid as thermal catalyst and photocatalyst for the same reaction, and in the same setup. Final sections offer information on the preparation methods of (photo)catalysts, various techniques used for their characterization, engineering and economical aspects. This book will be a valuable reference source for students and researchers involved in heterogeneous photocatalysis and catalysis, chemistry, chemical engineering, materials science, materials engineering, environment engineering, nanotechnology and green chemistry. - Provides selective methods for the preparation of microcrystalline/nanocrystalline solids or films used in catalytic and photocatalytic processes - Describes (photo)reactions that can be carried out catalytically and/or photocatalytically - Outlines the different mechanisms, yields and experimental conditions under which photocatalytic reactions can take place - Describes various (photo)reactors and set ups under which the photacatalytic reactions can be carried out - Provides an economic assessment to understand the feasibility of some photocatalytic reactions
Download or read book Catalysis in Electrochemistry written by Elizabeth Santos and published by John Wiley & Sons. This book was released on 2011-10-18 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysis in Electrochemistry: From Fundamental Aspects to Strategies for Fuel Cell Development is a modern, comprehensive reference work on catalysis in electrochemistry, including principles, methods, strategies, and applications. It points out differences between catalysis at gas/surfaces and electrochemical interfaces, along with the future possibilities and impact of electrochemical science on energy problems. This book contributes both to fundamental science; experience in the design, preparation, and characterization of electrocatalytic materials; and the industrial application of electrocatalytic materials for electrochemical reactions. This is an essential resource for scientists globally in academia, industry, and government institutions.
Download or read book Heterogeneous Catalysis written by Giovanni Palmisano and published by Elsevier. This book was released on 2022-01-08 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: Approx.320 pagesApprox.320 pages
Download or read book Electrochemical Activation of Catalysis written by Costas G. Vayenas and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: I knew nothing of the work of C. G. Vayenas on NEMCA until the early nineties. Then I learned from a paper of his idea (gas interface reactions could be catalyzed electrochemically), which seemed quite marvelous; but I did not understand how it worked. Consequently, I decided to correspond with Professor Vayenas in Patras, Greece, to reach a better understanding of this concept. I think that my early papers (1946, 1947, and 1957), on the relationship between the work function of metal surfaces and electron transfer reactions thereat to particles in solution, held me in good stead to be receptive to what Vayenas told me. As the electrode potential changes, so of course, does the work function at the interface, and gas metal reactions there involve adsorbed particles which have bonding to the surface. Whether electron transfer is complete in such a case, or whether the effect is on the desorption of radicals, the work function determines the strength of their bonding, and if one varies the work function by varying the electrode potential, one can vary the reaction rate at the interface. I got the idea. After that, it has been smooth sailing. Dr. Vayenas wrote a seminal article in Modern Aspects of Electrochemistry, Number 29, and brought the field into the public eye. It has since grown and its usefulness in chemical catalytic reactions has been demonstrated and verified worldwide.
Download or read book Recent Advances in Electrochemical Promotion of Catalysis written by Philippe Vernoux and published by Springer Nature. This book was released on 2022-10-03 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: This contributed volume provides a critical review of research in the field of Electrochemical Promotion of Catalysis (EPOC). It presents recent developments during the past decade that have led to a better understanding of the field and towards applications of the EPOC concept. The chapters focus on the implementation of EPOC for developing sinter-resistant catalysts, catalysts for hydrogen production, ammonia production and carbon dioxide valorization. The book also highlights the developments towards electropromoted dispersed catalysts and for self-sustained electrochemical promotion which are currently expanding. This authoritative analysis of EPOC is useful for various scientific communities working at the interface of heterogeneous catalysis, solid state electrochemistry and materials science. It is of particular interest to groups whose research focuses on developments towards a better and more sustainable future.
Download or read book The Electrochemical Nature of Non faradaic Catalysis at Interfaces written by Thejas S. Wesley and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electric fields are known to play an important role in many catalytic transformations throughout chemistry and biology. In principle, oriented electric fields could also be used to control thermochemical catalysis at solid-liquid interfaces. Yet, the role of electrical polarization in non-faradaic heterogeneous catalysis remains poorly understood, primarily for two reasons. First, it is difficult to monitor electrical polarization at interfaces that are not connected to macroscopic wires. Such "distributed" interfaces, which include solid catalysts (e.g., supported metal nanoparticles) distributed throughout packed-bed or stirred-tank reactors, underpin virtually all of heterogeneous catalysis. Second, mechanistic studies into the role of electric fields in heterogeneous catalysis have been hampered by the lack of a conceptual framework that rigorously captures the impact of electric fields on interfacial reaction kinetics in terms of experimentally measurable quantities. Yet, an experimentally accessible rate theory that rigorously captures electrostatic effects would enable deriving new molecular insight into the nature of interfacial reaction mechanisms from measurements of polarization-dependent reaction rates. Herein, we tackle both challenges in turn. In the first part of this thesis (Chapters 2 and 3), we develop and apply electrochemical methods to study non-faradaic catalysis at distributed (i.e., dispersed in solution), supported catalysts. In Chapter 2, we show how equilibrated spontaneous ion and/or electron transfer reactions from redox active species in solution may be harnessed to electrochemically polarize distributed catalytic interfaces in a predictive and controllable fashion during catalysis. We apply these methods to Pt/C-catalyzed ethylene hydrogenation in aqueous and aprotic organic solutions, and discover that electrochemical polarization plays a key role in governing the rate of this non-polar, non-faradaic reaction across vastly disparate reaction media. In addition, in Chapter 3, we apply infrared and ambient-pressure X-ray photoelectron spectroscopies to demonstrate that spontaneous polarization prevails even for metal nanoparticles supported on a nonconductive oxide host. Although such materials preclude wired connections to control the degree of interfacial polarization, our studies demonstrate that nonconductive catalysts may be electrochemically polarized in a predictable way simply by varying the solution composition (e.g., pH). In the second part of this thesis (Chapters 4 and 5), we investigate the molecular and thermodynamic origins of polarization effects in non-faradaic catalysis. In Chapter 4, we formally synthesize longstanding concepts across physical electrochemistry and chemical kinetics in order to clarify the role of electrostatics in catalysis at interfaces. Specifically, we recapitulate well-established concepts regarding the thermodynamics of adsorption at solid-liquid interfaces, and apply these results within the framework of classical, non-ideal transition state theory to analyze polarization-dependent surface reaction kinetics. This analysis shows how the electric field-dependence of interfacial reaction kinetics arises from partial charge transfer to form surface intermediates and transition states (i.e., the electrosorption valencies). This partial charge transfer endows non-faradaic elementary reactions with electrochemical character, and augments the integer charge equivalents transferred in faradaic elementary reactions. In Chapter 5, we build upon the studies performed in Chapter 2 with experiments investigating the polarization-dependent reaction kinetics of Pt/C-catalyzed ethylene and trans-2-butene hydrogenation. Our observations are all consistent with a model in which polarization of the Pt surface away from the local potential of zero free charge induces polarization-driven adsorption of polar solvent or charged ions near the interface that competes with the olefin for available catalyst sites. In this model, olefin adsorption on the surface displaces polar solvent and charged ions from the interface, which is compensated in an obligatory fashion by spontaneous partial charge transfer from the redox buffer. These results show that even non-faradaic elementary reactions involving negligibly polar species are electrochemical in nature because the surface reaction physically induces motion of polar or charged species near the interface during catalyst turnover. Taken together, the results of this thesis reveal that non-faradaic elementary surface reactions are in fact electrochemical in nature. It is our hope that the approaches and framework advanced here will provide a useful roadmap for further experimental investigations into the electrochemical nature of reactions at interfaces.
Download or read book Computational Catalysis written by Aravind Asthagiri and published by Royal Society of Chemistry. This book was released on 2014 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive review of the methods and approaches being adopted to push forward the boundaries of computational catalysis.
