Synthesis and Activation of a Thermally Stable Ceria-Supported Platinum Single-Atom Catalyst for Low-Temperature CO Oxidation PDF Download
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Author: Xavier Isidro Pereira Hernandez
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 268
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Book Description
Ceria-supported Pt catalysts have great potential for oxidation reactions and industrial applications such as vehicle emission control. These applications can be greatly benefited by tailoring this catalyst to meet their specific requirements. Single-atom catalysts have the highest atom efficiency and can have superior reactivity and selectivity. The synthesis of a ceria-supported Pt single-atom catalyst by methods that can be used in an industrial setup and scale is very important. This dissertation reports the synthesis of a thermally stable ceria-supported Pt single-atom catalyst by high-temperature calcination. Moreover, the limits in the amount of Pt that can be stabilized as single atoms and the anchoring sites for Pt single atoms are also discussed. Activation of the ceria-supported Pt single-atom catalyst to achieve high activity at low temperature for CO oxidation is presented and the catalyst characteristics affecting the activity are also discussed. Finally, a synthesis method is presented to stabilize Pt as single atoms on ceria which can remain stable at high temperature not only under oxidizing conditions but also reducing conditions while still exhibiting high activity for low-temperature CO oxidation.
Author: Xavier Isidro Pereira Hernandez
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 268
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Book Description
Ceria-supported Pt catalysts have great potential for oxidation reactions and industrial applications such as vehicle emission control. These applications can be greatly benefited by tailoring this catalyst to meet their specific requirements. Single-atom catalysts have the highest atom efficiency and can have superior reactivity and selectivity. The synthesis of a ceria-supported Pt single-atom catalyst by methods that can be used in an industrial setup and scale is very important. This dissertation reports the synthesis of a thermally stable ceria-supported Pt single-atom catalyst by high-temperature calcination. Moreover, the limits in the amount of Pt that can be stabilized as single atoms and the anchoring sites for Pt single atoms are also discussed. Activation of the ceria-supported Pt single-atom catalyst to achieve high activity at low temperature for CO oxidation is presented and the catalyst characteristics affecting the activity are also discussed. Finally, a synthesis method is presented to stabilize Pt as single atoms on ceria which can remain stable at high temperature not only under oxidizing conditions but also reducing conditions while still exhibiting high activity for low-temperature CO oxidation.
Author: Nicholas A. Pantelis
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Research into atomically-dispersed metal catalysts on metal-oxide supports like ceria and alumina has grown significantly due to these catalysts' increased performance relative to bulk, nanoparticle, and sub-nanometer metal catalysts. Atomically dispersed, single atom catalysts have been shown to increase the specific activity of metal catalysts on metal-oxide supports. This study mainly focuses on difference in kinetic behavior of single-atom palladium, platinum, and nickel adatoms supported on ceria support during the oxidation of carbon monoxide. The relationship between metal weight-loading on a ceria support, reactor temperature, and reaction order was described. Bimetallic single atom catalysts of palladium and platinum on ceria were studied to compare to monometallic systems in terms of activity. Catalysts were characterized using ICP and CO-DRIFTS analysis, and a differential packed-bed reactor was used carry out the oxidation reaction; the effluent stream was analyzed using a GC to determine reaction kinetics. It was determined that CO binds most strongly to Pt, followed by Pd, and then Ni. The transition from single atom to sub-nanometer nanoparticles or nanoparticles shows a decrease in specific activity with increasing weight loading. At relatively larger weight loadings, for each metal, the order in CO transitions from above 1 to 0 (or slightly negative), while the order in O2 transitions from slightly negative or 0 to above 1. Pd, Pt, and Ni, at similar nominal weight loadings, have similar activities in different temperature ranges; this observation shows CO poisons the metal site but does not explain why at low weight loadings the order in CO increases above 1. Binding energies between metals and ceria as well as metal and CO may explain this observation. Bimetallic Pd/Pt catalysts seem to show apparent synergy due to the fact that the activation energy decreases well below the activation energy of monometallic systems of Pd and Pt.
Author: Yulian He
Publisher: Frontiers Media SA
ISBN: 2832517722
Category : Science
Languages : en
Pages : 119
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Book Description
Author: Philippe Serp
Publisher: Wiley-VCH
ISBN: 9783527348442
Category : Technology & Engineering
Languages : en
Pages : 688
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Book Description
b”Supported Metal Single Atom CatalysisCovers all key aspects of supported metal single atom catalysts, an invaluable resource for academic researchers and industry professionals alike Single atom catalysis is one of the most innovative and dynamic research areas in catalysis science. Supported metal catalysts are used extensively across the chemical industry, ranging from fine and bulk chemical production to petrochemicals. Single atom catalysts (SACs) combine the advantages of both homogeneous and heterogeneous catalysts such as catalyst stability, activity, and high dispersion of the active phase. Supported Metal Single Atom Catalysis provides an authoritative and up-to-date overview of the emerging field, covering the synthesis, preparation, characterization, modeling, and applications of SACs. This comprehensive volume introduces the basic principles of single atom catalysis, describes metal oxide and carbon support materials for SAC preparation, presents characterization techniques and theoretical calculations, and discusses SACs in areas including selective hydrogenation, oxidation reactions, activation of small molecules, C-C bond formation, and biomedical applications. Highlights the activity, selectivity, and stability advantages of supported metal SACs compared to other heterogeneous catalysts Covers applications of SACs in thermal catalysis, electrocatalysis, and photocatalysis Includes chapters on single atom alloys and supported double and triple metal atom catalysts Discusses the prospects, challenges, and potential industrial applications of SACs Supported Metal Single Atom Catalysis is an indispensable reference for all those working in the fields of catalysis, solid-state chemistry, materials science, and spectroscopy, including catalytic chemists, organic chemists, electrochemists, theoretical chemists, and industrial chemists.
Author: Kenneth I. Ozoemena
Publisher: Springer
ISBN: 3319299301
Category : Science
Languages : en
Pages : 583
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Book Description
Global experts provide an authoritative source of information on the use of electrochemical fuel cells, and in particular discuss the use of nanomaterials to enhance the performance of existing energy systems. The book covers the state of the art in the design, preparation, and engineering of nanoscale functional materials as effective catalysts for fuel cell chemistry, highlights recent progress in electrocatalysis at both fuel cell anode and cathode, and details perspectives and challenges in future research.
Author: Radoslav Adzic
Publisher: Springer Nature
ISBN: 3030495663
Category : Science
Languages : en
Pages : 174
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Book Description
This book describes a science and technology of a new type of electrocatalysts consisting of a single atomic layer of platinum on suitable supports. This development helped overcome three major obstacles—catalysts‘ cost, activity, and stability—for a broad range of fuel cell applications. The volume begins with a short introduction to the science of electrocatalysis, covering four reactions important for energy conversion in fuel cells. A description follows of the properties of metal monolayers on electrode surfaces, and underpotential deposition of metals. The authors then describe the concept of Pt monolayer electrocatalysts and its implications and their synthesis by galvanic displacement of less-noble metal monolayers and other methods. The main part of the book presents a discussion of catalysts’ characterization and catalytic properties of Pt monolayers for the four main reactions of electrochemical energy conversion: oxygen reduction and oxidation of hydrogen, methanol and ethanol. The book concludes with a treatment of scale-up syntheses, fuel cell tests, catalysts’ stability and application prospects.
Author: Pascal Granger
Publisher: John Wiley & Sons
ISBN: 3527337636
Category : Technology & Engineering
Languages : en
Pages : 1050
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Book Description
This comprehensive handbook and ready reference details all the main achievements in the field of perovskite-based and related mixed-oxide materials. The authors discuss, in an unbiased manner, the potentials as well as the challenges related to their use, thus offering new perspectives for research and development on both an academic and industrial level. The first volume begins by summarizing the different synthesis routes from molten salts at high temperatures to colloidal crystal template methods, before going on to focus on the physical properties of the resulting materials and their related applications in the fields of electronics, energy harvesting, and storage as well as electromechanics and superconductivity. The second volume is dedicated to the catalytic applications of perovskites and related mixed oxides, including, but not limited to total oxidation of hydrocarbons, dry reforming of methane and denitrogenation. The concluding section deals with the development of chemical reactors and novel perovskite-based applications, such as fuel cells and high-performance ceramic membranes. Throughout, the contributions clearly point out the intimate links between structure, properties and applications of these materials, making this an invaluable tool for materials scientists and for catalytic and physical chemists.
Author: Dennis W. Hess
Publisher:
ISBN:
Category : Language Arts & Disciplines
Languages : en
Pages : 572
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Book Description
Although chemical engineering principles are at the heart of solid state process technology, until now no reference volume addressing this relationship was available. This is the first book of its kind to tie fundamental engineering concepts to solid state process technology. Discussing the basic concepts involved--liquid-phase epitaxy, physical and chemical vapor deposition, diffusion and oxidation in silicon, resists in microlithography, etc.--this volume will be particularly useful in chemical engineering courses. It offers a framework within which specialized courses in microelectronics processing can be organized. In addition, it serves as a valuable reference source for all industrial engineers working with the individual process steps covered.
Author: Prashanth W. Menezes
Publisher: Elsevier
ISBN: 0323952380
Category : Technology & Engineering
Languages : en
Pages : 270
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Book Description
Single Atom Catalysts: Design, Synthesis, Characterization, and Applications in Energy focuses on the synthesis, design and advanced characterization techniques for single atom catalyst materials and their direct energy conversion and storage applications. This book reviews emerging applications of single atom catalysts in fuel cells, batteries, water splitting, carbon dioxide reduction, and nitrogen fixation. Both noble metal and non-noble metal single atom catalysts (SACs) are discussed as noble metal-based SACs are highly efficient and non-noble metal-based SACs might have lower associated costs. There is an emphasis on materials design focused on improving performance of catalysts based on overall catalytic activity, selectivity and stability. Specific parameters that impact this performance are emphasized throughout the book, including single metal atom stabilization, metal-support interactions and the coordination environment. - Discusses the different intricate design and synthesis methods pertaining to various noble and non-noble metal-based SACs - Provides in-depth understanding about the structural, morphological, and physicochemical characterization techniques of synthesized SACs with data analysis and interpretation - Describes state-of-the-art applications of SACs in renewable energy generation and their conversion, storage, and associated challenges
Author: Jens K. Nørskov
Publisher: John Wiley & Sons
ISBN: 1118888952
Category : Technology & Engineering
Languages : en
Pages : 228
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Book Description
This book is based on a graduate course and suitable as a primer for any newcomer to the field, this book is a detailed introduction to the experimental and computational methods that are used to study how solid surfaces act as catalysts. Features include: First comprehensive description of modern theory of heterogeneous catalysis Basis for understanding and designing experiments in the field Allows reader to understand catalyst design principles Introduction to important elements of energy transformation technology Test driven at Stanford University over several semesters
