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Author: J. H. Lunsford Publisher: ISBN: Category : Languages : en Pages : 9
Book Description
The regular cavities within zeolite form a unique environment for carrying out both stoichiometric and catalytic oxidation reactions. Transition metal ions such as molybdenum and cobalt may be introduced into zeolites, where they form complexes with oxidants and substrate ligands. The objectives of the research were (a) to understand oxidation reactions in zeolites at a molecular level and (b) to evaluate the potential of zeolites as catalysts in selective oxidation reactions.
Author: J. H. Lunsford Publisher: ISBN: Category : Languages : en Pages : 9
Book Description
The regular cavities within zeolite form a unique environment for carrying out both stoichiometric and catalytic oxidation reactions. Transition metal ions such as molybdenum and cobalt may be introduced into zeolites, where they form complexes with oxidants and substrate ligands. The objectives of the research were (a) to understand oxidation reactions in zeolites at a molecular level and (b) to evaluate the potential of zeolites as catalysts in selective oxidation reactions.
Author: Gabriele Centi Publisher: Springer Science & Business Media ISBN: 9401007829 Category : Science Languages : en Pages : 331
Book Description
Atomically dispersed metal cations and small polyatomic cationic structures co-ordinated to the surface of porous matrices exhibit different properties from the same cationic species contained in a bulk oxide or supported on amorphous carriers. This subject is treated to an extensive review, showing how an understanding of it is essential to the development of a new generation of solid catalysts. There are also exciting opportunities to shape the catalytic properties of the transition metal cations in microporous and mesoporous matrices. The book covers both theoretical and experimental aspects, including the distribution of framework Al atoms in Si-rich zeolites, distribution and siting of charge-exchanged metal cations, electronic, adsorptive and catalytic properties of metal cations, and correlation of metal cation structure and siting with catalytic activity.
Author: Joaquín Pérez Pariente Publisher: Springer ISBN: 3319989057 Category : Science Languages : en Pages : 316
Book Description
This volume provides the reader with the most up-to-date and relevant knowledge on the reactivity of metals located in zeolite materials, either in framework or extra-framework positions, and the way it is connected with the nature of the chemical environment provided by the host. Since the first report of the isomorphous substitution of titanium in the framework of zeolites giving rise to materials with unusual catalytic properties, the incorporation of many other metals have been investigated with the aim for developing catalysts with improved performance in different reactions. The continuous expansion of the field, both in the variety of metals and zeolite structures, has been accompanied by an increasing focus on the relationship between the reactivity of metal centers and their unique chemical environment. The concepts covered in this volume are of interest to people working in the field of inorganic and physical chemistry, catalysis and chemical engineering, but also for those more interested in theoretical approaches to chemical reactivity. In particular the volume is useful to postgraduate students conducting research in the design, synthesis and catalytic performance of metal-containing zeolites in both academic and application contexts.
Author: O. V. Altshuler Publisher: ISBN: Category : Languages : en Pages : 24
Book Description
The authors have investigated the catalytic activity of Y-type zeolite, containing cations of transition metals of the IV period - Mn(2+), Fe(3+), Co(2+), Ni(2+), Cu(2+), Cr(3+), and also Ag(+). As reactions for comparing the catalytic activity of zeolites they selected the reactions of hydrogen, carbon monoxide, ammonia, and ethylene oxidation.
Author: Subhash Bhatia Publisher: CRC Press ISBN: 100009863X Category : Science Languages : en Pages : 302
Book Description
Presented in an easy-to-read form, this book on zeolite catalysis cover all aspects of the subject. It focuses on synthesis, structure, diffusion, deactivation, and industrial applications. This book is an ideal text for courses on catalysis or as a supplementary text for those studying applied or industrial chemistry. It is also a useful resource for anyone who works with zeolites as catalysts in the laboratory, pilot plants, or commercial installations.
Author: H.H. Kung Publisher: Elsevier ISBN: 0080887422 Category : Science Languages : en Pages : 299
Book Description
In this book the author presents an up-to-date summary of existing information on the structure, electronic properties, chemistry and catalytic properties of transition metal oxides. The subjects covered in the book can be divided into three sections. The first (chapters 1 to 3) covers the structural, physical, magnetic, and electronic properties of transition metal oxides. Although the emphasis is on surface properties, relevant bulk properties are also discussed. The second section (chapters 4 to 7) covers surface chemical properties. It includes topics that describe the importance of surface coordinative unsaturation in adsorption, the formation of surface acidity and the role of acidity in determining surface chemical properties, the nature and reactivities of adsorbed oxygen, and the surface chemistry in the reduction of oxides. The third section (chapters 8 to 14) is on the catalytic properties. Various catalytic reactions including decomposition, hydrogenation, isomerization, metathesis, selective oxidation, and reactions involving carbon oxides are discussed. Emphasis is placed more on reaction mechanisms and the role of catalysts than on kinetics and processes. Chapters on the preparation of oxide catalysts and on photo-assisted processes are also included. Whenever appropriate, relationships between various topics are indicated. Written for surface physicists, chemists, and catalytic engineers, the book will serve as a useful source of information for investigators and as a comprehensive overview of the subject for graduate students.
Author: Jens Weitkamp Publisher: Springer Science & Business Media ISBN: 3662037645 Category : Science Languages : en Pages : 582
Book Description
Zeolites occur in nature and have been known for almost 250 years as alumino silicate minerals. Examples are clinoptilolite, mordenite, offretite, ferrierite, erionite and chabazite. Today, most of these and many other zeolites are of great interest in heterogeneous catalysis, yet their naturally occurring forms are of limited value as catalysts because nature has not optimized their properties for catalytic applications and the naturally occurring zeolites almost always contain undesired impurity phases. It was only with the advent of synthetic zeolites in the period from about 1948 to 1959 (thanks to the pioneering work of R. M. Barrer and R. M. Milton) that this class of porous materials began to playa role in catalysis. A landmark event was the introduction of synthetic faujasites (zeolite X at first, zeolite Y slightly later) as catalysts in fluid catalytic cracking (FCC) of heavy petroleum distillates in 1962, one of the most important chemical processes with a worldwide capacity of the order of 500 million t/a. Compared to the previously used amorphous silica-alumina catalysts, the zeolites were not only orders of magnitude more active, which enabled drastic process engineering improvements to be made, but they also brought about a significant increase in the yield of the target product, viz. motor gasoline. With the huge FCC capacity worldwide, the added value of this yield enhancement is of the order of 10 billion US $ per year.
Author: J. H. Lunsford
Author: J. H. Lunsford
Author: Gabriele Centi
Author: Joaquín Pérez Pariente
Author: Dénes Kalló
Author: O. V. Altshuler
Author: Subhash Bhatia
Author: H.H. Kung
Author: Georgiĭ Konstantinovich Boreskov
Author: Luis M. Aparicio
Author: Jens Weitkamp