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.
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Professor Christian Hess is at the Technical University of Darmstadt. He was Humboldt Fellow at Texas A&M University, Otto Hahn Fellow of the Max Planck Society at the University of California at Berkeley and in the Lawrence Berkeley National Laboratory, and Emmy Noether Fellow of the German Research Foundation at the Fritz Haber Institute in Berlin. Since 2010 he is director of the Eduard Zintl Institute for Inorganic and Physical Chemistry at the Technical University of Darmstadt. He is the author of over 60 publications and patents in the area of surface chemistry and catalysis. His research activities are devoted to the synthesis, characterization and application of nanostructured materials for catalysis, sensing and energy storage with a strong focus on the development and use of in situ spectroscopic techniques. Professor Robert Schl÷gl is in the Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Berlin, and has been Director at the Fritz Haber Institute of the Max Planck Society since 1994. His achievements include: Guest Professorship, UniversitÚ Louis Pasteur, Honorary Professorship at the Technical University Berlin and the Humboldt University Berlin, Tetelman Fellow, Yale University, and a Fellow of the Royal Society of Chemistry. He is also the author of over 507 publications, 8 families of patents and patent applications, with 184 presentations and invited talks.
The book gives a comprehensive summary of the existing information on the structural/electronic properties, chemistry and catalytic properties of vanadium and molybdenum containing catalysts. As at least one of these two elements is essential to most partial oxidation catalysts the book is of great interest to advanced students of catalysis and researchers both in academia and industry. Despite major developments in the field, the last book with a similar scope was published in 1989 and therefore a new book is overdue. The book benefits largely from the fact that the subject is a major research focus at the Department of Inorganic Chemistry amongst other departments at the Fritz Haber Institute, a world leading institution for catalysis research, ensuring an up-to-date treatise. Such an integrated approach including the relation of in situ spectroscopic results from real catalysts to those of model catalytic systems has not been accomplished before. The introductory chapter discusses the importance of nanoscience for the controlled synthesis of catalysts with functional properties. The following two chapters introduce the necessary background regarding surface properties and preparation techniques, leading from a textbook level to the current state of knowledge. The following chapter starts with an extensive survey and analysis of the existing open and patent literature, which is an essential knowledge source for the development of the new generation of partial oxidation catalysts and will be of particular value to those developing new partial oxidation catalysts. In the remaining subchapters, 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. These results are related to those of the real catalytic systems. The last chapter gives an outlook on research opportunities within the area of partial oxidation reactions.
Chapter 1 Introduction Christian Hess, 1,
Chapter 2 C–H Activation of Alkanes in Selective Oxidation Reactions on Solid Oxide Catalysts Johannes A. Lercher and Frederik N. Naraschewski, 5,
Section I Oxide-Catalyzed Selective Oxidations of Light Hydrocarbons (Chapters 3–7),
Chapter 3 Catalysis of Oxidative Methane Conversions Evgenii V. Kondratenko and Manfred Baerns, 35,
Chapter 4 Propane-Selective Oxidation to Acrylic Acid Annette Trunschke, 56,
Chapter 5 Ammoxidation of Propylene and Propane to Acrylonitrile Robert K. Grasselli, 96,
Chapter 6 Selective Oxidation of n-Butane over Vanadium–Phosphorous Oxide Moises A. Carreon and Vadim V. Guliants, 141,
Chapter 7 Routes to Methacrylic Acid via Partial Oxidation Stephan A. Schunk and Nadine Brem, 169,
Section II Other Selective Oxidations (Chapters 8–11),
Chapter 8 Gold as a Selective Oxidation Catalyst Graham J. Hutchings, 193,
Chapter 9 Ethylene Epoxidation over Silver Catalysts Valerii I. Bukhtiyarov and Axel Knop-Gericke, 214,
Chapter 10 Ruthenium Active Catalytic States: Oxidation States and Methanol Oxidation Reactions Raoul Blume, Michael Hävecker, Spiros Zafeiratos, Detre Techner, Axel Knop-Gericke, Robert Schlögl, Luca Gregoratti, Alexei Barinov and Maya Kiskinova,
248,
Chapter 11 Styrene Synthesis: In-Situ Model Catalysis Studies on Ethylbenzene Dehydrogenation Wolfgang Ranke, 266,
Section III Supported Vanadium-Oxide Systems and Mechanistic Studies (Chapters 12–14),
Chapter 12 Highly Dispersed Vanadium-Oxide Catalysts Christian Hess, 299,
Chapter 13 Surface-Science Models with Chemical Complexity Christian Hess, 326,
Chapter 14 Mechanistic Aspects of Short Contact Time Oxidative Functionalization of Propane and Ethane from Temporal Analysis of Products Evgenii V. Kondratenko, 340,
Chapter 15 Characteristics of Selective Oxidation Reactions Robert Schlögl and Christian Hess, 355,
Chapter 16 Reaction Engineering of Oxidation Reactions Arne Dinse and Reinhard Schomäcker, 398,
Chapter 17 Outlook Christian Hess, 427,
Subject Index, 430,
Introduction
CHRISTIAN HESS
Technische Universität Darmstadt, Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Petersenstr. 20, 64287 Darmstadt, Germany
The production of organic chemicals via heterogeneously catalyzed selective oxidations is one of the most important segments in modern chemical industry. Important products include acrylic acid, acrylonitrile, ethylene oxide, formaldehyde, maleic anhydride, methacrylic acid, and phthalic anhydride. Table 1.1 lists major heterogeneously catalyzed selective oxidation processes discussed within the scope of this book. Due to the high level of empirical development of these processes, further improvements represent a tremendous challenge, which will largely benefit from a mechanistic understanding of selective oxidation catalysts. However, despite extensive research activities over the last decades, still very little is known about the mode of operation of selective oxidation reactions on an atomistic level.
A working catalyst requires an interplay of processes over multiple length- and timescales. With respect to time these range from elementary steps such as the breaking of bonds in the substrate and active site (~100 fs) to transport phenomena as well as solid-state transformations of the catalyst (up to years). Simultaneously, in the course of these processes lengthscales from subnanometers up to meters are covered.
An important aspect of the rational development of more efficient selective oxidation processes is the ability to control the catalyst structure and particle size on the nanometer scale, strongly linking research in heterogeneous catalysis with material science. Such nanostructured catalysts are naturally divided into supported and bulk systems. In general, supported catalysts consist of an oxide support such as Al2O3, SiO2 or TiO2 onto which either metal nanoparticles are deposited or metal-oxide aggregates are grafted forming monolayer-type systems. If reduced to a small number of atoms, such systems may be designed as "single-site" catalysts, which allow for molecular control of the active site and its surrounding environment. Besides, with recent progress in the development of nanostructured (mesoporous) materials, designed regular-pore systems are now available that can serve as support for the anchoring of active sites. The ultimate goal in rational catalyst synthesis is the preparation of catalysts on the basis of identified active-site structures. The synthesis of bulk systems can then be envisioned as assembly of these sites into nanostructured inorganic solids with high surface area, similar to the synthesis of polymers starting from basic building blocks. A special case of bulk systems are heteropoly compounds, which are built on nanoclusters of a central heteroatom caged by oxygen-linked MO6 octahedrons.
While methane and ethylbenzene can be considered as limiting cases of low and high reactivity, respectively, the C2–C4 substrates ethane, propane, propene, butane, isobutene and isobutene (see Table 1.1) due to their similar reactivity behavior in oxidative dehydrogenation and oxidative functionalization form a suitable platform for a discussion of general principles. The type of catalysts used for these reactions are in general vanadium and/or molybdenum containing bulk oxide materials including vanadium phosphorus oxides (VPO), heteropoly compounds (HPC) or mixed-metal oxides (MMO) such as MoV-TeNb oxide. Many supported systems also constitute efficient catalysts for the above processes. However, with the exception of titania supported vanadium oxide (commercially used for benzene/naphthalene to phthalic anhydride conversion) bulk systems give higher yields as compared to supported systems and are therefore the focus of industrial research. Nevertheless, due to their "simplicity" supported systems can give valuable insights into the operation of selective oxidation reactions, as will be shown in detail below.
There exist various reviews and books covering heterogeneously catalyzed selective oxidation reactions. However, the high level of empirical development of many of the above processes strongly contrasts our current level of scientific understanding. It is probably fair to say that the current development of selective oxidation catalysts is largely based on phenomenological concepts (among which the principle of site isolation and the principle of phase cooperation are fundamental) rather than a profound understanding of their mode of operation. To this end, the purpose of this book is to bring together the current state of knowledge on selective oxidation reactions and, by combination with previous findings, to develop a consistent picture of the working principle of selective oxidation catalysts.
Commercially important classes of selective oxidation reactions are the oxidative dehydrogenation of methanol and the epoxidation of ethylene. The epoxidation of propylene has the potential to be commercialized. For these reactions mainly catalysts based on coin metals (Cu, Ag, Au) are used. Ag is a particularly interesting material as it can serve...
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