Mechanisms of Iron-based Catalysts Investigated Using Model Compounds PDF Download
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Languages : en
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Languages : en
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Languages : en
Pages : 5
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The catalytic mechanism of highly active, nanophase, iron-based coal liquefaction catalysts was investigated using a series of model compounds. The iron-oxide phases ferric oxyhydroxysulfate (OHS), 6-line ferrihydrite, hematite, and goethite, were evaluated as catalyst precursors with systematically substituted diphenylmethanes in the presence of a hydrogen donating solvent. The activity of the catalysts was observed to be dependent upon the functionality on the model compounds. The results of these model compound studies and their relationship to possible reaction mechanisms are presented.
Author: Eike Bauer
Publisher: Springer
ISBN: 3319193961
Category : Science
Languages : en
Pages : 367
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Book Description
The series Topics in Organometallic Chemistry presents critical overviews of research results in organometallic chemistry. As our understanding of organometallic structure, properties and mechanisms increases, new ways are opened for the design of organometallic compounds and reactions tailored to the needs of such diverse areas as organic synthesis, medical research, biology and materials science. Thus the scope of coverage includes a broad range of topics of pure and applied organometallic chemistry, where new breakthroughs are being achieved that are of significance to a larger scientific audience. The individual volumes of Topics in Organometallic Chemistry are thematic. Review articles are generally invited by the volume editors.
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Languages : en
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Inexpensive catalysts for coal liquefaction must be developed if this process is to become economically viable. Recent emphasis has been on the use of iron-based catalysts, either in the form of nanometer-sized oxides and sulfides, or organic or water soluble compounds which have been used to impregnate the coal with dispersed iron species. In almost all cases the active form of the iron catalyst has been generated in-situ at reaction conditions in the presence of sulfur. Observation of enhanced activity with the use of sulfur and the appearance of iron-sulfides both during and after the liquefaction reactions have led to the suggestion that an iron-sulfide is the catalytically active species. In this study we investigated the effect of iron-oxyhydroxide catalyst precursor phase on the bond scission ability of the catalysts produced in-situ in the presence of sulfur with the model compounds naphthyl bibenzylmethane (NBBM), bibenzyl (BB), diphenylmethane (DPM) and dibenzothiophene (DBT). The catalyst precursors investigated were ferric oxyhydroxysulfate (OHS), goethite ([alpha]-FeOOH), akaganeite ([beta]-FeOOH) and six-line ferrihydrite. These precursors were chosen for their enhanced activity for carbon-carbon bond scission with NBBM over other iron-oxyhydroxides and iron-oxides. The reactions of these catalyst precursors with the model compounds were investigated both with and without a hydrogen-donating solvent.
Author: Wilson D. Shafer
Publisher: MDPI
ISBN: 303928388X
Category : Science
Languages : en
Pages : 414
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Book Description
Since the turn of the last century when the field of catalysis was born, iron and cobalt have been key players in numerous catalysis processes. These metals, due to their ability to activate CO and CH, haev a major economic impact worldwide. Several industrial processes and synthetic routes use these metals: biomass-to-liquids (BTL), coal-to-liquids (CTL), natural gas-to-liquids (GTL), water-gas-shift, alcohol synthesis, alcohol steam reforming, polymerization processes, cross-coupling reactions, and photocatalyst activated reactions. A vast number of materials are produced from these processes, including oil, lubricants, waxes, diesel and jet fuels, hydrogen (e.g., fuel cell applications), gasoline, rubbers, plastics, alcohols, pharmaceuticals, agrochemicals, feed-stock chemicals, and other alternative materials. However, given the true complexities of the variables involved in these processes, many key mechanistic issues are still not fully defined or understood. This Special Issue of Catalysis will be a collaborative effort to combine current catalysis research on these metals from experimental and theoretical perspectives on both heterogeneous and homogeneous catalysts. We welcome contributions from the catalysis community on catalyst characterization, kinetics, reaction mechanism, reactor development, theoretical modeling, and surface science.
Author: Bernd Plietker
Publisher: John Wiley & Sons
ISBN: 3527623280
Category : Science
Languages : en
Pages : 295
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Book Description
This first comprehensive book to cover this exciting field also deals with the biological aspects, such as enzymes with iron. Following an introduction, this handy reference and handbook goes on to deal with reductions, oxidations of C, H- and C=C bonds, oxidative allylic oxygenation and amination, the oxidation of heteroatoms, cross coupling reactions, aromatic and nucleophilic substitutions, addition to carbonyl compounds, and cyclisations as well as ring opening reactions. The chapters are clearly classified according to the reaction type, allowing readers to quickly locate the desired information.
Author: T.H. Fleisch
Publisher: Elsevier
ISBN: 0080537316
Category : Technology & Engineering
Languages : en
Pages : 577
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Book Description
This volume contains peer-reviewed manuscripts describing the scientific and technological advances presented at the 6th Natural Gas Conversion Sumposium held in Alaska in June 2001. This symposium continues the tradition of excellence and the status as the premier technical meeting in this area established by previous meetings. The 6th Natural Gas Conversion Symposium is conducted under the overall direction of the Organizing Committee. The Program Committee was responsible for the review, selection, editing of most of the manuscripts included in this volum. A standing International Advisory Board has ensured the effective long-term planning and the continuity and technical excellence of these meetings.
Author: Manas Sutradhar
Publisher: MDPI
ISBN: 3036510621
Category : Science
Languages : en
Pages : 68
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Book Description
Catalysts play a crucial role in the path towards the transformation of organic compounds. This book describes the recent development of metal-based catalysis in organic synthesis. Applications of various catalysts to interesting organic transformations are discussed. It covers important organic reactions such as cyclohexane oxidation under different energy stimuli, use of Pd-nanoparticles for carbonylation of aniline, ammoximation of methyl ethyl ketone by Ni-modified TS-1 and carbozincation of substituted 2-alkynylamines. This book will be a useful reference for researchers in the field of catalysis, organic chemistry and materials science. It is also intended to attract the attention of researchers with an industrial interest.
Author: Bernd Plietker
Publisher: Springer Science & Business Media
ISBN: 3642146694
Category : Science
Languages : en
Pages : 227
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Book Description
Juan I. Padrón and Víctor S. Martín: Catalysis by means of Fe-based Lewis acids; Hiroshi Nakazawa*, Masumi Itazaki: Fe–H Complexes in Catalysis; Kristin Schröder, Kathrin Junge, Bianca Bitterlich, and Matthias Beller: Fe-catalyzed Oxidation Reactions of Olefins, Alkanes and Alcohols: Involvement of Oxo- and Peroxo Complexes; Chi-Ming Che, Cong-Ying Zhou, Ella Lai-Ming Wong: Catalysis by Fe=X Complexes (X=NR, CR2); René Peters, Daniel F. Fischer and Sascha Jautze: Ferrocene and Half Sandwich Complexes as Catalysts with Iron Participation; Markus Jegelka, Bernd Plietker: Catalysis by Means of Complex Ferrates.
Author: Jose M Palomo
Publisher: World Scientific
ISBN: 1786349639
Category : Science
Languages : en
Pages : 350
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Book Description
Iron Catalysis: Design and Applications is an exciting new book that takes readers inside the world of iron catalysis guided by international catalysis expert, Dr Jose M Palomo. Iron is the most abundant metal in the planet, cost-effective, environmentally friendly, with an easily manipulated remediation process. In the last few years the use of this nonprecious metal has gained extraordinary attention particularly for its potential as a catalyst in different areas. This book compiles a series of chapters describing the most significant advances in the last few years since the design of different iron catalysts and nanocatalysts and iron-containing artificial and natural enzymes. The chapters also cover its application in different areas of interest such as organic synthesis, environmental remediation, enzyme-like activities or the creation of novel types of electrodes for battery design.
