Design and Characterization of Zeolite Supported Cobalt Carbonyl Catalysts PDF Download

Author: Melissa Clare Connaway
Publisher:
ISBN:
Category : Carbonyl compounds
Languages : en
Pages : 224

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Book Description

Author: Miki Niwa
Publisher: Springer Science & Business Media
ISBN: 3642126200
Category : Science
Languages : en
Pages : 189

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Book Description
Catalysis and catalyst is a key technology to solve the problems in energy and environment issues to sustain our human society. We believe that comprehensive understanding of the catalysis and catalyst provides us a chance to develop a new catalyst and contributes greatly to our society. However, the ?eld of heterogeneous catalyst is dif?cultto study andstill stays behindmoredeveloped?elds ofchemistry such as organic and physical chemistries. This is a dilemma to the chemists who study the catalysis and catalyst. While we can accomplish the progress in the - dustrial application, the scienti?c understandingis not complete yet. A gap between the useful application and incomplete scienti?c understanding, however, becomes smaller and smaller in recent years. Because zeolites are ?ne crystals, and the structure is clearly known, the study on the catalysis using the zeolites is easier than those encountered in other catalysts such as metals and metal oxides. Very fortunately, zeolites provide us the strong acidity with the ?ne distribution which enables various useful catalytic reactions. When some metals and cations are loaded in close to the acid sites, these loadede- ments show extraordinarycharacters, and many catalytic reactions proceed thereon.

Author: Arthur W. Chester
Publisher: Springer Science & Business Media
ISBN: 140209678X
Category : Science
Languages : en
Pages : 372

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Book Description
The idea for putting together a tutorial on zeolites came originally from my co-editor, Eric Derouane, about 5 years ago. I ?rst met Eric in the mid-1980s when he spent 2 years working for Mobil R&D at our then Corporate lab at Princeton, NJ. He was on the senior technical staff with projects in the synthesis and characterization of new materials. At that time, I managed a group at our Paulsboro lab that was responsible for catalyst characterization in support of our catalyst and process development efforts, and also had a substantial group working on new material synthesis. Hence, our interests overlapped considerably and we met regularly. After Eric moved back to Namur (initially), we maintained contact, and in the 1990s, we met a number of times in Europe on projects of joint interest. It was after I retired from ExxonMobil in 2002 that we began to discuss the tutorial concept seriously. Eric had (semi-)retired and lived on the Algarve, the southern coast of Portugal. In January 2003, my wife and I spent 3 weeks outside of Lagos, and I worked parts of most days with Eric on the proposed content of the book. We decided on a comprehensive approach that ultimately amounted to some 20+ chapters covering all of zeolite chemistry and catalysis and gave it the title Zeolite Chemistry and Catalysis: An integrated Approach and Tutorial.

Author: Richard J. C. Osbaldiston
Publisher:
ISBN:
Category : Cobalt catalysts
Languages : en
Pages : 286

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Book Description

Author: Feng-Shou Xiao
Publisher: Springer
ISBN: 366247395X
Category : Science
Languages : en
Pages : 490

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Book Description
This book is devoted to the new development of zeolitic catalysts with an emphasis on new strategies for the preparation of zeolites, novel techniques for their characterization and emerging applications of zeolites as catalysts for sustainable chemistry, especially in the fields of energy, biomass conversion and environmental protection. Over the years, energy and the environment have become the most important global issues, while zeolitic catalysts play important roles in addressing them. With individual chapters written by leading experts, this book offers an essential reference work for researchers and professionals in both academia and industry. Feng-Shou Xiao is a Professor at the Department of Chemistry, Zhejiang University, China. Xiangju Meng is an Associate Professor at the Department of Chemistry, Zhejiang University, China.

Author: Masakazu Anpo
Publisher: Nova Publishers
ISBN: 9781560728016
Category : Science
Languages : en
Pages : 252

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Book Description
This new century will be an age in which humanity will strive for the recovery and preservation of a more natural environment and also for the establishment of clean and safe energy supply technologies. Up until now, environmental pollution and destruction on a global scale as well as the lack of sufficient clean energy have drawn great attention and concern to the vital need for totally new environmentally friendly, ecologically clean chemical technology, materials and processes -- the most important challenge facing chemical scientists for future generations. In this respect, zeolites offer very unique and interesting physicochemical properties such as a pore structure of a molecular scale, ion-exchange capabilities, a strong surface acidity and a unique internal surface topology. It would, therefore, be of great significance to develop well-defined molecular scale catalysts within zeolite cavities and frameworks which would lead to the design of more active and selective photofunctional and photocatalytic systems, particularly systems able to utilise the very abundant solar energy and convert them into safe and useful chemical energy. The central topics of this book is how to utilise photofunctional zeolites for applications in the recovery and preservation of our environment while, at the same time, trying to develop clean and safe energy supply technologies. A vital new era is emerging in the utilisation of the most limitless, clean and efficient energy source -- the sun by applying photofunctional materials. Research on photofunctional zeolites is only the beginning in the harvesting of this vast and powerful energy source not only to develop clean and safe photochemical processes and systems for industry but also to develop systems that can eliminate and cleanse the many devastating toxic agents that are polluting our environment.

Author: Subhash Bhatia
Publisher: CRC Press
ISBN: 100009863X
Category : Science
Languages : en
Pages : 302

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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: Ceren Aydin
Publisher:
ISBN: 9781267967282
Category :
Languages : en
Pages :

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Book Description
In a search for a fundamental understanding of supported catalysts, supported metal catalysts with essentially molecular structures were synthesized by anchoring organometallic precursors with well-defined structures to uniform and highly crystalline supports. The supports include zeolite NaY, zeolite HSSZ-53 and MgO. The metals include osmium, iridium, and gold, and the corresponding precursors were Os3(CO)12, Ir(C2H4)2(acac), Ir(CO)2(acac), and Au(CH3)2(acac). Characterization of the supported species at the atomic scale was carried out by X-ray absorption (XAS) and infrared (IR) spectroscopies used in tandem with aberration-corrected scanning transmission electron microscopy (STEM). The transformations of these species were tracked, with the data taken under (a) working conditions of a catalyst (during a reaction), (b) in the presence of a reactive atmosphere, or (c) under the influence of the electron beam in the STEM. Time-resolved spectra and images demonstrate the structural changes in the catalysts involving the nuclearity of the metal species, the metal-ligand and metal-support interactions. Fully resolved structures were correlated with catalytic activity for ethylene hydrogenation and CO oxidation reactions. Influence of channel confinement and cage dimensions of a zeolite on cluster formation were investigated starting with Ir1 species. First steps of cluster formation giving Ir2 and Ir3 were tracked in 1D channels of zeolite HSSZ-53 and formation of Ir6 species in 3D supercages of zeolite NaY was examined. Moreover, last steps of cluster growth were revealed by the discovery a sinter-resistant catalyst with a critical diameter of ~1 nm (Ir~40). Characterization with single atom sensitivity help pinpoint atomically dispersed gold catalytic sites on zeolite NaY during CO oxidation and site-isolated Os(CO)2 species formed by fragmentation of Os3 carbonyls on MgO surface. The results show how fundamental understanding can guide the design of catalysts incorporating metal atoms in nanoscale spaces or on surfaces and help unravel the transport of metal atoms and characterize the bonding sites for catalytic species.

Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 872

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Author: Helen Yu Luo
Publisher:
ISBN:
Category :
Languages : en
Pages : 290

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Book Description
The development of carbon efficient and economically viable biomass conversion technologies is crucial for the sustainable production of fuels and chemicals. Catalytic upgrading processes must remove oxygen and add hydrogen while targeting oxygen-containing functional groups. Catalysts must be water-tolerant, stable under hydrothermal conditions, and accessible for large organics. Zeolites are active and selective heterogeneous catalysts used in many industrial processes. Their microporous crystalline frameworks composed of tetrahedral silicate offer shape selectivity and high stability. Heteroatoms such as Sn or A1 can be incorporated into these frameworks to create isolated Lewis and Brønsted acid sites. This thesis uses synthesis, characterization, and reactivity studies to develop novel zeolite acid catalysts for upgrading biomass platform molecules. The first section focuses on designing hierarchical Brønsted acid zeolites to catalyze bulky molecules. A1-containing zeolite nanosheets of single-unit-cell thickness are synthesized using diquarternary ammonium surfactants. Characterization reveals high external surface area and mesoporosity and strong external acid sites. MFI nanosheets have higher stability and selectivity to larger olefins and aromatics in the conversion of propanal to hydrocarbons due to shorter diffusion path lengths compared to bulk MFI zeolite. MWW nanosheets have a three-fold increase in catalytic activity for the alkylation of benzene with benzyl alcohol compared to bulk MWW zeolite. Sn-containing MFI nanosheets are synthesized for the first time and are shown to have higher activity for the Baeyer-Villiger oxidation of bulky ketones than bulk Sn-MFI zeolite, and higher stability than mesoporous, amorphous Sn silicates. The second section focuses on studying and characterizing hydrophobic, water-tolerant Lewis acid zeolites. A detailed kinetics study compares transfer hydrogenation activity of Ti-, Sn-, Zr-, Hf-containing BEA zeolites with different hydrogen donors. A new characterization method using trimethylphosphine oxide probes and NMR is created to deduce structure-activity relationships. Finally, an integrated catalytic process is developed for the efficient production of [gamma]-valerolactone from furfural through sequential transfer hydrogenation and hydrolysis reactions catalyzed by a mixture of Brønsted acid zeolite nanosheets and hydrophobic Lewis acid zeolites. Overall, this thesis demonstrates that a detailed understanding of the structure and active sites in zeolite acid catalysts can allow us to design more efficient catalytic processes.