Zeolite Nanocrystals And Hierarchical Porous Structures Synthesis Characterization And Formation Mechanism

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Zeolite Nanocrystals and Hierarchical Porous Structures: Synthesis, Characterization and Formation Mechanism

Author : Yi Huang
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis Zeolite Nanocrystals and Hierarchical Porous Structures: Synthesis, Characterization and Formation Mechanism by : Yi Huang

Download or read book Zeolite Nanocrystals and Hierarchical Porous Structures: Synthesis, Characterization and Formation Mechanism written by Yi Huang and published by . This book was released on 2011 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Significant effort has been made to synthesize zeolite nanocrystals with controllable crystal sizes and high yield. A number of synthetic strategies involving optimization of hydrothermal conditions and/or composition of synthesis solutions (or gels), and phase transformation have been developed so far. However, controlled synthesis of zeolite nanocrystals still remains one of the difficult tasks in many systems due to their very complex crystallization mechanisms. Especially, in a zeolite synthesis system (clear solution or gel) without using a structure-directing agent (SDA), only a limited success has been achieved in controlling crystal sizes. In this dissertation, a novel synthesis method combining space confined synthesis and templating approach has been developed to prepare zeolite nanocrystals with controlled particle size distributions. This synthetic strategy involves the following steps: selection of colloidal silica nanoparticles; formation of silica-mesoporous carbon composite by in situ polymerization of furfuryl alcohol (FA) in the presence of triblock copolymer-Pluronic P123 and colloidal silica nanoparticles and subsequent carbonization; confined space conversion of silica nanoparticles into zeolite nanocrystals; and sample collection via carbon burn-off. This novel synthesis method allows one to control nanocrystal size and size distribution simply by choosing colloidal silica nanoparticles with a desired particle size distribution.Zeolites with hierarchical porous structures and designed shapes are in high demand for new technological as well as traditional applications (for instance as catalysts or highly selective adsorbents). In this study, hierarchical porous particles (150-600 nm) aggregated by primary NaY zeolite nanocrystals (20-80 nm) have been synthesized without using a secondary template via a newly developed three-stage temperature controlled strategy. The mesoporosity of synthesized particles, possessing a globular crystal-like morphology, can be tuned in the range of 30.8-57.6% by simply varying water contents in the synthesis gels. The mechanistic study of zeolite NaY growth in this organic-free system suggested that the formation mechanism that governed the crystallization process was similar to that reported by Valtchev and Bozhilov, i.e., fast spontaneous aggregation of nanoparticles around a crystallization center, followed by crystallization and agglomeration of larger crystals around these centers. This approach to the preparation of hierarchical porous zeolite particles can be applied to a number of zeolite materials.Core-shell/hollow zeolite NaP particles and macroporous NaP monoliths with designed shapes (such as cylinder, rectangular-prism and donut shapes) have been fabricated by combing the ceramic gel-casting technique and in situ vapour phase transport (VPT) method. It has been found that the employment of aged zeolite gel as the starting material is a prerequisite for the successful formation of NaP zeolite structures. However, by incorporating different amounts of silica nanoparticles in the gel-casting process, one can control the mechanical strength and Si/Al ratio of the resulting zeolitic monoliths. Dispersible and individual hollow NaP zeolite particles with relatively lower Si/Al ratios have been produced in the absence of colloidal silica. Careful analyses of the samples collected after a series of crystallization times revealed that the growth of the core-shell/hollow NaP structures possibly followed a surface-to-core formation process. The fabrication of macroporous zeolite monoliths with functional magnetic Fe3O4 has been presented, demonstrating the feasibility of this synthetic approach for zeolite functionalization.It is well known that the addition of organic additives has an effect on zeolite nucleation and crystallization. The role of ethanol in sodalite crystallization was systematically studied in 3.09Na2O: 1.00Al2O3: 1.08SiO2: 45.5H2O: nC2H6O (nethanol = 0, 3.6, 7.2, 14.5, 29 and 43.5) systems. It has been found that the introduction of ethanol into the gel system significantly facilitated phase transformation from LTA to a denser SOD phase. Moreover, the increase in the amount of ethanol in gel systems has led to the morphological evolution of as-synthesized sodalites from clusters of micro-sized discs to nanoplates assembled thread-ball-like particles, and then to globular polyhedral nanocrystals aggregated core-shell/hollow structures. Importantly, in the system with high ethanol contents (nethanol ≥ 14.5), where core-shell/hollow sodalites were formed, extraordinary phenomena including multiple surface nucleation and crystallization followed by surface-to-core growth, have been observed. Supported by experimental evidence obtained in this work, surface nucleation and crystallization is probably a common process, in particular when an appropriate amount of alcohol is involved in zeolite synthesis.

Chemistry of Zeolites and Related Porous Materials

Author : Ruren Xu
Publisher : John Wiley & Sons
ISBN 13 : 0470822368
Total Pages : 616 pages
Book Rating : 4.4/5 (78 download)

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Book Synopsis Chemistry of Zeolites and Related Porous Materials by : Ruren Xu

Download or read book Chemistry of Zeolites and Related Porous Materials written by Ruren Xu and published by John Wiley & Sons. This book was released on 2009-05-29 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: Widely used in adsorption, catalysis and ion exchange, the family of molecular sieves such as zeolites has been greatly extended and many advances have recently been achieved in the field of molecular sieves synthesis and related porous materials. Chemistry of Zeolites and Related Porous Materials focuses on the synthetic and structural chemistry of the major types of molecular sieves. It offers a systematic introduction to and an in-depth discussion of microporous, mesoporous, and macroporous materials and also includes metal-organic frameworks. Provides focused coverage of the key aspects of molecular sieves Features two frontier subjects: molecular engineering and host-guest advanced materials Comprehensively covers both theory and application with particular emphasis on industrial uses This book is essential reading for researches in the chemical and materials industries and research institutions. The book is also indispensable for researches and engineers in R&D (for catalysis) divisions of companies in petroleum refining and the petrochemical and fine chemical industries.

Mesoporous Zeolites

Author : Javier García-Martínez
Publisher : John Wiley & Sons
ISBN 13 : 3527335749
Total Pages : 608 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Mesoporous Zeolites by : Javier García-Martínez

Download or read book Mesoporous Zeolites written by Javier García-Martínez and published by John Wiley & Sons. This book was released on 2015-05-26 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: Authored by a top-level team of both academic and industrial researchers in the field, this is an up-to-date review of mesoporous zeolites. The leading experts cover novel preparation methods that allow for a purpose-oriented fine-tuning of zeolite properties, as well as the related materials, discussing the specific characterization methods and the applications in close relation to each individual preparation approach. The result is a self-contained treatment of the different classes of mesoporous zeolites. With its academic insights and practical relevance this is a comprehensive handbook for researchers in the field and related areas, as well as for developers from the chemical industry.

Mesoporous Zeolites

Author : Javier García-Martínez
Publisher : John Wiley & Sons
ISBN 13 : 3527673970
Total Pages : 608 pages
Book Rating : 4.5/5 (276 download)

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Book Synopsis Mesoporous Zeolites by : Javier García-Martínez

Synthesis of Zeolite Nanocrystals and Their Application for Mixed Matrix Membranes

Author : Dan Li (Chemical engineer)
Publisher :
ISBN 13 :
Total Pages : 272 pages
Book Rating : 4.:/5 (92 download)

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Book Synopsis Synthesis of Zeolite Nanocrystals and Their Application for Mixed Matrix Membranes by : Dan Li (Chemical engineer)

Download or read book Synthesis of Zeolite Nanocrystals and Their Application for Mixed Matrix Membranes written by Dan Li (Chemical engineer) and published by . This book was released on 2009 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zeolites are a class of microporous solids with well-defined crystalline structures. Due to their ability to distinguish molecules on the basis of size and shape, zeolites are often referred to as molecular sieves. There has been considerable interest in the synthesis of zeolite nanocrystals (or nanozeolites), because they can serve as a model system for fundamental understanding of zeolite nucleation and growth mechanisms, as seeds for secondary growth of zeolite films and membranes, as building blocks for construction of hierarchical porous nanostructures, and for preparation of mixed matrix membranes (MMMs). Presently, in the synthesis of zeolite crystals, it is well-known that the addition of organic additives or polymers has an effect on the zeolite nucleation and crystallization. Despite several synthetic strategies of using some polymers (e.g. polyacrylamide and methylcellulose) have been developed to grow zeolites, there has been no research on the synthesis with crosslinked chitosan hydrogels or uncrosslinked chitosan polymers, which is one primary goal of this thesis. Therefore, chitosan (crosslinked or uncrosslinked polymers) was introduced into zeolite crystallization process. The zeolite crystal sizes were significantly affected by formulation of silica-containing crosslinked hydrogels and alkaline solution, and by aging and heating conditions. Importantly, a novel method of using hydrogen peroxide solution was developed to remove crosslinked hydrogels after zeolite synthesis, which was considered as an effective way for removal of hydrogels. The resultant zeolite nanocrystals were readily redispersed in deionized water and some other solvents, and therefore they may be useful for some applications, e.g. in the fabrication of zeolite-polymer mixed matrix membranes (MMMs) and hierarchical porous zeolitic structures. In this thesis, the effect of uncrosslinked chitosan hydrogels on zeolite nucleation and crystallization was also studied. Cubic zeolite with a single crystalline shell and an amorphous core was prepared for the first time by in-situ crystallization of sodium aluminosilicate gel inside the chitosan polymer networks. The TEM characterization further revealed that this formation process of cube-like or rectangular core-shell structures involved particle aggregation and surface-to-core crystallization induced by chitosan networks. It is expected that this work would provide a new model system for understanding and studying complex zeolite nucleation and growth mechanisms. To date, the research into efficient separation of hydrogen has been driven by its potential as an essential component of future energy economies. Despite some materials emerging for this purpose, it is believed that there should be plenty of room to develop mixed matrix membranes (MMMs) with an addition of inorganic particles, such as zeolites, for hydrogen separation or purification. In order to reduce the phase separation between organic and inorganic phases, organic functionalization is suggested as an effective way, which has been applied in my study. Sodalite, whose framework consists of a six-membered ring aperture, was selected as inorganic fillers in MMMs. To functionalize sodalite nanocrystals, organic functional groups were successfully attached to sodalite nanocrystals by the newly developed method - the direct transformation of organic-functionalized silicalite nanocrystals. Organic-functionalized sodalite nanocrystals were incorporated into polyimide membranes to form sodalite MMMs for hydrogen separation. Characterization by SEM showed that zeolite can be well distributed with polyimide phase, as confirmed by the FTIR spectroscopy and XRD results. TG results revealed the temperatures for corresponding major mass loss increased with the increasing inorganic content of MMMs. This was attributed to the interaction between the amino moieties from inorganic nanoparticles and polymer matrix, which restricted the movement of the main chains. The gas permeation results exhibited the significantly improved hydrogen separation property.

Zeolites in Sustainable Chemistry

Author : Feng-Shou Xiao
Publisher : Springer
ISBN 13 : 366247395X
Total Pages : 490 pages
Book Rating : 4.6/5 (624 download)

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Book Synopsis Zeolites in Sustainable Chemistry by : Feng-Shou Xiao

Download or read book Zeolites in Sustainable Chemistry written by Feng-Shou Xiao and published by Springer. This book was released on 2015-09-28 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Zeolite Characterization and Catalysis

Author : Arthur W. Chester
Publisher : Springer Science & Business Media
ISBN 13 : 140209678X
Total Pages : 372 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis Zeolite Characterization and Catalysis by : Arthur W. Chester

Download or read book Zeolite Characterization and Catalysis written by Arthur W. Chester and published by Springer Science & Business Media. This book was released on 2009-10-03 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Chemistry of Silica and Zeolite-Based Materials

Author : Abderrazzak Douhal
Publisher : Elsevier
ISBN 13 : 0128178140
Total Pages : 464 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Chemistry of Silica and Zeolite-Based Materials by : Abderrazzak Douhal

Download or read book Chemistry of Silica and Zeolite-Based Materials written by Abderrazzak Douhal and published by Elsevier. This book was released on 2019-07-04 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemistry of Silica and Zeolite-Based Materials covers a wide range of topics related to silica-based materials from design and synthesis to applications in different fields of science and technology. Since silica is transparent and inert to the light, it is a very attractive host material for constructing artificial photosynthesis systems. As an earth-abundant oxide, silica is an ideal and basic material for application of various oxides, and the science and technology of silica-based materials are fundamentally important for understanding other oxide-based materials. The book examines nanosolvation and confined molecules in silica hosts, catalysis and photocatalysis, photonics, photosensors, photovoltaics, energy, environmental sciences, drug delivery, and health. Written by a highly experienced and internationally renowned team from around the world, Chemistry of Silica and Zeolite-Based Materials is ideal for chemists, materials scientists, chemical engineers, physicists, biologists, biomedical sciences, environmental scientists, toxicologists, and pharma scientists. --- "The enormous versatility of silica for building a large variety of materials with unique properties has been very well illustrated in this book.... The reader will be exposed to numerous potential applications of these materials – from photocatalytic, optical and electronic applications, to chemical reactivity in confined spaces and biological applications. This book is of clear interest not only to PhD students and postdocs, but also to researchers in this field seeking an understanding of the possible applications of meso and microporous silica-derived materials." - Professor Avelino Corma, Institute of Chemical Technology (ITQ-CSIC) and Polytechnical University of Valencia, Spain Discusses the most important advances in various fields using silica materials, including nanosolvation and confined molecules in silica hosts, catalysis and photocatalysis, and other topics Written by a global team of experts from a variety of science and technology disciplines Ideal resource for chemists, materials scientists, and chemical engineers working with oxide-based materials

Zeolites and Zeolite-like Materials

Author : Bert Sels
Publisher : Elsevier
ISBN 13 : 0444635149
Total Pages : 475 pages
Book Rating : 4.4/5 (446 download)

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Book Synopsis Zeolites and Zeolite-like Materials by : Bert Sels

Download or read book Zeolites and Zeolite-like Materials written by Bert Sels and published by Elsevier. This book was released on 2016-07-29 with total page 475 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zeolites and Zeolite-like Materials offers a comprehensive and up-to-date review of the important areas of zeolite synthesis, characterization, and applications. Its chapters are written in an educational, easy-to-understand format for a generation of young zeolite chemists, especially those who are just starting research on the topic and need a reference that not only reflects the current state of zeolite research, but also identifies gaps and opportunities. The book demonstrates various applications of zeolites in heterogeneous catalysis and biomass conversion and identifies the endless possibilities that exist for this class of materials, their structures, functions, and future applications. In addition, it demonstrates that zeolite-like materials should be regarded as a living body developing towards new modern applications, thereby responding to the needs of modern technology challenges, including biomass conversion, medicine, laser techniques, and nanomaterial design, etc. The book will be of interest not only to zeolite-focused researchers, but also to a broad scientific and non-scientific audience. Provides a comprehensive review of the literature pertaining to zeolites and zeolite-like materials since 2000 Covers the chemistry of novel zeolite-like materials such as Metal-Organic Frameworks (MOFs), Covalent Organic Frameworks (COFs), hierarchical zeolite materials, new mesoporous and composite zeolite-like micro/mesoporous materials Presents essential information of the new zeolite-like structures, with a balanced coverage of the most important areas of the zeolite research (synthesis, characterization, adsorption, catalysis, new applications of zeolites and zeolite-like materials) Contains chapters prepared by known specialists who are members of the International Zeolite Association

Zeolites and Catalysis

Author : Jiri Cejka
Publisher : John Wiley & Sons
ISBN 13 : 9783527630301
Total Pages : 918 pages
Book Rating : 4.6/5 (33 download)

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Book Synopsis Zeolites and Catalysis by : Jiri Cejka

Download or read book Zeolites and Catalysis written by Jiri Cejka and published by John Wiley & Sons. This book was released on 2010-05-27 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt: This indispensable two-volume handbook covers everything on this hot research field. The first part deals with the synthesis, modification, characterization and application of catalytic active zeolites, while the second focuses on such reaction types as cracking, hydrocracking, isomerization, reforming and other industrially important topics. Edited by a highly experienced and internationally renowned team with chapters written by the "Who's Who" of zeolite research.

Zeolite Microporous Solids: Synthesis, Structure, and Reactivity

Author : E.G. Derouane
Publisher : Springer Science & Business Media
ISBN 13 : 9401126046
Total Pages : 635 pages
Book Rating : 4.4/5 (11 download)

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Book Synopsis Zeolite Microporous Solids: Synthesis, Structure, and Reactivity by : E.G. Derouane

Download or read book Zeolite Microporous Solids: Synthesis, Structure, and Reactivity written by E.G. Derouane and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 635 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intensive research on zeolites, during the past thirty years, has resulted in a deep understanding of their chemistry and in a true zeolite science, including synthesis, structure, chemical and physical properties, and catalysis. These studies are the basis for the development and growth of several industrial processes applying zeolites for selective sorption, separation, and catalysis. In 1983, a NATO Advanced Study Institute was organized in Alcabideche (portugal) to establish the State-of-the-Art in Zeolite Science and Technology and to contribute to a better understanding of the structural properties of zeolites, the configurational constraints they may exert, and their effects in adsorption, diffusion, and catalysis. Since then, zeolite science has witnessed an almost exponential growth in published papers and patents, dealing with both fundamentals issues and original applications. The proposal of new procedures for zeolite synthesis, the development of novel and sophisticated physical techniques for zeolite characterization, the discovery of new zeolitic and related microporous materials, progresses in quantum chemistry and molecular modeling of zeolites, and the application of zeolites as catalysts for organic reactions have prompted increasing interest among the scientific community. An important and harmonious interaction between various domains of Physics, Chemistry, and Engineering resulted therefrom.

Zeolite Synthesis

Author : Mario L. Occelli
Publisher :
ISBN 13 :
Total Pages : 672 pages
Book Rating : 4.:/5 (44 download)

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Book Synopsis Zeolite Synthesis by : Mario L. Occelli

Download or read book Zeolite Synthesis written by Mario L. Occelli and published by . This book was released on 1989 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is a complete progress report on the various aspects of zeolite synthesis on a molecular level. It provides many examples that illustrate how zeolites can be crystallized and what the important parameters are that control crystallization. Forty-two chapters cover such topics as: crystallization techniques; gel chemistry; crystal size and morphology; the role of organic compounds; and novel synthesis procedures. It offers a complete review of zeolite synthesis as well as the latest finding in this important field. Contains benchmark contributions from many notable pioneers in the field, including R.M. Barrer, H. Robson, and Robert Milton.

Insights into the Chemistry of Organic Structure-Directing Agents in the Synthesis of Zeolitic Materials

Author : Luis Gómez-Hortigüela
Publisher : Springer
ISBN 13 : 3319742892
Total Pages : 255 pages
Book Rating : 4.3/5 (197 download)

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Book Synopsis Insights into the Chemistry of Organic Structure-Directing Agents in the Synthesis of Zeolitic Materials by : Luis Gómez-Hortigüela

Download or read book Insights into the Chemistry of Organic Structure-Directing Agents in the Synthesis of Zeolitic Materials written by Luis Gómez-Hortigüela and published by Springer. This book was released on 2018-03-31 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited volume focuses on the host-guest chemistry of organic molecules and inorganic systems during synthesis (structure-direction). Organic molecules have been used for many years in the synthesis of zeolitic nanoporous frameworks. The addition of these organic molecules to the zeolite synthesis mixtures provokes a particular ordering of the inorganic units around them that directs the crystallization pathway towards a particular framework type; hence they are called structure-directing agents. Their use has allowed the discovery of an extremely large number of new zeolite frameworks and compositions. This volume covers the main aspects of the use of organic molecules as structure-directing agents for the synthesis of zeolites, including first an introduction of the main concepts, then two chapters covering state-of-the-art techniques currently used to understand the structure-directing phenomenon (location of molecules by XRD and molecular modeling techniques). The most recent trends in the types of organic molecules used as structure-directing agents are also presented, including the use of metal-complexes, the use of non-ammonium-based molecules (mainly phosphorus-based compounds) and the role of supramolecular chemistry in designing new large organic structure-directing agents produced by self-aggregation. In addition the volume explores the latest research attempting to transfer the asymmetric nature of organic chiral molecules used as structure-directing agents to the zeolite lattice to produce chiral enantioselective frameworks, one of the biggest challenges today in materials chemistry. This volume has interdisciplinary appeal and will engage scholars from the zeolite community with a general interest in microporous materials, which involves not only zeolite scientists, but also researchers working on metal-organic framework materials. The concepts covered will also be of interest for researchers working on the application of materials after encapsulation of molecules of interest in post-synthetic treatments. Further the work explores the main aspects of host-guest chemistry in hybrid organo-inorganic templated materials, which covers all types of materials where organic molecules are used as templates and are confined within framework-structured inorganic materials (intercalation compounds). Therefore the volume is also relevant to the wider materials chemistry community.

Photofunctional Zeolites

Author : Masakazu Anpo
Publisher : Nova Publishers
ISBN 13 : 9781560728016
Total Pages : 252 pages
Book Rating : 4.7/5 (28 download)

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Book Synopsis Photofunctional Zeolites by : Masakazu Anpo

Download or read book Photofunctional Zeolites written by Masakazu Anpo and published by Nova Publishers. This book was released on 2000 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Synthesis of Zeolite Nanocrystals and Their Application for Mixed Matrix Membranes

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (696 download)

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Book Synopsis Synthesis of Zeolite Nanocrystals and Their Application for Mixed Matrix Membranes by :

Download or read book Synthesis of Zeolite Nanocrystals and Their Application for Mixed Matrix Membranes written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Zeolites are a class of microporous solids with well-defined crystalline structures. Due to their ability to distinguish molecules on the basis of size and shape, zeolites are often referred to as molecular sieves. There has been considerable interest in the synthesis of zeolite nanocrystals (or nanozeolites), because they can serve as a model system for fundamental understanding of zeolite nucleation and growth mechanisms, as seeds for secondary growth of zeolite films and membranes, as building blocks for construction of hierarchical porous nanostructures, and for preparation of mixed matrix membranes (MMMs). Presently, in the synthesis of zeolite crystals, it is well-known that the addition of organic additives or polymers has an effect on the zeolite nucleation and crystallization. Despite several synthetic strategies of using some polymers (e.g. polyacrylamide and methylcellulose) have been developed to grow zeolites, there has been no research on the synthesis with crosslinked chitosan hydrogels or uncrosslinked chitosan polymers, which is one primary goal of this thesis. Therefore, chitosan (crosslinked or uncrosslinked polymers) was introduced into zeolite crystallization process. The zeolite crystal sizes were significantly affected by formulation of silica-containing crosslinked hydrogels and alkaline solution, and by aging and heating conditions. Importantly, a novel method of using hydrogen peroxide solution was developed to remove crosslinked hydrogels after zeolite synthesis, which was considered as an effective way for removal of hydrogels. The resultant zeolite nanocrystals were readily redispersed in deionized water and some other solvents, and therefore they may be useful for some applications, e.g. in the fabrication of zeolite-polymer mixed matrix membranes (MMMs) and hierarchical porous zeolitic structures. In this thesis, the effect of uncrosslinked chitosan hydrogels on zeolite nucleation and crystallization was also studied. Cubic zeolite wit.

Structure and Reactivity of Metals in Zeolite Materials

Author : Joaquín Pérez Pariente
Publisher : Springer
ISBN 13 : 3319989057
Total Pages : 316 pages
Book Rating : 4.3/5 (199 download)

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Book Synopsis Structure and Reactivity of Metals in Zeolite Materials by : Joaquín Pérez Pariente

Download or read book Structure and Reactivity of Metals in Zeolite Materials written by Joaquín Pérez Pariente and published by Springer. This book was released on 2018-09-12 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Introduction to Zeolite Science and Practice

Author : E.M. Flanigen
Publisher : Elsevier
ISBN 13 : 0080887112
Total Pages : 771 pages
Book Rating : 4.0/5 (88 download)

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Book Synopsis Introduction to Zeolite Science and Practice by : E.M. Flanigen

Download or read book Introduction to Zeolite Science and Practice written by E.M. Flanigen and published by Elsevier. This book was released on 1991-02-05 with total page 771 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zeolites and related molecular sieves have quickly become important pathways to new opportunities in the fields of oil processing and petrochemical synthesis. The signs of intense activity in both industry and academia are evident: burgeoning papers and patent applications; increasing numbers of industrial zeolite-based processes and their rapid expansion into organic chemicals manufacturing; recent progress in zeolite accessibility range, matrix behaviour, lattice components and satellite structures; and the recognition that zeolites, which are stable and can be regenerated, may be incorporated into new, environmentally friendly processes. This volume offers a thorough, up-to-date introduction to zeolites and such related materials as crystalline aluminium phosphates and clays. Its 16 chapters, each written by specialists, provide detailed treatments of zeolite theory (including a review of major developments), zeolite laboratory and research practice, and zeolite industry applications. Students and individuals entering the field will find Introduction to Zeolite Science and Practice a thorough guidebook. Experienced researchers will appreciate its in-depth coverage of the zeolite spectrum, including the latest views on zeolite structure, characterization and applications.