Selective Catalysis Utilizing Bifunctionalized Mcm 41 Mesoporous Materials

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Selective Catalysis Utilizing Bifunctionalized MCM-41 Mesoporous Materials

Author :
Publisher :
ISBN 13 :
Total Pages : 43 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Selective Catalysis Utilizing Bifunctionalized MCM-41 Mesoporous Materials by :

Download or read book Selective Catalysis Utilizing Bifunctionalized MCM-41 Mesoporous Materials written by and published by . This book was released on 2005 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selective catalysis is a field that has been under intense investigation for the last 100 years. The most widely used method involves catalysts with stereochemical selectivity. In this type of catalysis, the catalyst controls which reactants will be transformed into the desired product. The secret to employing this type of catalysis, though, is to design the proper catalyst, which can be difficult. One may spend as much time developing the catalyst as spent separating the various products achieved. Another method of selective catalysis is now being explored. The method involves utilizing a multifunctional mesoporous silica catalyst with a gate-keeping capability. Properly functionalized mesoporous materials with well-defined pore morphology and surface properties can provide an ideal three-dimensional environment for anchoring various homogeneous catalysts. These materials can circumvent the multi-sited two-dimensional nature most heterogeneous systems have without adversely impacting the reactant diffusivity. These single-site nanostructured catalysts with ordered geometrical structure are advantageous in achieving high selectivity and reactivity. Mesoporous materials can be prepared to include pores lined homogeneously with tethered catalysts via co-condensation. Additionally, these materials can be reacted with another (RO)3SiZ̃ group by using the traditional grafting method; this group is anchored predominantly at the entrances to the pores rather than inside the pores. Thus, if these Z̃ groups are chosen properly, they can select certain molecules to enter the pores and be converted to products (Scheme 1). In such multifunctional catalysts, the selectivity depends on the discrimination of the gatekeeper. Gate-keeping MCM-41 materials are at the forefront of catalytic substances.

Selective Catalysis Utilizing Bifunctionalized MCM-41 Mesoporous Materials

Author : Kasey Jean Strosahl
Publisher :
ISBN 13 :
Total Pages : 78 pages
Book Rating : 4.:/5 (631 download)

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Book Synopsis Selective Catalysis Utilizing Bifunctionalized MCM-41 Mesoporous Materials by : Kasey Jean Strosahl

Download or read book Selective Catalysis Utilizing Bifunctionalized MCM-41 Mesoporous Materials written by Kasey Jean Strosahl and published by . This book was released on 2005 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: The unique properties of bifunctionalized MCM-41 prove it to be a valuable tool in the catalytic field. The primary functional group (i.e. acid/base, metal center) enables the reaction to proceed as the typical homogeneous reaction would; however, the secondary group places restrictions upon the catalytic reaction. The secondary group acts as a gatekeeper, only allowing the appropriate reactants to diffuse into the material's mesopores. In this work, hydrophobic pentafluorophenyl groups are co-condensed as secondary groups onto the inner surface of the pores. These secondary groups increase the hydrophobicity of the mesopores. By utilizing an aqueous solvent, then, one can control which reactants diffuse into the pores to interact with the catalyst. Herein, a Sharpless-type reaction between an organic azide and a terminal acetylene is effectively catalyzed using a copper/pentafluorophenyl MCM-41 material. The reaction's success depends upon the solvent employed-water versus benzene; therefore, the reaction is an example of how one can manipulate a catalytic reaction's yield by varying the reactant/solvent properties. Another reaction scheme is described where a molecule containing both hydrophobic and hydrophilic tails can be forced into a certain conformation by the hydrophobic MCM -41 in an aqueous solution to produce a syn elimination to a cis olefin. This method allows one to control the regiochemistry of the catalytic reaction. Numerous other types of reactions, including stereospecific reactions, could also be catalyzed using this same idea if modified to correspond with the appropriate characteristics.

Nanoporous Materials III

Author : M. Jaroniec
Publisher : Elsevier
ISBN 13 : 0080537227
Total Pages : 711 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Nanoporous Materials III by : M. Jaroniec

Download or read book Nanoporous Materials III written by M. Jaroniec and published by Elsevier. This book was released on 2002-05-15 with total page 711 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoporous Materials III contains the invited lectures and peer-reviewed oral and poster contributions to be presented at the 3rd Conference on Nanoporous Materials, which will be hosted in Ottawa, Canada, June 2002. The work covers complementary approaches to and recent advances in the field of nanostructured materials with pore sizes larger than 1nm, such as periodic mesoporous molecular sieves M41S and FSM16 and related materials including clays, carbon molecular sieves, colloidal crystal templated organic and inorganic materials, porous polymers and sol gels. The broad range of topics covered in relation to the synthesis and characterization of ordered mesoporous materials are of great importance for advanced adsorption, catalytic and separation processes as well as the development of nanotechnology. The contents of this title are based on topics to be discussed by invited lecturers, which deal with periodic mesoporous organosilicas, stability and catalytic activity of aluminosilicate mesostructures, electron microscopy studies of ordered materials, imprinted polymers and highly porous metal-organic frameworks. The other contributions deal with tailoring the surface and structural properties of nanoporous materials, giving a detailed characterization as well as demonstrating their usefulness for advanced adsorption and catalytic applications.

Clonal Propagation of Strap-leafed Vanda by Shoot-tip Culture

Author : Christopher Kheng Hoe Teo
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (163 download)

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Book Synopsis Clonal Propagation of Strap-leafed Vanda by Shoot-tip Culture by : Christopher Kheng Hoe Teo

Download or read book Clonal Propagation of Strap-leafed Vanda by Shoot-tip Culture written by Christopher Kheng Hoe Teo and published by . This book was released on 1973 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Morphological Control of Multifunctionalized Mesoporous Silica Nanomaterials for Catalysis Applications

Author : Seong Huh
Publisher :
ISBN 13 :
Total Pages : 256 pages
Book Rating : 4.:/5 (71 download)

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Book Synopsis Morphological Control of Multifunctionalized Mesoporous Silica Nanomaterials for Catalysis Applications by : Seong Huh

Download or read book Morphological Control of Multifunctionalized Mesoporous Silica Nanomaterials for Catalysis Applications written by Seong Huh and published by . This book was released on 2004 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: I found an efficient method to control the morphology of the organically monofunctionalized mesoporous silica materials by introducing different types of organoalkoxysilanes in a base-catalyzed co-condensation reaction. The monofunctionalized materials exhibit different particle morphologies relative to the pure MCM-41 material. The concentration dependence of the morphology is a critical factor to determine the final particle shape. A proposed mechanism of the shape evolution is also offered. After understanding the role of organoalkoxysilanes in producing various well-shaped nanomaterials, I also obtained a series of bifunctional mesoporous silica materials with certain particle morphology. A series of bifunctional mesoporous silica nanospheres (MSNs) whose physicochemical properties was investigated via solid state NMR techniques and Cu2 adsorption capacity tests. The ratio of two different organic groups inside of mesopores of these MSNs could be fine-tuned. These MSNs serve as a useful model system to study substrate selectivity in catalytic reactions and sorption phenomena. For example, the Cu2+ adsorption capacity of these materials was dictated by the chemical nature of the mesopores generated by the different organic functional groups. An investigation of the substrate selectivity of the bifunctionalized MSNs in a competitive nitroaldol reaction using an equimolar amount of two competing 4-nitrobenzaldehyde derivatives was performed. Shape-controlled bifunctional MSNs were employed as the catalysts. The properties of the MSNs were investigated using various spectroscopic methods and electron microscopy. The more hydrophobic the surface organic groups are, the higher the ratio of hydrophobic final product. This is the first example to demonstrate the selection of substrate using physicochemical nature of the mesopore surface other than the conventional shape selection in zeolite systems. I also created a cooperative dual catalyst system that is capable of activating two different substrates in aldol reaction, Henry reaction and cyanosilylation. One catalytic group activates the nucleophile, another organic group simultaneously activates the electrophile to enhance the total reaction rate. I systematically varied the amount of two organic groups and performed the three model reactions to compare rate enhancements.

Morphological Control of Multifunctional Mesoporous Silica Nanomaterials for Catalysis Applications

Author :
Publisher :
ISBN 13 :
Total Pages : 135 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Morphological Control of Multifunctional Mesoporous Silica Nanomaterials for Catalysis Applications by :

Download or read book Morphological Control of Multifunctional Mesoporous Silica Nanomaterials for Catalysis Applications written by and published by . This book was released on 2004 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: I found an efficient method to control the morphology of the organically monofunctionalized mesoporous silica materials by introducing different types of organoalkoxysilanes in a base-catalyzed co-condensation reaction. The monofunctionalized materials exhibit different particle morphologies relative to the pure MCM-41 material. The concentration dependence of the morphology is a critical factor to determine the final particle shape. A proposed mechanism of the shape evolution is also offered. After understanding the role of organoalkoxysilanes in producing various well-shaped nanomaterials, I also obtained a series of bifunctional mesoporous silica materials with certain particle morphology. A series of bifunctional mesoporous silica nanospheres (MSNs) whose physicochemical properties was investigated via solid state NMR techniques and Cu2+ adsorption capacity tests, The ratio of two different organic groups inside of mesopores of these MSNs could be fine-tuned. These MSNs serve as a useful model system to study substrate selectivity in catalytic reactions and sorption phenomena. For example, the Cu2+ adsorption capacity of these materials was dictated by the chemical nature of the mesopores generated by the different organic functional groups. An investigation of the substrate selectivity of the bifunctionalized MSNs in a competitive nitroaldol reaction using an equimolar amount of two competing 4-nitrobenzaldehyde derivatives was performed. Shape-controlled bifunctional MSNs were employed as the catalysts. The properties of the MSNs were investigated using various spectroscopic methods and electron microscopy. The more hydrophobic the surface organic groups are, the higher the ratio of hydrophobic final product. This is the first example to demonstrate the selection of substrate using physicochemical nature of the mesopore surface other than the conventional shape selection in zeolite systems. I also created a cooperative dual catalyst system that is capable of activating two different substrates in aldol reaction, Henry reaction and cyanosilylation. One catalytic group activates the nucleophile, another organic group simultaneously activates the electrophile to enhance the total reaction rate. I systematically vaned the amount of two organic groups and performed the three model reactions to compare rate enhancements.

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.

Synthesis, Modification, and Application of Mesoporous Materials Based on MCM-41

Author : Zeid Abdullah AL-Othman
Publisher :
ISBN 13 : 9781109853391
Total Pages : 469 pages
Book Rating : 4.8/5 (533 download)

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Book Synopsis Synthesis, Modification, and Application of Mesoporous Materials Based on MCM-41 by : Zeid Abdullah AL-Othman

Download or read book Synthesis, Modification, and Application of Mesoporous Materials Based on MCM-41 written by Zeid Abdullah AL-Othman and published by . This book was released on 2006 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: Findings and conclusions. The synthesized mesoporous materials possess high surface areas, large pore sizes, narrow pore size distributions, and high thermal, hydrothermal, and mechanical stabilities. The modified mesoporous materials were found to have high selectivity and capacity in the adsorption and separation of the transition and heavy metal ions in the aqueous solution. In addition, they showed great selectivity and capacity for the adsorption and separation of the radioactive materials in aqueous medium.

Mesoporous Molecular Sieves 1998

Author : L. Bonneviot
Publisher : Elsevier
ISBN 13 : 0080536247
Total Pages : 633 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Mesoporous Molecular Sieves 1998 by : L. Bonneviot

Download or read book Mesoporous Molecular Sieves 1998 written by L. Bonneviot and published by Elsevier. This book was released on 1998-07-08 with total page 633 pages. Available in PDF, EPUB and Kindle. Book excerpt: The original properties of mesoporous molecular sieves are so unique that the design of most existing catalysts could be reconsidered. It might indeed be of interest to introduce MMS either as a support or as the active phase, merely on the basis of their high surface areas, narrow pore size distribution and flexibility in composition. The recent literature provides examples of MMS based catalysts of many types such as acid-base solids, supported metals and supported oxides, mixed oxides, anchored complexes and clusters, grafted organic functional groups and others. Examples of all these developments are documented in the present proceedings including some spectacular new proposals. The new metallic (Pt) mesophases are specially worth mentioning because they represent a new approach to producing non-supported highly dispersed metals. In these proceedings the reader will find feature articles and regular papers from many worldwide groups, covering all aspects of synthesis, physical characterization and catalytic reactivity of MMS and their chemically modified forms. It is actually remarkable that this recent development brought together an even broader spectrum of scientists from traditionally unrelated fields such as those of liquid crystals, surfactants, sol-gels, amorphous oxides and mixed oxides, solid state, adsorbents and heterogeneous catalysts. Obviously, this is a fast-growing research area which triggers the imagination and creativity at the cross-road between material design, molecular surface tailoring and catalytic applications.

Nanocasting

Author : An-Hui Lu
Publisher : Royal Society of Chemistry
ISBN 13 : 0854041885
Total Pages : 279 pages
Book Rating : 4.8/5 (54 download)

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Book Synopsis Nanocasting by : An-Hui Lu

Download or read book Nanocasting written by An-Hui Lu and published by Royal Society of Chemistry. This book was released on 2010 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured materials with tailored properties are regarded as a fundamental element in the development of future science and technology. Research is still ongoing into the nanosized construction elements required to create functional solids. The recently developed technique, nanocasting, has great advantage over others in terms of the synthesis of special nanostructured materials by the careful choice of suitable elements and nanoengineering steps. This new book summarizes the recent developments in nanocasting, including the principles of nanocasting, syntheses of novel nanostructured materials, characterization methods, detailed synthetic recipes and further possible development in this area. The book focuses on the synthesis of porous solids from the viewpoint of methodology and introduces the science of nanocasting from fundamental principles to their use in synthesis of various materials. It starts by outlining the principles of nanocasting, requirements to the templates and precursors and the tools needed to probe matter at the nanoscale level. It describes how to synthesize nano structured porous solids with defined characteristics and finally discusses the functionalization and application of porous solids. Special attention is given to new developments in this field and future perspectives. A useful appendix covering the detailed synthetic recipes of various templates including porous silica, porous carbon and colloidal spheres is included which will be invaluable to researchers wanting to follow and reproduce nanocast materials. Topics covered in the book include: * inorganic chemistry * organic chemistry * solution chemistry * sol-gel and interface science * acid-base equilibria * electrochemistry * biochemistry * confined synthesis The book gives readers not only an overview of nanocasting technology, but also sufficient information and knowledge for those wanting to prepare various nanostructured materials without needing to search the available literature.

Mesoporous Crystals and Related Nano-Structured Materials

Author : Osamu Terasaki
Publisher : Elsevier
ISBN 13 : 0080536239
Total Pages : 307 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Mesoporous Crystals and Related Nano-Structured Materials by : Osamu Terasaki

Download or read book Mesoporous Crystals and Related Nano-Structured Materials written by Osamu Terasaki and published by Elsevier. This book was released on 2004-05-25 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mesoporous Crystals and Related Nano-Structures Materials contains the invited lectures to be presented at the symposium on Mesoporous Crystals and Related Nano-Structures Materials, Stockholm, Sweden, June 1-2, 2004. This book highlights the core research that has led to such a fruitful and exciting field. Passing on, first hand, the synthesis of this novel material makes this book an important reference material to researchers young and old. * This book highlights the core research that has led to the fruitful and exciting field of mesoporous materials* It provides an overview of the studies which have led to the discovery of mesoporous materials as well as first preparations of mesoporous materials by researchers across the world* This book not only serves as important reference material but also as a source of scientific inspiration to all researchers working in the field of mesoporous materials

Synthesis and Adsorptivity of Modified and Unmodified MCM-41 Mesoporous Materials

Author : Wararak Thachan
Publisher :
ISBN 13 : 9789749830123
Total Pages : 446 pages
Book Rating : 4.8/5 (31 download)

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Book Synopsis Synthesis and Adsorptivity of Modified and Unmodified MCM-41 Mesoporous Materials by : Wararak Thachan

Download or read book Synthesis and Adsorptivity of Modified and Unmodified MCM-41 Mesoporous Materials written by Wararak Thachan and published by . This book was released on 2005 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Production of Biofuels and Chemicals with Bifunctional Catalysts

Author : Zhen Fang
Publisher : Springer
ISBN 13 : 9811051372
Total Pages : 396 pages
Book Rating : 4.8/5 (11 download)

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Book Synopsis Production of Biofuels and Chemicals with Bifunctional Catalysts by : Zhen Fang

Download or read book Production of Biofuels and Chemicals with Bifunctional Catalysts written by Zhen Fang and published by Springer. This book was released on 2017-12-27 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides state-of-the-art reviews, current research, prospects and challenges of the production of biofuels and chemicals such as furanic biofuels, biodiesel, carboxylic acids, polyols and others from lignocellulosic biomass, furfurals, syngas and γ-valerolactone with bifunctional catalysts, including catalytic, and combined biological and chemical catalysis processes. The bifunctionality of catalytic materials is a concept of not only using multifunctional solid materials as activators, but also design of materials in such a way that the catalytic materials have synergistic characteristics that promote a cascade of transformations with performance beyond that of mixed mono-functional catalysts. This book is a reference designed for researchers, academicians and industrialists in the area of catalysis, energy, chemical engineering and biomass conversion. Readers will find the wealth of information contained in chapters both useful and essential, for assessing the production and application of various biofuels and chemicals by chemical catalysis and biological techniques.

Microporous and Mesoporous Solid Catalysts

Author : Eric G. Derouane
Publisher : John Wiley & Sons
ISBN 13 : 9780470094204
Total Pages : 258 pages
Book Rating : 4.0/5 (942 download)

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Book Synopsis Microporous and Mesoporous Solid Catalysts by : Eric G. Derouane

Download or read book Microporous and Mesoporous Solid Catalysts written by Eric G. Derouane and published by John Wiley & Sons. This book was released on 2006-08-14 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: This series offers practical help for advanced undergraduate, graduate and postgraduate students, as well as experienced chemists in industry and academia working with catalysts in organic and organometallic synthesis. It features tested and validated procedures, authoritative reviews on classes of catalysts, and assessments of all types of catalysts. Micro- and Mesoporous Solid Catalysts describes the use of zeolites and mesoporous solids as catalysts for the production of fine and specialty chemicals. Specific tips and hints are provided and some typical procedures are described in detail In addition to discussing the pros and cons, several major organic transformations are examined including aromatic substitutions, heterocyclic ring formation, amines synthesis, oligomerisation, oxidation and hydroxylation, and other regioselective and stereoselective reactions Features tutorial introductory chapters, including tips and hints for achieving successful organic transformations Important reactions are featured together with recommendations to resolve potential problems.

Master's Theses Directories

Author :
Publisher :
ISBN 13 :
Total Pages : 316 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Master's Theses Directories by :

Download or read book Master's Theses Directories written by and published by . This book was released on 2005 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Education, arts and social sciences, natural and technical sciences in the United States and Canada".

Nanoporous Materials: Science And Engineering

Author : G Q Max Lu
Publisher : World Scientific
ISBN 13 : 178326179X
Total Pages : 911 pages
Book Rating : 4.7/5 (832 download)

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Book Synopsis Nanoporous Materials: Science And Engineering by : G Q Max Lu

Download or read book Nanoporous Materials: Science And Engineering written by G Q Max Lu and published by World Scientific. This book was released on 2004-11-22 with total page 911 pages. Available in PDF, EPUB and Kindle. Book excerpt: Porous materials are of scientific and technological importance because of the presence of voids of controllable dimensions at the atomic, molecular, and nanometer scales, enabling them to discriminate and interact with molecules and clusters. Interestingly the big deal about this class of materials is about the “nothingness” within — the pore space. International Union of Pure and Applied Chemistry (IUPAC) classifies porous materials into three categories — micropores of less than 2 nm in diameter, mesopores between 2 and 50 nm, and macropores of greater than 50 nm. In this book, nanoporous materials are defined as those porous materials with pore diameters less than 100 nm.Over the last decade, there has been an ever increasing interest and research effort in the synthesis, characterization, functionalization, molecular modeling and design of nanoporous materials. The main challenges in research include the fundamental understanding of structure-property relations and tailor-design of nanostructures for specific properties and applications. Research efforts in this field have been driven by the rapid growing emerging applications such as biosensor, drug delivery, gas separation, energy storage and fuel cell technology, nanocatalysis and photonics. These applications offer exciting new opportunities for scientists to develop new strategies and techniques for the synthesis and applications of these materials.This book provides a series of systematic reviews of the recent developments in nanoporous materials. It covers the following topics: (1) synthesis, processing, characterization and property evaluation; (2) functionalization by physical and/or chemical treatments; (3) experimental and computational studies on fundamental properties, such as catalytic effects, transport and adsorption, molecular sieving and biosorption; (4) applications, including photonic devices, catalysis, environmental pollution control, biological molecules separation and isolation, sensors, membranes, hydrogen and energy storage, etc./a

Ordered Mesoporous Materials

Author : Dongyuan Zhao
Publisher : John Wiley & Sons
ISBN 13 : 3527647899
Total Pages : 544 pages
Book Rating : 4.5/5 (276 download)

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Book Synopsis Ordered Mesoporous Materials by : Dongyuan Zhao

Download or read book Ordered Mesoporous Materials written by Dongyuan Zhao and published by John Wiley & Sons. This book was released on 2012-11-28 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mesoporous materials are a class of molecules with a large and uniform pore size, highly regular nanopores, and a large surface area. This book is devoted to all aspects and types of these materials and describes, in an in-depth and systematic manner, the step-by-step synthesis and its mechanism, as well as the characterization, morphology control, hybridization, and applications, of mesoporous molecular sieves. In so doing, it covers silicates, metal-doped silicates, nonsilicates, and organic-inorganic hybrids. Although the emphasis is on synthesis, the expert authors also discuss characterization and applications, ranging from catalysis and biochemistry to optics and the use of these materials as templates for nanomaterial synthesis. Both the fundamentals and the latest research results are covered, ensuring that this monograph serves as a reference for researchers in and newcomers to the field.