Synthesis and Characterization of Zirconia Coated Silica Nanoparticles for Catalytic Reactions PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Synthesis and Characterization of Zirconia Coated Silica Nanoparticles for Catalytic Reactions PDF full book. Access full book title Synthesis and Characterization of Zirconia Coated Silica Nanoparticles for Catalytic Reactions by . Download full books in PDF and EPUB format.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Silica nanoparticles and zirconia coated silica nanoparticles were prepared by Stober method.and various subsequent methods. The nanoparticles obtained were characterized by XRD, SEM, EDAX and IR analytical techniques. The XRD study of pure ZrO2 shows well crystalline characteristics with the presence of 100% monoclinic phase. The coated nanoparticles are found to be amorphous in nature. SEM study indicate the particles to possess disorder morphology with the particle are attached to each other through grain boundary to form agglomerated structure. The zirconia coated silica nanoparticles were used as a efficient catalyst for the synthesis of Bis(indolyl) methane under solvent free condition. The Bis(indolyl) methane were obtained with high yield and purity.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Silica nanoparticles and zirconia coated silica nanoparticles were prepared by Stober method.and various subsequent methods. The nanoparticles obtained were characterized by XRD, SEM, EDAX and IR analytical techniques. The XRD study of pure ZrO2 shows well crystalline characteristics with the presence of 100% monoclinic phase. The coated nanoparticles are found to be amorphous in nature. SEM study indicate the particles to possess disorder morphology with the particle are attached to each other through grain boundary to form agglomerated structure. The zirconia coated silica nanoparticles were used as a efficient catalyst for the synthesis of Bis(indolyl) methane under solvent free condition. The Bis(indolyl) methane were obtained with high yield and purity.
Author: Daniel J. Rosenberg
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages :
Get Book Here
Book Description
Author: Ali Abdali
Publisher:
ISBN: 9783954047048
Category :
Languages : en
Pages : 122
Get Book Here
Book Description
Author: R. Maggi
Publisher: Elsevier
ISBN: 0080539459
Category : Technology & Engineering
Languages : en
Pages : 1007
Get Book Here
Book Description
The proceedings of the VIIth International Symposium on the Scientific Bases for the Preparation of Heterogeneous Catalysts, are in line with the general scope of this series of events. Emphasis in all Symposia has been on the scientific aspects of the preparation of new and industrial catalysts, or on new methods of preparation, rather than on the catalytic reactions in which such solids are ultimately used. In the present context, the catalytic event itself has only been considered as another, though often decisive, method of catalyst characterization.
Author: Peng Wu
Publisher: John Wiley & Sons
ISBN: 3527839372
Category : Technology & Engineering
Languages : en
Pages : 501
Get Book Here
Book Description
Micro-Mesoporous Metallosilicates Up-to-date and in-depth text bridging the technology gap between fundamental research and industry-scale applications of porous materials for catalysis Micro-Mesoporous Metallosilicates: Synthesis, Characterization, and Catalytic Applications comprehensively introduces the chemistry and catalytic technologies of metallosilicates, an important family of microporous crystalline zeolite and heteroatom-containing mesoporous materials, with a primary focus on design synthesis, characterization, theoretical studies, and catalytic applications of titanosilicates, tin-silicates, germanosilicates and Ti-mesosilica, and more. The text covers recent advances in the synthesis of titanosilicates, including hydrothermal synthesis, dry-gel conversion, fluoride-assisted synthesis, and post-synthesis methods, along with the synthesis of metallosilicates with two-dimensional lamellar structures and their structural modifications as well as applications in selective oxidation reactions. The text also discusses synthesis of germanosilicates with specially designed organic structure-directing agents, synthesis and catalytic applications of heteroatom-containing mesoporous silica, and dendritic mesoporous silica nanoparticles with unique wrinkled center-radial structures. Overall, every important porous metallosilicate and its synthesis, characterization, pore engineering, catalytic application, and industrial technique and process are covered. Specific sample topics discussed in Micro-Mesoporous Metallosilicates include: Chemical post-modifications of titanosilicates, in terms of the effects on transfer, adsorption/desorption, and surface reactions X-Ray based techniques, ultraviolet-visible-near infrared spectroscopy, Raman spectroscopy, and solid-state NMR spectroscopy Theoretical calculation as an effective tool and supplement to understand the catalytic active center, structural character, and Brønsted/Lewis acidity Titanosilicates in the liquid-phase epoxidation reaction of propylene and propylene chloride to corresponding epoxides Effects of particle sizes, oxidation state, and location sites of Au nanoparticles, and epoxidation performance of Ti-containing materials Delivering cutting-edge research and bridging the technology gap between fundamental research and industrial applications, Micro-Mesoporous Metallosilicates is a valuable resource for chemists, materials scientists, chemical engineers, and experienced researchers in related fields.
Author: Sachin Namdeo Kothawade
Publisher:
ISBN: 9783111338446
Category : Medical
Languages : en
Pages : 0
Get Book Here
Book Description
Mesoporous silica comprehensively covers the importance and applications of mesoporous silica nanoparticles in the field of nanoscience and nanotechnology. The book delves into the synthesis and characterization of mesoporous silica nanoparticles, discussing various synthesis methods and characterization techniques employed in their production. It explores the properties and structure of mesoporous silica nanoparticles, including their porosity, surface area, structural features, and tunability. It discusses mechanical, thermal, and optical properties. The applications of mesoporous silica nanoparticles in drug delivery are covered in detail, focusing on controlled release systems, targeted drug delivery, and theranostic applications.The catalytic applications of mesoporous silica nanoparticles are examined, including the use of these nanoparticles as supported catalysts in catalytic reactions, with discussions on reaction mechanisms. The book also explores the sensing and biosensing applications of mesoporous silica nanoparticles, including optical and electrochemical sensing, bioanalytical applications, and detection of biomolecules and environmental pollutants. Surface functionalization techniques for mesoporous silica nanoparticles are discussed, highlighting the importance of tailoring their properties for specific applications. Biocompatibility and toxicity considerations are addressed, providing insights into the assessment of biocompatibility, toxicity evaluation, mitigation strategies, and regulatory considerations. The future directions and emerging trends in mesoporous silica nanoparticle research are explored, along with interdisciplinary approaches, challenges, and opportunities in the field. The book concludes by summarizing the key findings and discussing the overall significance of mesoporous silica nanoparticles in nanoscience and nanotechnology. The references section provides a comprehensive list of sources used throughout the book for further exploration. The book serves as an essential resource for researchers, professionals, and students interested in understanding the synthesis, characterization, properties, and diverse applications of mesoporous silica nanoparticles in the realm of nanoscience and nanotechnology.
Author: Meghshyam Keshvarao Patil
Publisher: LAP Lambert Academic Publishing
ISBN: 9783848430178
Category :
Languages : de
Pages : 188
Get Book Here
Book Description
Solid acids and superacids are the topics of everlasting interest due to numerous applications in many areas of the chemical industry. The present understanding of acid induced or catalyzed reactions cover an extremely broad field, ranging from large-scale industrial processes in hydrocarbon chemistry to enzyme-controlled reactions in the living cell. Among solid acid catalysts, the sulfated zirconia (SZ) has been received lot of interest which was first prepared and explored as a hydrocarbon isomerization catalyst in 1962. This book which is based on a comprehensive research study gives a detail information regarding synthesis of zirconia based solid acid catalysts, their characterization and applications particularly in organic synthesis and transformation reactions; and Cu(I)-Zeolite as a green catalyst for synthesis of propargylamines. This book is essential for researcher working in the field of catalysis.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
\Alpha$-Fe_2O_3$ nanoparticles and Silica Coated $Fe_2O_3$ Particles were synthesized by hydrothermal method and acid - base hydrolysis of TEOS respectively. The Core Shell Particles has been characterized by SEM, XRD, and Particle size analysis. From particle size analysis, it was seen that, the distribution maxima of $Fe_2O_3$ and $Fe_2O_3@SiO_2$ coated nanoparticle were of 120 & 350 nm, 150nm & 550 nm respectively. From XRD analysis, it was confirmed that silica sample nanoparticles is amorphous in nature. The SEM/EDX analysis data represents the presence of $Fe_2O_3@SiO_2$ and show only the compositions of $Si, O & Fe2O_3$ peaks. As $Fe_2O_3$ nanoparticles show applications in many fields including high density magnetic storage devices, ferrofluids, magnetic refrigeration systems, and catalysis. Aggregation of nanoparticles can be prevented by coating the particles with other materials. The core/shell structure enhances the thermal and chemical stability of the nanoparticles, improves solubility, makes them less cytotoxic and allows conjugation of other molecules to these particles.
Author: Rakesh Kumar Sharma
Publisher: Wspc (Europe)
ISBN: 9781786347466
Category : Science
Languages : en
Pages : 0
Get Book Here
Book Description
Currently the field of nanocatalysis is undergoing many exciting developments and the design of silica-based organic-inorganic hybrid nanocatalysts is a key focus of the researchers working in this field. This book aims to present a succinct overview of the recent research progress directed towards the fabrication of silica-based organic-inorganic hybrid catalytic systems encompassing the key advantages of silica nanoparticles and silica-coated magnetic nanoparticles in an integrated manner. Featuring comprehensive descriptions of almost all approaches utilized for the synthesis of nanomaterials including some latest techniques such as flow and microwave-assisted synthesis that enable large-scale synthesis, it proves useful not only to academics but also industrialists. It also includes a systematic discussion on the vital characterization techniques employed for authenticating the structure of these. The title also offers an enormous amount of knowledge about the fusion of nanotechnology with green chemistry that strives to meet the scientific challenges of protecting human health and the environment.
Author: Yue Zhang
Publisher: Open Dissertation Press
ISBN: 9781361310236
Category :
Languages : en
Pages :
Get Book Here
Book Description
This dissertation, "Synthesis and Characterization of Zirconia Based Solid Acid Catalysts for Biodiesel Production" by Yue, Zhang, 张悦, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Biodiesel is a promising renewable alternative fuel to fossil energy. For the biodiesel production from low-cost feedstock, a pretreatment step is essential, which is the esterification of free fatty acids (e.g. oleic acid) in the feedstock in order to avoid soap formation and minimize catalyst deactivation. Sulfuric acid modified zirconia (H2SO4-ZrO2) is known as an effective heterogeneous catalyst for esterification. However, due to rapid 〖SO〗_4 DEGREES(2-) leaching, its reusability is low and its practical use is thus largely hindered. Zirconia supported on silica (ZrO2-SiO2) serves as a kind of non-sulfated zirconia catalyst against the leaching of the active species. Moreover, the silica support offers a large surface area and excellent thermal stability, which can accommodate a number of active zirconia species. Furthermore, there are Zr-O-Si bondings at the contact area between ZrO2 and SiO2, which might result in the formation of a new strong acid species and induce an increase of the zirconia acidity accordingly. Herein, two types of ZrO2-SiO2 catalysts were prepared, by using the reverse microemulsion method and sol-gel-hydrothermal method, denoted as ZrO2-SiO2-ME and ZrO2-SiO2-SG, respectively. The as synthesized ZrO2-SiO2 were characterized by TEM, SEM, EDX, XRD, BET and IR. ZrO2-SiO2-ME demonstrated a good dispersion of ZrO2 nanoparticles, encapsulating in the monodispersed SiO2 host matrix, while ZrO2-SiO2-SG possessed the SiO2 support with a mesoporous structure, with an average pore size of 7 nm and a surface area of 418 m2/g. The catalysts both exhibited excellent catalytic activity and stable performance in the esterification of oleic acid. Besides non-sulfated zirconia, sulfated zirconia catalysts other than traditional H2SO4-ZrO2 were also developed as solid acid catalysts for biodiesel production. Two sulfur-containing strong acids, chlorosulfonic acid (HClSO3) and (NH4)2SO4, were employed to acidify ZrO2, and two sulfated zirconia catalysts were prepared accordingly, namely HClSO3-ZrO2 and S-ZrO2. They were characterized by SEM, EDX, XRD, BET, IR, TGA and NH3-TPD. Comparing with H2SO4-ZrO2, HClSO3-ZrO2 and S-ZrO2 contained higher sulfur content and more acid sites. More importantly, both HClSO3-ZrO2 and S-ZrO2 demonstrated high catalytic activity and excellent durability in the esterification of oleic acid. It is known that consecutive esterification and transesterification reactions are suitable for direct biodiesel production and acetylation of glycerol enables the conversion of this biodiesel byproduct to a biofuel additive. Therefore, all the above mentioned catalysts were examined to compare their catalytic abilities in these reactions. Among the four catalysts, HClSO3-ZrO2 exhibited the highest catalytic activity in both reactions under optimal conditions. The thesis work here described the preparation and characterization of four types of ZrO2-based solid acid catalysts. Their catalytic activities were thoroughly investigated upon the several essential steps in biodiesel production. In addition, the synthesis condition-activity relation was studied and the synthesis and reaction conditions were delicately tuned. DOI: 10.5353/th_b4985882 Subjects: Catalysts - Synthesis Zirconium oxide Biodiesel fuels
