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Synthesis Of Movtenb Oxide Catalysts For Propane Oxidation To Acrylic Acid Via Microwave Irradiation Assisted Slurry Method
Download Synthesis Of Movtenb Oxide Catalysts For Propane Oxidation To Acrylic Acid Via Microwave Irradiation Assisted Slurry Method full books in PDF, epub, and Kindle. Read online Synthesis Of Movtenb Oxide Catalysts For Propane Oxidation To Acrylic Acid Via Microwave Irradiation Assisted Slurry Method ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Synthesis of MoVTeNb Oxide Catalysts for Propane Oxidation to Acrylic Acid Via Microwave Irradiation-assisted Slurry Method by : Ahmad Afandi Muda
Download or read book Synthesis of MoVTeNb Oxide Catalysts for Propane Oxidation to Acrylic Acid Via Microwave Irradiation-assisted Slurry Method written by Ahmad Afandi Muda and published by . This book was released on 2014 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Catalyst Preparation and Surface Modification Synthesis and Nanostructuring of MoVTeNb Oxide Catalyst for Propane Oxidation to Acrylic Acid by : Fazliana Abd Hamid
Download or read book Effect of Catalyst Preparation and Surface Modification Synthesis and Nanostructuring of MoVTeNb Oxide Catalyst for Propane Oxidation to Acrylic Acid written by Fazliana Abd Hamid and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of M1 Phase Molybdenum Based Mixed Metal Oxide Catalysts for Selective Oxidation of Propane by : Xin Li
Download or read book Investigation of M1 Phase Molybdenum Based Mixed Metal Oxide Catalysts for Selective Oxidation of Propane written by Xin Li and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Acrylic acid and acrylonitrile are important intermediates for producing a number of common chemicals and materials used in paints, adhesives, plastics, fibers, etc. Traditionally, their production has relied on propylene feedstocks, and replacing propylene with the cheaper and more abundant propane as the raw material has attracted a lot of research interest during the past two decades. Several promising catalysts have been discovered, and to date, Mo-V-Nb-Te-O mixed metal oxides are the most efficient for both propane oxidation to acrylic acid and ammoxidation to acrylonitrile. Two orthorhombic phases named M1 and M2 have been identified as the major components, and M1 is generally considered the key factor for propane activation. In particular, the [001] face of the M1 structure has been proposed to provide active centers and the valence distribution on [001] face is believed to play an important role in determining the reaction mechanism. However, the detailed mechanism is not fully understood. This has limited opportunities to further improve catalysts performance or design better catalysts by rational means. This absence can be related to the past failure of generating M1 phase alone in synthesis, and many catalysts studied previously were actually mixtures. Thus, in this work, we carried out investigations of the highly pure M1 catalyst focusing on the synthesis, catalytic behavior, and structural model development. The hydrothermal method has been shown to yield M1 phase with high purity at the expense of a more complicated procedure. The simple slurry method was used by us to synthesize catalyst samples. It is found that, besides M1 and M2, tellurium molybdate TeMo 5 O 16, V-substituted Mo 5 O 14 or (V, Mo) 5 O 14, and Mosubstituted V 2 O 5 or (Mo, V) 2 O 5 are also often formed together. The final phase composition can be significantly affected by nominal metal composition, slurry pH, calcination heating rate, etc. And the relative amount of each phase under different conditions can be directly correlated with respective V/Mo and Te/Mo ratios. Further, an additional purification step where the sample mixture is washed by H 2 O 2 solution was studied, and it is observed that concentrated hydrogen peroxide offers the most effective removal of undesired phases. A complete procedure for obtaining M1 phase in high purity has been developed. Synthesized M1 catalysts were characterized by EDS and XPS, and results suggest that the M1 structure shows high chemical flexibility and can contain vanadium to quite different levels depending on the nominal metal stoichiometry in the slurry. In particular, it is seen that the more vanadium in the slurry, the more vanadium in the final M1 structure. Additionally, no significant difference between the surface and the bulk was observed with respect to metal composition.
Book Synopsis Synthesis & Characterization of Multimetallic Oxide Catalysts for Selective Oxidation of Propane to Acrylic Acid by : Rubia Idris
Download or read book Synthesis & Characterization of Multimetallic Oxide Catalysts for Selective Oxidation of Propane to Acrylic Acid written by Rubia Idris and published by . This book was released on 2004 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Throughput Preparation and Testing of SbMoVNb Mixed Oxide Catalysts for Selective Oxidation of Propane to Acrylic Acid by : Luqian Chen
Download or read book High Throughput Preparation and Testing of SbMoVNb Mixed Oxide Catalysts for Selective Oxidation of Propane to Acrylic Acid written by Luqian Chen and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Multi-metal Oxide Catalysts for Selective Oxidation of Propane to Acrylic Acid by : Rosliza Mohd Salim
Download or read book Synthesis and Characterization of Multi-metal Oxide Catalysts for Selective Oxidation of Propane to Acrylic Acid written by Rosliza Mohd Salim and published by . This book was released on 2007 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Peau de fleur written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Investigation of Phase Pure M1 MoVTeNbO X Catalysts for Selective Oxidation of Propane to Acrylic Acid by :
Download or read book Synthesis and Investigation of Phase Pure M1 MoVTeNbO X Catalysts for Selective Oxidation of Propane to Acrylic Acid written by and published by . This book was released on 2008 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalytic Studies of Propane Oxidation to Acrylic Acid on Mo-V-Sb-Nb Mixed Oxides Catalysts by : Ekaterina Krasteva Novakova
Download or read book Catalytic Studies of Propane Oxidation to Acrylic Acid on Mo-V-Sb-Nb Mixed Oxides Catalysts written by Ekaterina Krasteva Novakova and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mesoporous and Macroporous Mixed Metal Oxide MoVTeNbOx Catalysts for Propane (amm) Oxidation by :
Download or read book Mesoporous and Macroporous Mixed Metal Oxide MoVTeNbOx Catalysts for Propane (amm) Oxidation written by and published by . This book was released on 2008 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: Approximately 5 million metric tons of acrylonitrile are produced worldwide annually for the manufacture of acrylic fibers, copolymers and reinforced carbon fibers. There is currently intense commercial interest in developing a new catalytic process for acrylonitrile production via propane ammoxidation employing multicomponent mixed metal oxides, which would replace the existing propylene ammoxidation technology. This new technology is expected to lower the production cost by 30% as compared to the existing process because of the lower cost of propane and increased production of valuable co-products, such as acetonitrile. The key to the success of this important technology is the development of novel mixed metal oxide catalysts that can selectively ammoxidize propane to acrylonitrile. Recent developments in macroscale and mesoscale structure-directed self-assembly offer many attractive possibilities for the molecular design of novel catalytic mixed metal oxides. The present work describes the development of novel synthesis approaches for macroporous and mesoporous mixed metal MoVTe(Sb)NbOx catalysts displaying ordered porous structures, high surface areas, flexible compositions and improved thermal stability for propane ammoxidation. This research began with systematic exploration of synthesis of mesoporous Nb2O5 oxides as a departure point in the subsequent synthesis of mixed M-Nb-O (M=Mo, V, Te, Sb) oxides employing Nb2O5 as the major component or the catalytic support. Nb2O5 was chosen for this study as the most stable metal oxide possessing the highest Tammann temperature among all constituent metal oxides (MoOx, VOx, TeOx and SbOx). Thermally stable (up to 500 °C) and well-defined two-dimensional hexagonal mesostructured niobium oxides were obtained possessing the surface areas of up to 210 m2/g. The pore size of mesoporous niobium oxides was for the first time tuned in a wide range from 4.6 to 21 nm by varying synthesis conditions. As compared with previous studies, mesoporous niobium oxides with tunable pore sizes obtained in this work possessed more attractive pores structures which make them promising as catalytic supports or a major component in the synthesis of improved MoVTeNbOx catalysts for selective (amm)oxidation of propane. Thermally stable mesoporous binary (Nb-M-O, M=Mo, V, or Sb), multicomponent (MNbOx, M=Mo+V+Te) and supported (M/Nb, M=Mo+V+Te+Nb) mixed metal oxide catalysts were for the first time synthesized by evaporation-induced self-assembly and incipient-wetness impregnation techniques. These mixed metal oxide phases displayed good thermal stability of amorphous inorganic wall (up to 400°C), large pore sizes (5-23 nm), high surface areas (up to 232 m2/g) and flexible inorganic wall compositions. Improved dispersion of active components in the Nb2O5 matrix and over the Nb2O5 support was observed. However, the desirable M1 phase was not observed in the products of thermal transformation of these mesoporous mixed metal oxides probably due to insufficient thickness of inorganic walls in these phases. In order to investigate nucleation of the catalytic M1 phase and further improve the thermal stability of the ordered porous structure, MoVTeNbOx phases displaying both macroporous and mesoporous structures were prepared by a dual templating approach employing colloidal arrays of polystyrene spheres and non-ionic surfactants. The MoVTeNbOx phases possessing such dual porosity were obtained after polystyrene spheres and non-ionic surfactants were removed in a low temperature calcination step. These hierarchical MoVTeNbOx phases displaying bimodal pore structure transformed into macroporous rutile phase possessing nanocrystalline inorganic walls at high temperature. These MoVTeNbOx rutile phases possessed high surface areas (70 m2/g), desirable pore architectures, robust nanocrystalline inorganic walls and enhanced thermal stability (up to 600 °C). Although these macroporous MoVTeNbOx rutile catalysts displayed lower activity in propane ammoxidation and lower acrylonitrile selectivity in propane ammoxidation as compared to the active and selective M1 phase, the novel synthesis method reported in these studies represents a promising general approach to design novel complex mixed metal oxides for a wide range of applications in selective oxidation catalysis.
Book Synopsis Molecular Structure-reactivity Relationships for Propane Oxidation Over Model Mixed Oxide Catalysts by :
Download or read book Molecular Structure-reactivity Relationships for Propane Oxidation Over Model Mixed Oxide Catalysts written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mixed Mo-V-Sb-Nb and Mo-V-Te-Nb oxides were recently discovered as highly active and selective catalysts for the propane oxidation to propylene and oxygenates, i.e. acrolein and acrylic acid. Fundamental information is needed for understanding the bulk and surface molecular structure-activity/selectivity relationships and providing rules of rational design of improved mixed metal oxide catalysts for the selective oxidation of propane. The phase composition and catalytic activity of the model Mo-V-Sb-Nb-O system strongly depended on the synthesis route and composition. A number of distinct solid-state phases were observed in this system: Mo6V9O40, MoO3, rutile SbVO4 and the defect "Mo-V-Nb-O" phases. The kinetic studies indicated that the high selectivity to acrylic acid (2̃0 mol.%) was associated with the Mo6V9O40 and the defect "Mo-V-Nb-O" phases. The synthesis of these mixed Mo-V-Sb-Nb-O system was performed using combinatorial chemistry techniques to explore the utility of liquid phase automated synthesis for the reproducible preparation of these catalysts. This study indicated good reproducibility of phase compositions and catalytic properties and provided new insights into the transformation processes that occur in these oxides with time on stream. It was discovered in this research that the model mixed Mo-V-Te-O catalyst represents a simple model system for elucidating the molecular structure-activity/selectivity relationships in propane selective oxidation. This catalyst contains the two major crystalline phases proposed as active and selective for propane oxidation. This research elucidated the effect of the chemical composition, solution pH and thermal treatment on phase composition and catalytic performance. High resolution TEM study established the crystal structures of the hexagonal and orthorhombic phases in terms of their space groups, unit cell parameters, atomic coordinates and elemental compositions. In order to understand the role of the structure, morphology and composition of mixed Mo-V-Te-Nb-O system, novel synthesis approaches employing ordered arrays of colloidal polystyrene spheres (0.4 ưm) were successfully developed. These novel nanocrystalline catalysts with surface areas in the 80-110 m2/g range consisted of 20-50 nm particles of desirable catalytic phases and contained 6-20 nm pores. Kinetic studies demonstrated the acrylic acid yields exceeding 40 mol.% and approaching the commercial targets for the selective oxidation of propane to acrylic acid.
Book Synopsis Selective Oxidation of Propane to Acrylic Acid Over MoVTe(Sb)NbO X Catalysts by : Frederik Nikolaus Naraschewski
Download or read book Selective Oxidation of Propane to Acrylic Acid Over MoVTe(Sb)NbO X Catalysts written by Frederik Nikolaus Naraschewski and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selective Oxidation of Propane to Acrylic Acid Over Multi Metal Oxide Catalyst by : Restu Kartiko Widi
Download or read book Selective Oxidation of Propane to Acrylic Acid Over Multi Metal Oxide Catalyst written by Restu Kartiko Widi and published by . This book was released on 2004 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modification and Characterization of Vanadium Phosphorus Oxide Catalysts for Selective Oxidation of Propane to Acrylic Acid by : Chaing Shen Saw
Download or read book Modification and Characterization of Vanadium Phosphorus Oxide Catalysts for Selective Oxidation of Propane to Acrylic Acid written by Chaing Shen Saw and published by . This book was released on 2006 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Sachindra Sood Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780612220447 Total Pages :87 pages Book Rating :4.2/5 (24 download)
Book Synopsis One-step Oxidation of Propylene to Acrylic Acid [microform] by : Sachindra Sood
Download or read book One-step Oxidation of Propylene to Acrylic Acid [microform] written by Sachindra Sood and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1995 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Bulk Structure and Catalytic Properties of Mixed Mo-V-Sb-Nb Oxides for Selective Propane Oxidation to Acrylic Acid by : Jamal N. Al-Saeedi
Download or read book The Bulk Structure and Catalytic Properties of Mixed Mo-V-Sb-Nb Oxides for Selective Propane Oxidation to Acrylic Acid written by Jamal N. Al-Saeedi and published by . This book was released on 2001 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalystic Wet Oxidation of Wastewater Containing Acrylic Acid by : Weng Keong Lau
Download or read book Catalystic Wet Oxidation of Wastewater Containing Acrylic Acid written by Weng Keong Lau and published by . This book was released on 2013 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acrylic acid (AA) is one of the hazardous organic compounds that can be found in industrial wastewater which can cause serious damage to the environment and health. From this research, catalytic wet air oxidation (CWO) process has been used with the presence of Manganese-Cerium Oxide catalyst in order to oxidise acrylic acid in the less severe operating condition. In the present research, the Manganese-Cerium Oxide catalyst (Ce-Mn-1) was prepared by co-precipitation and characterized by using X- ray diffraction (XRD), X-ray flusoncen (XRF), Brunauer, Emmett, and Teller theory (BET) and Barrett, Joyner, and Halenda (BJH) analysis. In addition, performance of the catalyst in CWO of wastewater containing Acrylic Acid was obtained by manipulating different operating parameters, which are temperature, and the concentration of Acrylic Acid. The catalytic activity was analyzed by Chemical Oxygen Demand (COD) analysis method. The catalyst with manganese/cerium ratio 67/33 was successful synthesized with specific surface area, 83.1155 m2g-1 and pore volume 0.3031cm3g-1. Although the synthesized catalyst showed good physical characteristic but the literature COD reduction data obtained is fluctuating due to the side reaction polymerization and formation of carbonic acid during the experiments. As the conclusion the characteristics of catalyst shown a good result but due to the side reaction occur during the experiments, the catalytic activity can't be determined.
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