Download or read book Synthesis Characterization and Catalytic Activity of Palladium Supported on Bleaching Clay written by Amirul Edham Roslee and published by . This book was released on 2012 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Catalytic Activity of Copper Palladium Oxide Solid Solutions written by Gregory L. Christensen and published by . This book was released on 2018 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: CuxPd1-xO forms a homogeneous solid solution over the wide range of 0 ≤ x ≤ 0.725 in which compositional variation can be correlated with structural and chemical environmental changes. After a small lag at low Cu2+ concentrations, where the lattice cell parameters are pinned to that of the pure PdO structure, CuxPd1-xO lattice parameters follow Vegard’s law in which the cell volume decreases linearly with x, indicating a homogenous solution in which Cu2+ randomly replaces the larger Pd2+cation. The crystal structure also undergoes an increase in the c/a cell ratio, which relaxes the tetragonal distortion around the metal cation and shifts the metal-oxygen distance towards that of pure CuO (tenorite). X-ray photoelectron spectroscopy (XPS) shows a linear increase in Pd2+ 3d and Cu2+ 2p binding energies with increased Cu2+, a result of the increased Madelung energy and relaxation effects which occur during the photoemission process. XPS and Auger Electron Spectroscopy (AES) indicate that the surface composition is comparable to that of the bulk, and copper XPS Auger parameter analysis confirms a different, and variable, environment for copper in CuxPd1-xO than is found in pure tenorite. Solid solutions of CuxPd1-xO have been prepared with x values of 0, 0.2, 0.4, 0.6, and 1 for use as catalysts in the dehydrogenation of isopropanol to form acetone. Solid solution catalysts were shown to be less efficient catalysts when compared to mixtures of equal atomic composition. SEM images were obtained and showed morphology changes after heating of the samples. Surface area of the catalysts was determined by BET. UV/VIS was used to determine reactant and product concentrations. XPS data were obtained on the catalysts before and after the reactions, showing reduction of the catalyst occurred during catalysis.
Download or read book Synthesis Characterization and Catalytic Activity of Palladium II Imine Complexes in Heck Reaction written by Siti Rosilah Arsad and published by . This book was released on 2010 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Catalytic Activity of Palladium II Aroylhydrazone Complexes in Mizoroki heck Reaction written by Nur Hafizah Hassan and published by . This book was released on 2015 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Activity of Palladium Catalysts on the Dual Support of Cerium and Aluminum Oxides written by Jihyeon Park and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of sequence of impregnation (Pd on cerium oxides -alumina and cerium oxides on Pd-alumina) and calcination temperature (500 °C and 850 °C) on the catalytic oxidation of methane under lean conditions were investigated. The catalysts were prepared by a combination of impregnation, slurry and vortexing methods. The catalysts had 4.7 wt.% Pd and 10.7 wt.% Ce based on inductively coupled plasma optical emission spectrometry (ICP-OES) analysis. The catalysts were characterized by pulse chemisorption, temperature programmed reduction (TPD), scanning transmission electron microscopy (STEM), and X-ray photoelectron spectroscopy (XPS). The activity of the catalysts for methane combustion was measured in a fixed-bed flow reactor by flowing a gas mix (0.98 vol % methane, 4.01 vol % and balance nitrogen) through a catalytic bed. The temperature of the catalytic bed was controlled by a temperature -controlled tube furnace. The % methane in the effluent gas mix was measured by a gas chromatograph fitted with a flame ionization detector and a ‘Carbon Plot’ column. Palladium was present as PdO and PdOx x>2+ and cerium as CeOx (+3 and +4 oxidation states) as per XPS analysis. The activity of the Pd/cerium oxides-alumina500C catalyst was higher than the cerium oxides/Pd-alumina500C catalyst at 250-500 °C. Similar trends in the activity were seen for the two catalysts calcined at 850 °C. Higher dispersion and lower particle size, and the presence of small Pd particles on alumina accounted for the higher catalytic activities of the Pd/cerium oxides-alumina500C and 850C catalysts. The lower activities of cerium oxides/Pd-alumina500C and 850C were primarily due to the embedment of Pd onto ceria due to strong PdO-CeOx interactions. This research implies that the sequence of impregnation and calcination temperature could alter catalytic properties and activity for methane combustion through PdO/PdOx -support interactions.
Download or read book Developing a Sustainable Catalyst written by Corbin Kelsay Livingston and published by . This book was released on 2016 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterisation and Catalytic Activity of Gold Rhodium and Palladium Complexes Featuring Fluorinated N heterocyclic Carbene Ligands written by Mohamad Shazwan Shah Bin Jamil and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Catalytic Application of Novel and Immobilized Palladium and Ruthenium Complexes written by Matthew Ryan Sheets and published by . This book was released on 2008 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Palladium in Organic Synthesis written by Jiro Tsuji and published by Springer Science & Business Media. This book was released on 2005-07-06 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: with contributions by numerous experts
Download or read book Preparation Characterisation and Catalytic Activity of Palladium Silver and Silver based Nanoparticles written by Maciej Cabaj and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Catalytic Activity of Polyvinylpyridine Supported Palladium Nanoparticles in Sonogashira Coupling Reaction written by Nurul Sahida Hassan and published by . This book was released on 2012 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Clay Mineral Catalysis of Organic Reactions written by Benny K.G Theng and published by CRC Press. This book was released on 2018-07-27 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides insight into the working of clays and clay minerals in speeding up a variety of organic reactions. Clay minerals are known to have a large propensity for taking up organic molecules and can catalyse numerous organic reactions due to fine particle size, extensive surface area, layer structure, and peculiar charge characteristics. They can be used as heterogeneous catalysts and catalyst carriers of organic reactions because they are non-corrosive, easy to separate from the reaction mixture, and reusable. Clays and clay minerals have an advantage over other solid acids as they are abundant, inexpensive, and non-polluting.
Download or read book Synthesis Immobilization Strategies and Mechanistic Analysis of Surface supported Molecular Palladium Cross coupling Catalysts for Single molecule Fluorescence Spectroscopy written by Angela Marquard and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-molecule fluorescence spectroscopy is a compelling technique for studying the dynamics of catalytic reactions because heterogeneity in catalyst populations can be directly observed. Understanding the nature of diversity in catalyst behavior will lead to the design of better, more efficient catalysts. Synthetic challenges emerge when developing chemical systems for single-molecule spectroscopy techniques, because the molecules need to be fluorescently labeled and anchored to a surface for long-term imaging. A reliable attachment to the surface is critical for successful single-molecule spectroscopy investigations. Robust surface linkages play an important role in the stability and recyclability of surface-supported molecular catalysts as well. This thesis focuses on the design and synthesis of suitable fluorescent chemical systems for single-molecule fluorescence spectroscopy investigations of catalyst transformations and highlights the challenges related to developing and implementing surface attachment strategies for surface-supported molecular catalysts. A fluorescent Pd-PEPPSI precatalyst complex is designed and synthesized for single-molecule fluorescence spectroscopy experiments, and the mechanism of catalyst initiation is examined using both bulk NMR and single-molecule fluorescence spectroscopy. Various surface-attachment strategies are investigated for the immobilization of molecular Pd-PEPPSI complexes onto both polymers and metal oxides. Multiple characterization techniques are employed to analyze the nature of the surface linkage chemistries and gain insight into the stability and degradation mechanisms of surface-supported molecular palladium catalysts.
Download or read book Synthesis Characterization Biological and Catalytic Studies of Tridentate Monothiosemicarbazone Palladium II Complexes written by Prinessa Chellan and published by . This book was released on 2009 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Palladium Reagents and Catalysts written by Jiro Tsuji and published by . This book was released on 1995 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: Basic chemistry of organopalladium compounds; Classification of the reactions involving Pd(II) compounds and Pd(O) complexes.
Download or read book Tuning Palladium Selective Oxidation Catalysts Via Mesoporous Supports written by Christopher Michael A. Parlett and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Surfactant templating provides a facile route to mesoporous materials with tuneable architectures, whilst simultaneously allowing control over complementary macro and micro porosity. The impact of these varying physical properties, on both catalyst synthesis and during catalytic reactions, was one principal area of investigation. Catalyst series were prepared on mesoporous SBA-15, SBA-16 and KIT-6, meso-macroporous SBA-15, true liquid crystal templated SBA-15 and a commercial low surface area silica support. Additionally two mesoporous alumina series, with mesoporosity akin to SBA-15, were produced. The catalytic activity of the materials was screened for the selective oxidation of allylic alcohols, which represents a class of industrially relevant chemical upgrading reactions. Nanoparticulate palladium is widely recognised as an able catalytic species, although the active site nature is still debated with both metallic and oxidic surfaces proposed. Further insight into the active species was another major area of investigation. Extensive characterisation confirmed successful support synthesis and mesopore stability after palladium impregnation. Irrespective of support, decreasing metal loading elevates dispersion (particles sizes are typically less than 2nm), which correlates with the increase of surface PdO content. In relation to the silica supports these trends escalate via support transition in the order of: Pd/low surface area commercial silica
