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Spectroscopic Characterization Of Palladium Based Catalysts Supported On Titania Prepared By Sol Gel For Reduction Of Nitrogen Oxides Using Methane
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Book Synopsis Spectroscopic Characterization of Palladium Based Catalysts Supported on Titania Prepared by Sol-gel for Reduction of Nitrogen Oxides Using Methane by : Junko Mitome Watson
Download or read book Spectroscopic Characterization of Palladium Based Catalysts Supported on Titania Prepared by Sol-gel for Reduction of Nitrogen Oxides Using Methane written by Junko Mitome Watson and published by . This book was released on 2001 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2002 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2001 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis, Characterization and Activity of Palladium Catalysts on the Dual Support of Cerium and Aluminum Oxides by : Jihyeon Park
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.
Book Synopsis Applied Science & Technology Index by :
Download or read book Applied Science & Technology Index written by and published by . This book was released on 1997 with total page 2948 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis, Characterization and Catalytic Evaluation of TiO2-based Sol/gel-made Catalysts Supported V2O5 for the Removal of NOx in the Presence of Benzene by : Nicolaos Economidis
Download or read book Synthesis, Characterization and Catalytic Evaluation of TiO2-based Sol/gel-made Catalysts Supported V2O5 for the Removal of NOx in the Presence of Benzene written by Nicolaos Economidis and published by . This book was released on 1998 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environmental Catalysis by : F J J G Janssen
Download or read book Environmental Catalysis written by F J J G Janssen and published by World Scientific. This book was released on 1999-04-14 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together highlights of a theme which is growing in interest: the creation of a sustainable society using catalysis as the main tool. Catalysts play key roles in the production of clean fuels, the conversion of waste and green raw materials into energy, clean combustion engines including control of NOx and soot production and reduction of greenhouse gases, production of clean water and of polymers, as well as reduction from polymers to monomers. Catalysts are also of prime importance in the developing H2 and syngas production technology, aimed at producing clean fuels for the coming decades. And catalysts can be recycled.
Book Synopsis Supported Catalysts and Their Applications by : David C Sherrington
Download or read book Supported Catalysts and Their Applications written by David C Sherrington and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need to improve both the efficiency and environmental acceptability of industrial processes is driving the development of heterogeneous catalysts across the chemical industry, including commodity, specialty and fine chemicals and in pharmaceuticals and agrochemicals. Drawing on international research, Supported Catalysts and their Applications discusses aspects of the design, synthesis and application of solid supported reagents and catalysts, including supported reagents for multi-step organic synthesis; selectivity in oxidation catalysis; mesoporous molecular sieve catalysts; and the use of Zeolite Beta in organic reactions. In addition, the two discrete areas of heterogeneous catalysis (inorganic oxide materials and polymer-based catalysts) that were developing in parallel are now shown to be converging, which will be of great benefit to the whole field. Providing a snapshot of the state-of-the-art in this fast-moving field, this book will be welcomed by industrialists and researchers, particularly in the agrochemicals and pharmaceuticals industries.
Book Synopsis Nitric Oxide Selective Catalytic Reduction with Methane by : Enrique Aceves
Download or read book Nitric Oxide Selective Catalytic Reduction with Methane written by Enrique Aceves and published by . This book was released on 2000 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reactivity and Characterization of Supported Noble Metal Catalysts by : Keishla R. Rivera-Dones
Download or read book Reactivity and Characterization of Supported Noble Metal Catalysts written by Keishla R. Rivera-Dones and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalytically driven processes account for over ninety percent of industrial chemical manufacturing today. Developments in manufacturing processes are largely driven by continued improvements in catalytic materials, which aim to increase production volumes while minimizing costs along with safety and environmental hazards. In order to achieve these goals, however, a rational approach in catalyst design must be pursued that aims to understand and build upon the fundamental structural, electronic, and chemical properties governing catalytic performance. To that purpose, the work presented in this dissertation makes use of kinetic experiments, theoretical models, and advanced characterization techniques to generate a fundamental understanding of noble metal surfaces employed in a variety of catalytic reaction systems. In Chapter 2, we discuss the use of N2 physisorption, CO chemisorption, and NH3 temperature programed desorption to evaluate the effect of support acidity on the reactivity profiles of various zeolite-supported Pt and Pt-Sn catalysts for the non-oxidative coupling of methane to ethylene and aromatics. Reactivity studies for Pt-Sn/H-ZSM-5 catalysts at 973 K showed that, while all catalysts produced ethylene as the primary product, increasing support acidity led to an increase in naphthalene selectivity at the expense of benzene selectivity. Volcano-shaped profiles observed for the generation of aromatic products suggest that the formation of a reactive hydrocarbon pool on acidic support surfaces could be responsible for the oligomerization of ethylene. Notably, the Pt-Sn/H-ZSM-5 (SiO2:Al2O3 = 50) catalyst was found to be comparable to the state-of-the-art Mo/H-ZSM-5 catalysts in terms of carbon product generation and resistance to coke formation. In Chapter 3, x-ray absorption spectroscopy (XAS) was used to highlight the effect of local electronic and structural environments in specially synthesized metallic catalysts. The local coordination and nearest-neighbor distance of Pd species were evaluated to understand metal dispersion and the effect of catalyst support on the extent of bimetallic particle formation in Pd, AgPd, CuPd, and AuPd catalysts synthesized by controlled surface reactions (CSR) for a variety of amination, hydrodechlorination, and hydrogenation reactions. Near-edge structure analyses were also used on these Pd catalysts, as well as on a set of Mo-containing multi-metallic catalysts prepared by atomic layer deposition (ALD) for synthesis gas conversion, to understand catalyst reducibility along with potential support and hydrogen spillover effects on the extent of metal reduction. Chapter 4 evaluates the effects of catalyst support and pretreatment conditions on the hydrogenation of acetone over SiO2-, Al2O3-, and ZSM-5-supported platinum catalysts. Pt/ZSM-5 catalysts were found to have specific conversion rates and turnover frequencies that were 2 - 3 orders of magnitude higher than those observed over Pt/SiO2 and Pt/Al2O3 catalysts, regardless of zeolite acidity or pretreatment conditions. For Pt/ZSM-5 catalysts, the higher activity was achieved by increasing calcination and decreasing reduction temperatures, likely due to the effects of these treatments on the morphology of the platinum particles. CO-FTIR measurements showed a shift to higher frequencies of the Pt-CO band in Pt/ZSM-5 catalysts compared to Pt/SiO2, which alluded to the interactions between Pt and the porous zeolite structure as a source of the activity enhancements observed. Chapter 5 introduces the use of transient kinetics studies and theoretical modeling to explore the importance of surface coverage effects in the hydrogenation of acetone over platinum. Transient models based on steady-state microkinetics using static and dynamic inclusion of surface coverage via the Langmuir and Bragg-Williams approximations, respectively, predicted notable differences in the decay profiles of the most abundant reactive intermediate (MARI) from the catalytic surface. Experimental studies using steady-state isotopic transient kinetic analysis (SSITKA) methods served to validate the theoretical predictions for transients induced by complete acetone removal from or its substitution in the reactant feed and provided tangible evidence for the importance of surface coverage effects in understanding the reactivity of platinum catalysts for acetone hydrogenation. Lastly, Chapter 6 addresses possible future research directions in the field of transient kinetics studies.
Book Synopsis Catalytic Application of Nano-Gold Catalysts by : Neeraj Kumar Mishra
Download or read book Catalytic Application of Nano-Gold Catalysts written by Neeraj Kumar Mishra and published by BoD – Books on Demand. This book was released on 2016-08-31 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gold, considered catalytically inactive for a long time, is now a fascinating partner of modern chemistry, as scientists such as Bond, Teles, Haruta, Hutchings, Ito and Hayashi opened new perspectives for the whole synthetic chemist community. Recently gold has attracted significant attention due to its advantageous characteristics as a catalytic material and since it allows easy functionalization with biologically active molecules. In this context, when gold is prepared as very small particles, it turns out to be a highly active catalyst. However, such a phenomenon completely disappears when the gold particle size grows into the micrometer range. Therefore, the preparation for obtaining an active gold catalyst is so important. The primary objective of this book is to provide a comprehensive overview of gold metal nanoparticles and their application as promising catalysts.
Book Synopsis Catalytic Hydrogenation over Platinum Metals by : Paul Rylander
Download or read book Catalytic Hydrogenation over Platinum Metals written by Paul Rylander and published by Elsevier. This book was released on 2012-12-02 with total page 565 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalytic Hydrogenation over Platinum Metals focuses on catalytic hydrogenation as an effective process in attaining controlled transformations of organic compounds. Composed of contributions of various authors, the book first provides information on catalysts, equipment, and conditions. Catalyst stability and reuse; types of catalyst; platinum metals; and synergism are covered. The text proceeds with discussions on hydrogenation reactors. Topics include atmospheric pressure reactors; low pressure reactors; microreactors; and high pressure reactors. The book also covers hydrogenation of carbon-carbon unsaturation. Catalytic metal; modified catalyst systems; stereochemistry; diacetylenes; and hydrogenolysis are discussed. The text also looks at the hydrogenation of aromatics, nitrogen and carbonyl compounds, and hydrogenolysis. Numerical representations and analysis, diagrams, and reactions of compounds when exposed to different laboratory conditions are considered. The selection is a great source of data for readers interested in studying the process of catalytic hydrogenation.
Book Synopsis Spectroscopic Investigation of Palladium Catalysts During Wet Methane Oxidation by :
Download or read book Spectroscopic Investigation of Palladium Catalysts During Wet Methane Oxidation written by and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Metal Nanoparticles for Catalysis by : Franklin Tao
Download or read book Metal Nanoparticles for Catalysis written by Franklin Tao and published by Royal Society of Chemistry. This book was released on 2014-06-12 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysis is a central topic in chemical transformation and energy conversion. Thanks to the spectacular achievements of colloidal chemistry and the synthesis of nanomaterials over the last two decades, there have also been significant advances in nanoparticle catalysis. Catalysis on different metal nanostructures with well-defined structures and composition has been extensively studied. Metal nanocrystals synthesized with colloidal chemistry exhibit different catalytic performances in contrast to metal nanoparticles prepared with impregnation or deposition precipitation. Additionally, theoretical approaches in predicting catalysis performance and understanding catalytic mechanism on these metal nanocatalysts have made significant progress. Metal Nanoparticles for Catalysis is a comprehensive text on catalysis on Nanoparticles, looking at both their synthesis and applications. Chapter topics include nanoreactor catalysis; Pd nanoparticles in C-C coupling reactions; metal salt-based gold nanocatalysts; theoretical insights into metal nanocatalysts; and nanoparticle mediated clock reaction. This book bridges the gap between nanomaterials synthesis and characterization, and catalysis. As such, this text will be a valuable resource for postgraduate students and researchers in these exciting fields.
Book Synopsis Spectroscopic Characterization of Supported Metal Oxide Catalysts by : Michael Andrew Vuurman
Download or read book Spectroscopic Characterization of Supported Metal Oxide Catalysts written by Michael Andrew Vuurman and published by . This book was released on 1992 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Surface Photochemistry by : Masakazu Anpo
Download or read book Surface Photochemistry written by Masakazu Anpo and published by John Wiley & Sons. This book was released on 1996-10-21 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first volume in the series brings together the latest developments in solid surface photochemistry, providing insights into the most up to date research activities on light-initiated chemical reactions. The book offers a comprehensive study of the photochemical and photophysical properties of molecules on various surfaces like zeolites, metals and metal oxides. Chapter 1 discusses the nature of the photochemical and photophysical reactions occurring on solid surfaces. Subsequent chapters deal with a description of the dynamical aspects of surface photohemistry, a study of the specific nature of photochemistry of molecules included within zeolite cavities and a comprehensive study of the reactivities of photo-generated electron-hole pair states involved in photo-induced and photocatalytic reactions. The book also investigates many possible and actual key applications of solid surface photochemistry, such as molecular photo-devices, photo-chemical vapour deposition of thin layered semiconductors, sensitive optical media and control of photochemical reaction paths as well as efficient photocatalytic reaction processes which will be indispensable for ecologically clean and safe chemical systems. Surface Photochemistry will be of interest to researchers in surface science and also to graduate students interested in catalysis or photo-chemistry. It will be valuable as a reference book for academics in many aspects of materials science.
