Download or read book Reduction of Azide Nitrite Nitric Oxide and Nitrous Oxide by Hydrogen with Pd and Pd Cu Catalysts in Water written by Michael F. Fanizza and published by . This book was released on 2009 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalytic Reduction of NO and N2O with Hydrogen in Water by Polymer Protected Palladium Nanoparticles written by Kathleen H. Kelley and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitric oxide (NO) and nitrous oxide (N2O) are important components of the global nitrogen cycle. They are intermediates or end products for natural bacterial processes such as nitrification and denitrification, and are formed in increasing amounts from anthropogenic sources such as increased bacterial denitrification of fertilizers. Both are contributors to ozone destruction, and N2O is a potent greenhouse gas. Reduction of both gases to harmless dinitrogen by nanoparticulate palladium catalysts is a promising method for treating NO and N2O formed in water. However, creating a better understanding of the method of catalytic activity and corresponding selectivity is critical for developing an optimal process. We have synthesized a water-soluble Pd/PVP colloid (PVP= poly(N-vinyl-2-pyrrolidone) by an alcohol reduction method. Nitric oxide and nitrous oxide reduction activities were determined by monitoring the headspace composition in a reaction flask by GC-MS. NO reduction rates were considerably faster than N2O reduction rates, and essentially no production of N2 was observed until all of the NO had been reduced to N2O. This is consistent with expectations that the binding constant of NO to the palladium nanoparticle surface is considerably larger than that of N2O. Molar balances and post-experimental ammonia analysis confirmed that no side production of ammonia was occurring. Further studies showed that no reaction occurred with an air-exposed catalyst until hydrogen added in a helium atmosphere was sufficient to remove oxygen from the surface. Hydrogen held by the Pd nanoparticles was modified by controlled heating under helium in order to confirm the need for hydrogen in N2 production from N2O.

Download or read book Reduction of Nitric Oxide by Hydrogen on Copper nickel Catalysts written by Steven Alan Tunick and published by . This book was released on 1973 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Kinetics of Nitric Oxide Reduction with Hydrogen Over Palladium Supported on Alumina written by Charissa Maria Rigano and published by . This book was released on 1993 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Elucidation of Nitrate Reduction Mechanisms on a Pd In Bimetallic Catalyst Using Isotope Labeled Nitrogen Species written by Rui Zhang and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalytic hydrogenation over Pd-based catalysts has emerged as an effective treatment approach for nitrate (NO3-) removal, but its full-scale application for direct treatment of drinking water or ion exchange regenerant brines requires improved selectivity for the end-product dinitrogen (N2) over toxic ammonia species (NH4+, NH3). A key to improving N2 versus NH4+ production is to elucidate nitrate reduction pathways and identify the key intermediate(s) that determine selectivity. To address this challenge, aqueous reduction experiments with an Al2O3-supported Pd/In bimetallic catalyst were conducted using isotope-labeled nitrite (15NO2-), the first reduction intermediate of NO3-, alone and in combination with unlabeled proposed reduction intermediates (N2O, NO), and using N2O and NO alone, each as a starting reactant. Use of 15N-labeled species eliminated interference from ambient 14N2 when assessing mass balances and product distributions. Simultaneous catalytic reduction of 15NO2- and 14N2O showed no isotope mixing in the final N2 product, demonstrating that N2O does not react with other NO2- reduction intermediates. N2O reduction alone also yielded only N2, verifying that N2O reduction occurs after the reaction step controlling final N2/NH4+ product distribution. In contrast, simultaneous catalytic reduction of 15NO2- and 14NO yielded mixed-labeled N2 (mass 29), and 15NO reduction alone yielded both N2 and NH4+, indicating that NO is a key intermediate involved in determining final product selectivity. N2/NH4+ product selectivity was also evaluated as a function of varying initial 15NO concentration, and results show that selectivity for N2 increases with initial NO concentration to a point, above which product selectivity remains unchanged. This trend is attributed to the increasing importance of N-N pairing reactions leading to N2O formation as the concentration of catalyst-adsorbed NO (NOads) increases to a point of saturating available adsorption sites, above which no further increases in N2 selectivity occur. These results are important because they yield mechanistic insights into the NO3- reduction pathway and information on how catalytic reduction processes can be optimized to maximize N2 production over NH4+.

Download or read book Nitric Oxide Reduction with Hydrogen Over Carbon supported Copper iron Oxides Catalysts written by Ibrahim Yakub 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 British Chemical Abstracts written by and published by . This book was released on 1926 with total page 1304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalytic Nitrate Reduction in Water written by Priyanka Gheek and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We chose to study the catalytic conversion of dissolved nitrate, which are a major cause of water contamination. It is a complex process into several steps following the reaction: NO3- → NO2-→ [NO] → N2 + NH4+ + + OH- The scientific goal of this thesis was to determine a relationship between the physico-chemical structure of catalysts and their activity and selectivity in the reduction of nitrates. The reaction kinetics were also studied in relation to the structure of catalysts. The work focused around the following points: 1. Preparation of catalyst supports: Two main groups of materials were studied: carbon materials and inorganic materials that have been modified by acid or base treatment or by deposit oxides (Al2O3, ZrO2 alone or in mixture). 2. Synthesis of catalyst: oxides of noble and transition metals have been established on the supports. Systems with monometallic Pt and Pd and bimetallic Pd-Cu have been studied and characterized by many techniques. The effectiveness of these materials was determined depending on their catalytic activity. 3. Determination of the catalytic properties: The role and effect of parameters such as support, type of medium, active phase composition, the presence of inorganic salts in the reaction medium, nature of reducing on the rate of nitrate reduction and selectivity of the reactions were widely studied. The debate highlights the combination support / most effective catalyst for denitrification of drinking water

Download or read book Sci tech Book Profiles written by and published by . This book was released on 1965 with total page 1208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes title page, table of contents, list of contributors, preface and all indexes of each book.

Download or read book Catalytic Aerobic Oxidations written by Esteban Mejía and published by Royal Society of Chemistry. This book was released on 2020-07-15 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oxidation reactions are an important chemical transformation in both academia and industry. Among the major advances in the field has been the development of catalytic processes, which are not only selective and efficient, but also allow the replacement of common stoichiometric oxidants with molecular oxygen, ideally from air at atmospheric pressure. This results in processes with higher atom efficiency, where water is the only side product in line with the principles of green chemistry. Focusing on the use of molecular oxygen as the terminal oxidant, this book covers recent advances in both heterogeneous and homogeneous systems, with and without metals and on the "taming" of the highly reactive oxygen gas by use of micro-flow reactors and membranes. A useful reference for industrial and academic chemists working on oxidation processes, as well as green chemists.

Download or read book Comprehensive Dissertation Index 1861 1972 Chemistry written by Xerox University Microfilms and published by . This book was released on 1973 with total page 958 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Chemical News and Journal of Industrial Science written by and published by . This book was released on 1905 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sustainable Ammonia Production written by Inamuddin and published by Springer Nature. This book was released on 2020-01-09 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents sustainable synthetic pathways and modern applications of ammonia. It focuses on the production of ammonia using various catalytic systems and its use in fuel cells, membrane, agriculture, and renewable energy sectors. The book highlights the history, investigation, and development of sustainable pathways for ammonia production, current challenges, and state-of-the-art reviews. While discussing industrial applications, it fills the gap between laboratory research and viable applications in large-scale production.

Download or read book The Chemical News and Journal of Physical Science written by and published by . This book was released on 1905 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalytic Air Pollution Control written by Ronald M. Heck and published by John Wiley & Sons. This book was released on 2016-03-07 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalytic Air Pollution Control: Commercial Technology is the primary source for commercial catalytic air pollution control technology, offering engineers a comprehensive account of all modern catalytic technology. This Third Edition covers all the new advances in technology in automotive catalyst control technology, diesel engine catalyst control technology, small engine catalyst control technology, and alternate sustainable fuels for auto and diesel.

Download or read book The Chemical News written by and published by . This book was released on 1905 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nanocatalysis written by Vivek Polshettiwar and published by John Wiley & Sons. This book was released on 2013-09-06 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exhibiting both homogeneous and heterogeneous catalytic properties, nanocatalysts allow for rapid and selective chemical transformations, with the benefits of excellent product yield and ease of catalyst separation and recovery. This book reviews the catalytic performance and the synthesis and characterization of nanocatalysts, examining the current state of the art and pointing the way towards new avenues of research. Moreover, the authors discuss new and emerging applications of nanocatalysts and nanocatalysis, from pharmaceuticals to fine chemicals to renewable energy to biotransformations. Nanocatalysis features contributions from leading research groups around the world. These contributions reflect a thorough review of the current literature as well as the authors’ first-hand experience designing and synthesizing nanocatalysts and developing new applications for them. The book’s nineteen chapters offer a broad perspective, covering: Nanocatalysis for carbon-carbon and carbon-heteroatom coupling reactions Nanocatalysis for various organic transformations in fine chemical synthesis Nanocatalysis for oxidation, hydrogenation, and other related reactions Nanomaterial-based photocatalysis and biocatalysis Nanocatalysts to produce non-conventional energy such as hydrogen and biofuels Nanocatalysts and nano-biocatalysts in the chemical industry Readers will also learn about the latest spectroscopic and microscopy tools used in advanced characterization methods that shed new light on nanocatalysts and nanocatalysis. Moreover, the authors offer expert advice to help readers develop strategies to improve catalytic performance. Summarizing and reviewing all the most important advances in nanocatalysis over the last two decades, this book explains the many advantages of nanocatalysts over conventional homogeneous and heterogeneous catalysts, providing the information and guidance needed for designing green, sustainable catalytic processes.