Download or read book Simultaneous SO2 NOx Abatement Using Zeolite supported Copper Oxide written by Mark G. White and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simultaneous SO2 NO3 Abatement Using Zeolite supported Copper Progress Report October 1 1992 December 31 1992 written by and published by . This book was released on 1994 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proposed research seeks to advance/improve current flue gas cleanup catalyst technology by modifying promising copper-exchanged zeolite NO decomposition catalysts which reduce NO to elemental nitrogen and oxygen in the absence of an added reducing gas. The authors believe that this approach has great potential. Copper on alumina has been investigated by the Pittsburgh Energy Technology Center (PETC) as a NOx/SO2 abatement catalyst. Copper on alumina acts as a sorbent for SO2, forming a surface sulfate upon adsorption in an oxygen-containing atmosphere, and as a catalyst for selective catalytic reduction (SCR) of NOx using ammonia; both CuO and CuSO4 on the surfaces of these materials are active SCR catalysts. SO2 adsorption in the PETC studies was carried out at 673K, a temperature well within the range for active NO decomposition by the Cu-ZSM-5 catalyst. The authors believe that by beginning with a material which decomposes NO without needing an added reducing gas, they will be able to design a catalyst which will act as a regenerable NOx/SO2 abatement catalyst which does not need ammonia to accomplish NOx reduction, and which will accomplish SO2 abatement by adsorption, similar to the copper on alumina catalyst. Coupled with a SO2 oxidation catalyst, this successful system will be able to remove both NOx and SO2 from flue gases with no added reducing agent and no waste.
Download or read book Simultaneous SO2 NO3 Abatement Using Zeolite supported Copper Progress Report October 1 1995 September 30 1996 written by and published by . This book was released on 1996 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The bulk of the results from this project, besides being found in the research reports, are in the form of two theses presented for advanced degrees by two different students at two different institutions. Francis E. Porbeni is a Masters̀ Degree student in Chemistry at Clark Atlanta University and has prepared his Masters̀ Thesis entitled Simultaneous SO2 Oxidation and NO Decomposition over Copper Oxide on?-Alumina Catalysts: An Infrared Diffuse Reflectance Study. Sumit Rao, a Ph. D. student in Chemical Engineering at the Georgia Institute of Technology has defended his thesis entitled Role of Copper Ensemble Size in Silica and Zeolite Supported Catalysts for Nitric Oxide Decomposition. These two documents, which will be forwarded when final copies are available, provide the details of the bulk of the research accomplished over the duration of this project. These two documents are summarized, and other results from the project are given.
Download or read book Simultaneous SO2 No3 Abatement Using Zeolite supported Copper Progress Report October 1 December 31 1995 written by and published by . This book was released on 1995 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron paramagnetic resonance (EPR) spectroscopy has been used to investigate the nature of copper ions supported on oxides and on zeolites. The results show that, unfortunately, EPR may not be a very useful predictor of the catalytic activity of supported copper catalysts.
Download or read book Simultaneous SO2 NO3 Abatement Using Zeolite Supported copper Progress Report April 1 June 30 1996 written by and published by . This book was released on 1996 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors have continued the investigation of the adsorption of NO on the Cu/?-alumina samples and have begun the study of the interaction of NO with sulfated Cu/?-alumina. The interaction of NO with a sulfated surface is extremely important, since the copper sites in the most popular NO reduction catalyst, Cu/ZAM-5, also adsorb SO2, and the catalyst is poisoned by SO2. It may be possible to determine whether the poisoning mechanism is due to a chemical effect, or some other effect, and investigate measures which might alleviate the deleterious effects of surface sulfation on the adsorption/reduction process. The results for NO interacting with the sulfated surface do not appear to result in the formation of any new species, but do show a dramatic change in the relative amounts of the NO species formed on the surface. The sulfation of the copper species apparently forces the copper species to remain as Cu{sup 2+}, which gives rise to a strong band at 1850 cm−1, shifted to lower frequency from the 1863 cm−1 absorption found for the unsulfated catalyst, but which is still probably due to the formation of a Cu{sup 2+}/NO complex, given the small frequency shift. Two other infrared absorption bands observed for NO adsorbed on the un-sulfated catalyst are observed in the current study only weakly, and are due to the formation of adsorbed NO2, the NO oxidation product formed when Cu{sup 2+} is reduced to Cu, and to the Cu+/NO− complex. The relatively intense absorption due to the Cu{sup 2+}/NO complex and the weak absorptions due to adsorbed NO2 and the Cu+/NO− complex indicate that little reduction of the copper has taken place. Stabilization of the Cu species as Cu{sup 2+} by the sulfate apparently prevents participation of the surface copper species in the redox cycle. To the authors̀ knowledge this is the first reported infrared spectroscopic study of NO interacting with a sulfated Cu/?-alumina catalyst.
Download or read book Simultaneous SO2 NO3 Abatement Using Zeolite supported Copper Progress Report April 1 June 30 1995 written by and published by . This book was released on 1995 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several catalysts for NO decomposition have been reported in the literature to include the following: Cu/ZSM-5; Cu/Zeolite-Y; Cu/mordenite; Cu/? zeolite; Cu/alumina; and Cu/silica which have been studied less than Cu/ZSM-5. The catalytic properties for NO conversion are found to be different on these samples with the ZSM-5 supported catalysts showing the highest activity in a dry environment free from sulfur oxides. One of the goals of this study is to have a better fundamental understanding on the different roles of Cu and the support in the catalytic reaction. The authors use stable, cationic metal complexes in non-aqueous solvents as sources of the Cu ions in producing model catalysts for which the fate of the source molecule is known and is controlled during the ion exchange/impregnation. Molecular models of these systems can be used to identify the possible configurations of the metal complexes within the zeolite support. The authors compare the performance of the model catalysts to one prepared by aqueous impregnation of ZSM-5 zeolite. The performance of the dinuclear metal complex on silica is compared to the same complex in ZSM-5 and Y-zeolites.
Download or read book Simultaneous SO2 NO3 Abatement Using Zeolite Supported Copper Quarterly Progress Report October 1 1994 December 31 1994 written by and published by . This book was released on 1994 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have made progress in characterizing a Cu-exchanged ZSM-5 for NO decomposition activity. Additionally, we are pursuing the impregnation of alumina with vanadium and copper and studying the adsorption and reaction of SO2 on these catalysts.
Download or read book Simultaneous SO2 NO3 Abatement Using Zeolite supported Copper Progress Report January 1 March 31 1996 written by and published by . This book was released on 1996 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors have begun the investigation of the adsorption of NO on the Cu/?-alumina samples. The object of this aspect of the project is to investigate the modes of adsorption of NO on the Cu/?-alumina sorbents, to investigate the potential activity of these materials for the catalysis of the reduction of NO. Additionally, when subsequent measurements of NO interacting with a sulfated sorbent are investigated, a baseline of data will have been obtained which can be used to evaluate the effects of surface sulfation on the adsorption process in the absence of other competing effects. Based on the current results and by comparing results with those found by others, the authors have determined that the copper species exist predominantly as isolated copper atoms on the aluminum oxide surface, which behave chemically as copper aluminate. The copper species is responsible for the formation of an NO/Cu{sup 2+} complex which gives rise to an infrared absorption at 1,863 cm−1. There do exist some Cu species on the surface, which are formed only after some time by an interaction with NO, which give rise to an NO−/Cu+ complex with an infrared absorption at approximately 1,700 cm−1. Additionally, an intense feature at 1,640 cm−1 is observed which may be due to NO2 on the surface, which is the expected oxidation product if NO reduces Cu from Cu{sup 2+} to Cu+.
Download or read book Simultaneous SO sub 2 NO sub X Abatement Using Zeolite supported Copper Progress Report October 1 1995 September 30 1996 written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The bulk of the results from this project, besides being found in the research reports, are in the form of two theses presented for advanced degrees by two different students at two different institutions. Francis E. Porbeni is a Master's Degree student in Chemistry at Clark Atlanta University and has prepared his Master's Thesis entitled Simultaneous SO[sub 2] Oxidation and NO Decomposition over Copper Oxide on[gamma]-Alumina Catalysts: An Infrared Diffuse Reflectance Study. Sumit Rao, a Ph. D. student in Chemical Engineering at the Georgia Institute of Technology has defended his thesis entitled Role of Copper Ensemble Size in Silica and Zeolite Supported Catalysts for Nitric Oxide Decomposition. These two documents, which will be forwarded when final copies are available, provide the details of the bulk of the research accomplished over the duration of this project. These two documents are summarized, and other results from the project are given.
Download or read book Simultaneous SO2 written by and published by . This book was released on 1994 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proposed research seeks to advance/improve current flue gas cleanup catalyst technology by modifying promising copper-exchanged zeolite NO decomposition catalysts which reduce NO to elemental nitrogen and oxygen in the absence of an added reducing gas. The authors believe that this approach has great potential. Copper on alumina has been investigated by the Pittsburgh Energy Technology Center (PETC) as a NO(subscript x)/SO2 abatement catalyst. Copper on alumina acts as a sorbent for SO2, forming a surface sulfate upon adsorption in an oxygen-containing atmosphere, and as a catalyst for selective catalytic reduction (SCR) of NO(subscript x) using ammonia; both CuO and CuSO4 on the surfaces of these materials are active SCR catalysts. SO2 adsorption in the PETC studies was carried out at 673K, a temperature well within the range for active NO decomposition by the Cu-ZSM-5 catalyst. The authors believe that by beginning with a material which decomposes NO without needing an added reducing gas, they will be able to design a catalyst which will act as a regenerable NO(subscript x)/SO2 abatement catalyst which does not need ammonia to accomplish NO(subscript x) reduction, and which will accomplish SO2 abatement by adsorption, similar to the copper on alumina catalyst. Coupled with a SO2 oxidation catalyst, this successful system will be able to remove both NO(subscript x) and SO2 from flue gases with no added reducing agent and no waste.
Download or read book Selective Catalytic Reduction of NOx written by Oliver Kröcher and published by MDPI. This book was released on 2018-12-14 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Selective Catalytic Reduction of NOx" that was published in Catalysts
Download or read book Simultaneous Removal of SO2 and NOx from Flue Gas Employing a Fluidized bed Copper Oxide Process written by Richard J. Demski and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Simultaneous SO2 NOX Control Technology written by Kevin R. Bruce and published by . This book was released on 1993 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Clean Air Act Amendments of 1990 (CAAA) have led to accelerated research into novel sulfur dioxide (SO2) and nitrogen oxide (NOx) control technologies for coal-fired industrial boilers. One of these technologies combines sorbent injection and selective non-catalytic reduction for simultaneous SO2/NOx removal. The work presented herein concentrated on characterizing three process operational parameters of this technology: injection temperature, sorbent type, and reductant/pollutant stoichiometric ratio. A slurry composed of a urea-based solution (NOx OUT A or NOx OUT A+) and various calcium-(Ca-) based sorbents was injected at a range of temperatures and reactant/pollutant stoichiometries in a natural-gas-fired, pilot-scale reactor with doped pollutants. Up to 80% reduction of SO2 and NOx at reactant/pollutant stoichiometric ratios of 2 and 1.5, respectively, was achieved. SO2 emission reductions from slurry injection were enhanced moderately when compared with dry sorbent injection methods, possibly caused by sorbent fracturing to smaller, more reactive particles. Emissions from ammonia (NH3) slip (unreacted nitrogen-based reducing agent) and nitrous oxide (N2O) formation were reduced in comparison with other published results, while similar NOx reductions were obtained. increased carbon monoxide (CO) emissions, caused by the decomposition of urea, were moderate. Emissions of CO, NH3, and N2O for the enhanced urea solution (NOx OUT A+) were substantially less than the levels observed during urea (NOx OUT A) injection. The injection of the urea-based solution enhanced SO2 removal, probably because of the formation of (NH4)2CA(SO4)2 H2O. The results of this pilot-scale study have shown high reduction of both SO2 and NOx.
Download or read book Acid Precipitation written by and published by . This book was released on 1986 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-11 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microwave Chemistry written by Giancarlo Cravotto and published by Walter de Gruyter GmbH & Co KG. This book was released on 2017-09-25 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microwave Chemistry has changed the way to work in chemical laboratories and is an established state-of-the-art technology to accelarate and enhance chemical processes. This book not only gives an overview of the technology, its historical development and theoretical background, but also presents its exceptionally broad spectrum of applications. Microwave Chemistry enables graduate students and scientist to learn and apply its methods successfully.
Download or read book Atlas of Zeolite Framework Types written by Ch. Baerlocher and published by Elsevier. This book was released on 2007-09-12 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zeolite scientists, whether they are working in synthesis, catalysis, characterization or application development, use the Atlas of Zeolite Framework Types as a reference. It describes the main features of all of the confirmed zeolite framework structures, and gives references to the relevant primary structural literature. Since the last edition 34 more framwork types have been approved and are described in this new edition. A further new feature will be that characteristic building units will be listed for each of the framework types.Zeolites and their analogs are used as desiccants, as water softeners, as shape-selective acid catalysts, as molecular sieves, as concentrators of radioactive isotopes, as blood clotting agents, and even as additives to animal feeds. Recently, their suitability as hosts for nanometer spacing of atomic clusters has also been demonstrated. These diverse applications are a reflection of the fascinating structures of these microporous materials. Each time a new zeolite framework structure is reported, it is examined by the Structure Commission of the International Zeolite Association (IZA-SC), and if it is found to be unique and to conform to the IZA-SC's definition of a zeolite, it is assigned a 3-letter framework type code. This code is part of the official IUPAC nomenclature for microporous materials. The Atlas of Zeolite Framework Types is essentially a compilation of data for each of these confirmed framework types. These data include a stereo drawing showing the framework connectivity, features that characterize the idealized framework structure, a list of materials with this framework type, information on the type material that was used to establish the framework type, and stereo drawings of the pore openings of the type material. Clear stereo drawings of each of the framework types Description of the features of the framework type, allowing readers to quickly see if the framework type is suitable to their needs References to isotypic materials, readers can quickly identify related materials and consult the appropriate reference
