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Catalyst And Method For Reduction Of Nitrogen Oxides
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Book Synopsis Catalyst and Method for Reduction of Nitrogen Oxides by :
Download or read book Catalyst and Method for Reduction of Nitrogen Oxides written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A Selective Catalytic Reduction (SCR) catalyst was prepared by slurry coating ZSM-5 zeolite onto a cordierite monolith, then subliming an iron salt onto the zeolite, calcining the monolith, and then dipping the monolith either into an aqueous solution of manganese nitrate and cerium nitrate and then calcining, or by similar treatment with separate solutions of manganese nitrate and cerium nitrate. The supported catalyst containing iron, manganese, and cerium showed 80 percent conversion at 113 degrees Celsius of a feed gas containing nitrogen oxides having 4 parts NO to one part NO.sub. 2, about one equivalent ammonia, and excess oxygen; conversion improved to 94 percent at 147 degrees Celsius. N.sub. 2O was not detected (detection limit: 0.6 percent N.sub. 2O).
Book Synopsis Method For Selective Catalytic Reduction Of Nitrogen Oxides by :
Download or read book Method For Selective Catalytic Reduction Of Nitrogen Oxides written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for catalytically reducing nitrogen oxide compounds (NO.sub.x, defined as nitric oxide, NO, +nitrogen dioxide, NO.sub. 2) in a gas by a material comprising a base metal consisting essentially of CuO and Mn, and oxides of Mn, on an activated metal hydrous metal oxide support, such as HMO:Si. A promoter, such as tungsten oxide or molybdenum oxide, can be added and has been shown to increase conversion efficiency. This method provides good conversion of NO.sub.x to N.sub. 2, good selectivity, good durability, resistance to SO.sub. 2 aging and low toxicity compared with methods utilizing vanadia-based catalysts.
Book Synopsis Nitrogen oxides (NOx) why and how they are controlled by :
Download or read book Nitrogen oxides (NOx) why and how they are controlled written by and published by DIANE Publishing. This book was released on 1999 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selective Catalytic Reduction of NOx by : Oliver Kröcher
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
Book Synopsis Catalytic Reduction of Nitrogen Dioxide by Hydrogen by : Ali Amirnazmi
Download or read book Catalytic Reduction of Nitrogen Dioxide by Hydrogen written by Ali Amirnazmi and published by . This book was released on 1968 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selective Catalytic Reduction Technology for the Control of Nitrogen Oxide Emissions from Coal-Fired Boilers by : Gene Knight
Download or read book Selective Catalytic Reduction Technology for the Control of Nitrogen Oxide Emissions from Coal-Fired Boilers written by Gene Knight and published by DIANE Publishing. This book was released on 2008-08 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Clean Coal Technology Demo. Program (CCTDP) is an effort to demonstrate a new generation of innovative coal utilization processes in a series of facilities built across the country. These projects are carried out on a commercial scale to prove technical feasibility and provide the info. required for future applications. Projects have demonstrated technical options with the potential to meet the needs of energy markets while satisfying environ. requirements. Part of this program is the demo. of technologies designed to reduce emissions of oxides of nitrogen (NOx) from existing coal-fired utility boilers. This report summarizes the status of selective catalytic reduction (SCR) technology for the control of NOx emissions from high-sulfur, coal-fired boilers. Illus.
Book Synopsis The Catalytic Chemistry of Nitrogen Oxides by : Richard L. Klimisch
Download or read book The Catalytic Chemistry of Nitrogen Oxides written by Richard L. Klimisch and published by Springer. This book was released on 1975-09 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.
Book Synopsis DEVELOPMENT OF IMPROVED CATALYSTS FOR THE SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDES WITH HYDROCARBONS. by :
Download or read book DEVELOPMENT OF IMPROVED CATALYSTS FOR THE SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDES WITH HYDROCARBONS. written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Significant work has been done by the investigators on the cerium oxide-copper oxide based sorbent/catalysts for the combined removal of sulfur and nitrogen oxides from the flue gases of stationary sources. Evaluation of these sorbents as catalysts for the selective reduction of NO[sub x] gave promising results with methane. Since the replacement of ammonia by methane is commercially very attractive, in this project, the effect of promoters on the activity and selectivity of copper oxide/cerium oxide-based catalysts and the reaction mechanism for the SCR with methane was investigated. Unpromoted and promoted catalysts were investigated for their SCR activity with methane in a microreactor setup and also, by the temperature-programmed desorption (TPD) technique. The results from the SCR experiments indicated that manganese is a more effective promoter than the other metals (Rh, Li, K, Na, Zn, and Sn) for the supported copper oxide-ceria catalysts under study. The effectiveness of the promoter increased with the increase in Ce/Cu ratio. Among the catalysts tested, the Cu1Ce3 catalyst promoted with 1 weight% Mn was found to be the best catalyst for the SCR of NO with methane. This catalyst was subjected to long-term testing at the facilities of our industrial partner TDA Research. TDA report indicated that the performance of this catalyst did not deteriorate during 100 hours of operation and the activity and selectivity of the catalyst was not affected by the presence of SO[sub 2]. The conversions obtained by TDA were significantly lower than those obtained at Hampton University due to the transport limitations on the reaction rate in the TDA reactor, in which 1/8th inch pellets were used while the Hampton University reactor contained 250-425-[micro]m catalyst particles. The selected catalyst was also tested at the TDA facilities with high-sulfur heavy oil as the reducing agent. Depending on the heavy oil flow rate, up to 100% NO conversions were obtained. The temperature programmed desorption studies a strong interaction between manganese and cerium. Presence of manganese not only enhanced the reduction rate of NO by methane, but also significantly improved the N[sub 2] selectivity. To increase the activity of the Mn-promoted catalyst, the manganese content of the catalyst need to be optimized and different methods of catalyst preparation and different reactor types need to be investigated to lower the transport limitations in the reactor.
Book Synopsis Reduction of Nitrogen Oxide Emissions by : Umit S. Ozkan
Download or read book Reduction of Nitrogen Oxide Emissions written by Umit S. Ozkan and published by . This book was released on 1995 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes two overview chapters covering both technical and regulatory aspects of nitrogen oxide emissions from stationary sources. Discusses new directions in the field, such as direct composition of NO 2, different reducing agents, new catalytic materials, and two new noncatalytic techniques. Provides a thorough insight into the phenomena involved in existing technologies. Offers a broad spectrum of studies tackling the problem of NO 2 reduction.
Book Synopsis Catalytic Reduction of Nitrogen Dioxide with Carbon Monoxide by : Tomoo Yonebayashi
Download or read book Catalytic Reduction of Nitrogen Dioxide with Carbon Monoxide written by Tomoo Yonebayashi and published by . This book was released on 1966 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalysts for low temperature conversion of nitrogen oxides by : Martin Busch
Download or read book Catalysts for low temperature conversion of nitrogen oxides written by Martin Busch and published by Cuvillier Verlag. This book was released on 2015-06-02 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen oxides are a major threat to human health and largely released by Diesel engines. The present book describes the preparation and characterization of appropriate catalyst systems for low temperature removal (150 - 400°C) and conversion of nitrogen oxides. The presented catalysts include commercially available activated carbon and zeolite supports, infiltrated with iron, copper, manganese and their oxides. The investigated catalysts adsorb and convert nitrogen dioxide almost completely and convert it quickly subsequently into the less toxic nitric oxide and nitrous oxide. Some eventually release nitrogen and oxygen, thus outperforming even the well-known Cu-ZSM-5 catalyst at low temperature. Stickoxide zählen zu den wichtigsten Umweltgiften und werden zu einem großen Anteil durch Dieselmotoren freigesetzt. Dieses Buch beschreibt die Herstellung und Charakterisierung von Katalysatorsysteme für die Niedertemperatur-Umsetzung (150 - 400°C) von Stickoxiden. Zu den vorgestellten Katalysatoren gehören kommerziell verfügbare Aktivkohle und Zeolith-Materialien, welche mit Eisen, Kupfer, Mangan und deren Oxiden infiltriert wurden. Alle untersuchten Katalysatorsysteme absorbieren Stickoxide rasch und setzen diese anschließend fast vollständig in die weit weniger toxischen Gase Stickstoffmonoxid und Distickstoffmonoxid um. Einige der untersuchten Katalysatorsystemen setzen schließlich Sauerstoff und Stickstoff frei und zeigen bei niedrigen Temperaturen sogar eine bessere Performance als der bereits gut bekannte Cu-ZSM-5 Katalysator.
Book Synopsis Kinetics of Catalytic Reduction of Nitrogen Dioxide with Hydrogen by : Ramachandran Krishnamurthy
Download or read book Kinetics of Catalytic Reduction of Nitrogen Dioxide with Hydrogen written by Ramachandran Krishnamurthy and published by . This book was released on 1966 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalytic Reduction of Nitrogen Oxide Emissions with Lower Hydrocarbons for Natural Gas-fired Lean-burn Engines by : Sreshtha Sinha Majumdar
Download or read book Catalytic Reduction of Nitrogen Oxide Emissions with Lower Hydrocarbons for Natural Gas-fired Lean-burn Engines written by Sreshtha Sinha Majumdar and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A hydrothermally stable dual-catalyst aftertreatment system for emission control of nitrogen oxides (NOx) with lower hydrocarbons (CHx) has been developed for natural gas-fired stationary lean-burn engines. The dual-catalyst system consists of a physical mixture of a reduction catalyst, palladium supported on sulfated zirconia (Pd/SZ) and an oxidation catalyst, cobalt oxide supported on ceria, CoOx/CeO2. The multifunctional aftertreatment system oxidizes nitric oxide (NO) to nitrogen dioxide (NO2), reduces NO2 to nitrogen (N2), and oxidizes carbon monoxide (CO) and the unutilized hydrocarbons. For practical applications in environmental catalysis, the catalytically active powder catalyst needs to be wash-coated onto a monolith core. To prevent permanent loss of activity due to physical separation of the wash-coat from the walls of the monolith core, adhesivity enhancing materials (binders) are added to the wash-coat. A novel method of incorporating binder to the active catalyst in situ during sol-gel synthesis is presented in this work. Alumina binder incorporated into Pd/SZ in situ during sol-gel synthesis was chosen for further development of a catalytically active washcoat based on activity tests under simulated engine-exhaust conditions. The alumina binder-incorporated Pd/SZ catalyst slurry controlled at pH 1 and calcined at 700°C demonstrated the most promising NOx reduction and CH4 oxidation activity. Cyclic thermal shock tests demonstrated enhanced adhesive properties of the wash-coat to the walls of the cordierite monolith core. Thus, a catalytically active wash-coat with superior adhesive properties was developed for practical application in a real-world aftertreatment unit.
Book Synopsis System and Method for Selective Catalytic Reduction of Nitrogen Oxides in Combustion Exhaust Gases by :
Download or read book System and Method for Selective Catalytic Reduction of Nitrogen Oxides in Combustion Exhaust Gases written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A multi-stage selective catalytic reduction (SCR) unit (32) provides efficient reduction of NOx and other pollutants from about 50-550.degree. C. in a power plant (19). Hydrogen (24) and ammonia (29) are variably supplied to the SCR unit depending on temperature. An upstream portion (34) of the SCR unit catalyzes NOx+NH.sub. 3 reactions above about 200.degree. C.A downstream portion (36) catalyzes NOx+H.sub. 2 reactions below about 260.degree. C., and catalyzes oxidation of NH.sub. 3, CO, and VOCs with oxygen in the exhaust above about 200.degree. C., efficiently removing NOx and other pollutants over a range of conditions with low slippage of NH.sub. 3. An ammonia synthesis unit (28) may be connected to the SCR unit to provide NH.sub. 3 as needed, avoiding transport and storage of ammonia or urea at the site. A carbonaceous gasification plant (18) on site may supply hydrogen and nitrogen to the ammonia synthesis unit, and hydrogen to the SCR unit.
Book Synopsis New and Future Developments in Catalysis by : Yasushi Sekine
Download or read book New and Future Developments in Catalysis written by Yasushi Sekine and published by Elsevier Inc. Chapters. This book was released on 2013-07-17 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selective Catalytic Reduction of Nitrogen Oxides by Manually Controlled Ammonia Injection by :
Download or read book Selective Catalytic Reduction of Nitrogen Oxides by Manually Controlled Ammonia Injection written by and published by . This book was released on 1983 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nitrogen Oxides Control Technology Fact Book by :
Download or read book Nitrogen Oxides Control Technology Fact Book written by and published by Noyes Publications. This book was released on 1992-01-01 with total page 635 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes international technologies for controlling NOx emissions, primarily from coal combustion. Over 115 control systems are documented with, as available, system descriptions, process applications, pollution reduction capability, system diagram, supplier/manufacturer.
