Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 67 for “"catalytic reduction"”.
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Heterogeneous Catalytic Reduction of Perchlorate in Water
Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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Selective catalytic reduction: testing, numeric modeling, and control strategies
Selective Catalytic Reduction (SCR) catalysts respond slowly to transient inputs, which is troublesome when designing ammonia feed controllers. An experimental SCR test apparatus was installed on a Cooper Bessemer GMV-4 natural gas engine. Transient data was taken of commercially available SCR …
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Physics based modeling of urea selective catalytic reduction systems
… control-oriented modeling of urea-selective catalytic reduction (SCR) after-treatment systems used for reducing NO, emission in diesel vehicles. Starting from first-principles, appropriate simplifications are made in the underlying energy and species equations to yield simple governing …
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The catalytic reduction of nitric oxide over copper doped aluminosilicates
… cleaning facility and is limited to the study of catalytic NOx reduction over aluminosilicates. A copper ion-exchanged zeolite (Cu-ZSM-5) and copper oxide were studied as catalysts for the Selective Catalytic Reduction (SCR) of nitric oxide in the temperature range 250-530⁰ C. Ammonia was employed …
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Catalytic reduction of nitric oxide by solid carbonaceous material under lean condition
… O_2, appears to be a stable intermediate in the reduction of NO. With experimental parameters chosen to simulate Diesel exhaust conditions, Cu-GAC is much more effective than GAC mixed with Cu-ZSM-5, converting six times more NO_x to N_2 at 500 C at the representative gas hourly space velocity of …
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Adaptive Model Predictive Control of Diesel Engine Selective Catalytic Reduction (Scr) Systems
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2009.
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The catalytic reduction of emissions from a natural gas fueled spark ignited engine
… fueled by natural gas. One possible emissions reduction strategy is the catalytic aftertreatment of the engine-out exhaust for stoichiometric operation. The focus of this work was to develop a catalytic converter test facility, to evaluate the operational and emissions characteristics of a …
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Model-based fault detection and diagnosis of selective catalytic reduction systems for diesel engines
… call for the adaptation of the Selective Catalytic Reduction (SCR) system by many diesel manufacturers. In order to show the EPA the latest emission compliance, the sensors are required to be installed at upstream and downstream of the SCR. As a result, the reduction efficiency is also …
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Continued investigations of the catalytic reduction of N₂ to NH₃ by molybdenum triamidoamine complexes
… and the introduction of dihydrogen during the catalytic reduction of dinitrogen to ammonia with [HIPTN 3N]Mo complexes was completed. During a catalytic reaction, the use of different solvents including fluorobenzene, THF, and toluene did not produce catalytic turnover of ammonia from …
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Catalytic Reduction of NO and N2O with Hydrogen in Water by Polymer-Protected Palladium Nanoparticles
… 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 …
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Calibration and performance of a selective catalytic reduction (SCR) bench rig for NOx̳ emissions control
… designed and built to easily test SCR (Selective Catalytic Reduction) technology. Equipped with three 6 kW heaters, connections for liquid N2 and an assortment of test gases, and a connection with an MKS NOx Analyzer, the rig allows for a vast range of SCR test conditions, and can easily be …
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A Window into Selective Catalytic Reduction: a RAIRS Study of NO and NH3 on Cu{311}
… of the underlying mechanism of the selective catalytic reduction (SCR) of NO using NH3 in current diesel engines. The dosing of NO onto the Cu{311} surface at 100 K leads to the initial adsorption of intact NO. After an exposure threshold is reached, individual NO molecules react with another …
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Synthesis and characterization of micro- and mesoporous materials for low temperature selective catalytic reduction of nitrogen oxides
In summary, it has been shown during this study that bimetallic Fe and Mn containing catalysts can be prepared by wet impregnation and not by ion exchange because of the competition between two different metals at different oxidation number. Only a single metallic phase catalyst could be prepared …
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Spectroscopic and Kinetic Study of Copper-Exchanged Zeolites for the Selective Catalytic Reduction of NOx with Ammonia
… small-pore zeolites for use in the selective catalytic reduction (SCR) of NO<sub>x</sub> with ammonia NH<sub>3</sub> for automotive deNO<sub>x</sub> applications has been a great stride in achieving emission standard goals. Copper-exchanged SSZ-13 (Cu-SSZ-13), the small-pore zeolite in this …
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Adaptive PI control of NOx̳ emissions in a Urea Selective Catalytic Reduction System using system identification models
The Urea SCR System has shown great potential for implementation on diesel vehicles wanting to meet the upcoming emission regulations by the EPA. The objective of this thesis is to develop an adaptive controller that is capable of uniformly maintaining a high efficiency and a low ammonia slip in …
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An Experimental Investigation into NOx Control of a Gas Turbine Combustor and Augmentor Tube Incorporating a Catalytic Reduction System
… the feasibility of NO x emission control using catalytic reduction techniques in the jet engine test cell environment. A modified T-63 gas turbine combustor and an augmentor tube, 21 feet in length and containing a perlite catalyst, were used as a gas generator and catalytic reduction system. …
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