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 37 for “"Selective Catalytic Reduction"”.
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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
… addresses 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 …
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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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Model-based fault detection and diagnosis of selective catalytic reduction systems for diesel engines
… regulations 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 …
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Calibration and performance of a selective catalytic reduction (SCR) bench rig for NOx̳ emissions control
… rig was 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 …
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A Window into Selective Catalytic Reduction: a RAIRS Study of NO and NH3 on Cu{311}
… understanding 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 …
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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 …
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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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Exploring the Mechanistic Landscape of Nitric Oxide Oxidation and Ammonia Selective Catalytic Reduction of Nitric Oxide on Cu-Zeolites via Kinetic and Spectroscopic Characterization
… operation and design the next generation of catalytic formulations to meet future requirements. Small-pore Cu- and Fe-exchanged SSZ-13 catalysts with chabazite (CHA) topology are able to sustain high catalytic rates for selective catalytic reduction (SCR) even after exposure to harsh …
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Post-combustion emissions control for aero-gas turbine engines
… thrust. This thesis proposes and assesses selective catalytic reduction (SCR), which is a post-combustion emissions control method used in ground-based sources such as power generation and heavy-duty diesel engines, for use in aero-gas turbines.
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Sensing, Actuation, and Embedded Control for a Custom SCR Nitrogen Oxides Emissions Reduction System
… nitrogen oxides and particulate matter. Selective Catalytic Reduction (SCR) systems have long been used to reduce diesel emissions from medium to heavy-duty diesel engines. Primary focus of this research effort is the implementation and improvement of a SCR system on light diesel engines. …
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An Approach to Automotive Electrification and Testing
… of the systems include for the EcoCAR 2 are the Selective Catalytic Reduction system, high voltage cabling optimization, CAN bus network, and charging system. For EcoCAR 3, the design and build of a high voltage distribution box, for bench testing, will be discussed. Simulations of the high …
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Theoretical Study of the Electronic Structure and Reactions Involving Oxygen-Bridged Cu-Pairs in Zeolite Catalysts for Lean Nitric Oxide Abatement
… isolated metal ions and pairs of metal ions in catalytic chemistry is still unclear. In this investigation, two complementary approaches were used to address this problem: quantum-mechanics-based calculations to determine the structure and stability of paired Cu ions, and statistical modeling to …
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Investigation of NH3 and no adsorption over Cu/SAPO-34 and Cu/AlOo3 catalysts for NH3–SCR system
… wetness impregnation method for ammonia selective catalytic reduction (NH_3-SCR). These NH_3-SCR catalysts are characterized by pulse chemisorption, temperature-programmed reduction (TPR), and temperature-programmed desorption (TPD) with three different conditions (NH_3, NO, combined …
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The Effect Of Biodiesel Blends On A Multi-Cylinder Engine And The Impact On Aftertreatment
… catalyst, diesel particulate filter and a selective catalytic reduction catalyst and the effect that biodiesel blends has on their performance and effectiveness.</p>
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Reaction and Transport Coupling in Multi-Functional Catalysts for Selective Oxidation of Ammonia to Nitrogen
A multi-functional catalytic reactor (popularly known as “Ammonia Slip Catalyst (ASC)” or “AMOx”) comprising Pt/Al2O3 and Cu or Fe-exchanged zeolite is utilized for selective oxidization of NH3 to N2 in the diesel engine emission control system. Pt catalyzes the oxidation of NH3 to four products …
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Process modeling and analysis of CO₂ purification for oxy-coal combustion
… like traditional flue gas desulfurization (FGD), selective catalytic reduction (SCR), catalytic O₂ consumption, packed bed adsorption and low temperature flash separation have been proposed. In this thesis, we develop a novel CO2 purification process model for oxy combustion systems that utilizes …
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Heavy-duty diesel vehicle Nox̳ aftertreatment in 2010 : the infrastructure and compliance challenges of urea-SCR
… in 2010, has stimulated debate over whether urea selective catalytic reduction (urea-SCR) or lean NOx traps (LNT) are the better NOx aftertreatment approach for meeting this new standard. And, if urea-SCR is indeed the preferred option, how can its compliance and infrastructure challenges be …
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Structural Design and Analysis for a DeNOₓ Catalyst in Aviation
… controlling NOₓ emissions in other industries is selective catalytic reduction (SCR). As a post-combustion emissions control (PCEC) exhaust treatment, the technology works by introducing a nitrogen-rich reductant into the exhaust stream, then passing the flow through a catalyst. This device …
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