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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 26 for “"Selective catalytic reduction (SCR)"”.
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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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Calibration and performance of a selective catalytic reduction (SCR) bench rig for NOx̳ emissions control
… test 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 …
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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
Aviation NO[subscript x] emissions have an impact on air quality and climate change, where the latter is magnified due to the higher sensitivity of the upper troposphere and lower stratosphere. In the aviation industry, efforts to increase the efficiency of propulsion systems are giving rise to …
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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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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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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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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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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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Development and application of a channel-scale exhaust after-treatment model
… including a diesel oxidation catalyst (DOC), a selective catalytic reduction (SCR) device and a diesel particulate filter (DPF). The model is then applied to study the impact of the configuration of a multi-device after-treatment system. An after-treatment design case study for a heavy-duty …
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NOx Removal by LNT-SCR Dual-layer Catalysts
… have driven the progress of NOx storage and reduction (NSR) technology. NOx is stored in a lean NOx trap (LNT) catalyst during fuel-lean mode and reduced to N2 during fuel-rich mode. First, we investigated the impact of ceria on NSR in an Pt/Ce LNT catalyst. The physisorbed oxygen over the …
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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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Impacts of reducing shipboard NOx̳ and SOx̳ emissions on vessel performance
… explored including two after-treatment systems, selective catalytic reduction (SCR) and exhaust gas scrubbers, and four pre-combustion systems, direct water injection (DWI), fuel-water emulsification, exhaust gas recycle (EGR) and scavenge air moistening (SAM). The published performance impacts …
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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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Nitric oxide reduction by non-thermal plasma and catalysis
… cost and operating difficulties of prevailing selective catalytic reduction (SCR) process are driving R&D efforts towards alternative technologies and modifications to the SCR technology. Non-thermal plasma technique has been found to be one of the most promising technologies for NOx …
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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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Study on mixing, modelling and control of an SCR system
… NOx emissions caused by marine diesel engines. Selective catalytic reduction (SCR) system has been proven to be an effective technology for the removal of NOx emitted from marine diesel engines. In order to comply with stringent International Maritime Organization (IMO) Tier III NOx emission …
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NMR Techniques for Measuring Transport Phenomena in Microporous Materials
… a large pore β-zeolite structure. This thesis describes the development of a solely PFG NMR based technique for measuring the molecular displacements of these species at varying length-scales. This enabled the characterisation of self-diffusion regimes across zeolite beds and within individual …
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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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Applied and Fundamental Studies of LNT-SCR Dual-layer Monolithic Catalysts for Lean NOx Emission Control
… of commercial deNOx technologies, NOx reduction & storage (NSR, also referred to as lean NOx trap (LNT)) and selective catalytic reduction (SCR) technologies. This dissertation conducts applied and fundamental studies of coupled LNT-SCR dual-layer catalysts with the aim of expanding the …
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