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.
Results
Showing 1 to 20 of 160 for “"scr"”.
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Optimizing SCR design for optical detection
r greater than 5.2 [micrometer], and the active mask was recognized as an essential augmentation to all metal contacts in devices fabricated using CMOS technology.
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Poisoning and Sulfation on Vanadia SCR Catalyst
… of titania-supported vanadia commercial SCR catalysts exposed to flue gases from both coal and coal-biomass co-firing boilers were investigated. BET surface area and average pore diameter measurements on both fresh and exposed commercial catalyst samples indicated pore plugging occurred …
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Spatially resolved investigations and modelling of SCR/DPF
… techniques to investigate the behavior of SCR/DPFs. The initial stages of the experimental aspect of the project will make use of the SpaciMS mass spectrometer available in the Chemical Engineering department at QUB. One of the aims of the project is to acquire spatially resolved data …
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NOx Removal by LNT-SCR Dual-layer Catalysts
… consisting of a selective catalytic reduction (SCR) catalyst layer on top of a LNT catalyst. During periodic switching between lean and rich feeds, the LNT layer reduced NOx to N2 and NH3. The SCR layer trapped the latter leading to additional NOx reduction. The dual-layer catalysts exhibited …
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Katalytische Partikeloxidation im Kontext von Harnstoff-SCR und Partikelkonfektionierung
… eine Analyse des Einflusses von Harnstoff-SCR-Technik auf die Partikelemission. Zudem wurde mit der Partikelkonfektionierung durch motorische Maßnahmen eine Möglichkeit zur Verbesserung der katalytischen Partikeloxidation aufgezeigt und untersucht. Untersuchungen mit einem Nfz-Dieselmotor …
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Study on mixing, modelling and control of an SCR system
… 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 regulations, a number of engine …
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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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A capability for continuous topology transient analysis in SCR switching-mode power supplies
A general purpose computer model for the SCR is developed. The model, consisting of both a circuit analog and parameter estimation procedure, is uniformly applicable to popular computer aided design and analysis programs such as SPICE2 and SCEPTRE. The circuit analog is based on the intrinsic three …
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Sensing, Actuation, and Embedded Control for a Custom SCR Nitrogen Oxides Emissions Reduction System
… 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. To improve efficiency we …
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Modeling and Simulation of Coupled LNT – SCR Catalytic System under Anaerobic and Aerobic Operating Conditions
… the influence of the architecture of the LNT-SCR bricks, non-uniform precious metal loading in the LNT bricks, and the cycle time under aerobic and anaerobic operating conditions. Simulations reveal that low temperature reduction is the limiting step in determining the optimal precious metal …
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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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Applied and Fundamental Studies of LNT-SCR Dual-layer Monolithic Catalysts for Lean NOx Emission Control
… 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 operating temperature window of a conventional NSR system at lower cost. This is accomplished by a …
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Heavy-duty diesel vehicle Nox̳ aftertreatment in 2010 : the infrastructure and compliance challenges of urea-SCR
… 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 overcome during the relatively short …
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Investigation of NH3 and no adsorption over Cu/SAPO-34 and Cu/AlOo3 catalysts for NH3–SCR system
… 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 NH_3-NO) to evaluate the adsorption of …
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HC-SCR of NO\(_x\) emissions over Ag-AL\(_2\)O\(_3\) catalysts using diesel fuel as a reductant
Hydrocarbon selective catalytic reduction (HC-SCR) of nitrogen oxides (NO\(_x\)) over silver-alumina (Ag-Al\(_2\)O\(_3\)) catalysts, in diesel exhaust gas, has been investigated and presented in this research thesis. The work involved the use of H\(_2\) to activate diesel-type HC reductants. …
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Alternatives to chlorpyrifos in Virginia type peanut production for control of southern corn rootworm
… howardi Barber (Coleoptera: Chrysomelidae) (SCR), was the major pest of developing peanut previously managed by chlorpyrifos and there are no known alternative insecticides for its control. The SCR larvae can cause economic damage by feeding on developing pods and pegs. Field condition is an …
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