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 19 of 19 for “"diesel oxidation"”.
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Influence of fuel sulfur content on emissions from diesel engines equipped with oxidation catalysts
Diesel oxidation catalysts (DOCs) are a viable exhaust aftertreatment alternative for alleviating regulated exhaust emissions of hydrocarbon (HC), carbon monoxide (CO), and particulate matter (PM) from diesel-fueled heavy-duty engines. This study was a part of the Diesel Emissions Control-Sulfur …
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OIL SPILL CLEANUP BY HYDROPHOBIC SILICA AEROGELS AND SPILLED OIL INTERACTION WITH SUSPENDED SEDIMENTS
… 0.2, and 2.3 ± 0.3 g/g for toluene, petrol, and diesel, respectively. Pore sizes decrease after all hydrocarbon desorption, which causes the adsorption capacities of regenerated silica aerogels to decrease. In addition, incomplete desorption of diesel and its oxidation further decrease the …
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After treatment and turbocharger effects on emissions of a diesel engine
… a turbocharger on emissions of a single cylinder diesel engine. The study measured the concentration of CO, CO2, HC, NO, NO2, and NOx. Tests on the engine were performed at different engine loads and engine speeds. The engine power ranged from 0 to 9 HP, and the engine speed ranged from 1500 to …
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Evaluating heavy-duty diesel engine aftertreatment devices with a split exhaust configuration
West Virginia University evaluated diesel oxidation catalysts (DOC) and lean-NOx catalysts as part of the Diesel Emissions Control-Sulfur Effects (DECSE) program. In order to perform thermal aging of the DOC and lean-NOx catalysts simultaneously and economically, each catalyst was sized to …
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The Effect Of Biodiesel Blends On A Multi-Cylinder Engine And The Impact On Aftertreatment
… and clean burning fuel, specifically biodiesel. Biodiesel, or vegetable oil ester as it was originally referred to, has been improving and progressing since the early 1900's. Fortunately, significant advancement in the understanding of raw vegetable oil as a fuel as well as converting it …
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Design and Evaluation of a Marine Scrubber System
… of nitrogen (NOX) emissions regulations for diesel marine engines are resulting in the development of newer engines with inherent NOX emissions reduction technologies. With typical useful service lives over 20 years, older diesel marine engines are producing disproportionate amounts of NOX …
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Coupling of Chemical Kinetics with Computational Fluid Dynamics in a Three-Dimensional Engine Model
… mechanism for n-heptane was selected to simulate diesel oxidation. Each cell in the computational domain is considered as a perfectly-stirred reactor which undergoes adiabatic constant- volume combustion. The model was applied to an ideally-prepared homogeneous- charge compression-ignition …
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The effect of alternative fuels and aftertreatment devices on measured mobile school bus emissions
… University to develop strategies for reducing diesel emissions from mobile sources such as school buses and class 8 trucks. This thesis presents research conducted on reducing emissions from school buses during mobile operating conditions. Four fuel blends and three aftertreatment devices were …
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HC-SCR of NO\(_x\) emissions over Ag-AL\(_2\)O\(_3\) catalysts using diesel fuel as a reductant
… (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. Numerous HC-SCR studies have been conducted (to date) by various authors and research groups …
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Development and application of a channel-scale exhaust after-treatment model
… devices against literature data, 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 …
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Modeling Size-Resolved Particle Number Emissions From Advanced Technology And Alternative Fueled Vehicles In Real-Operating Conditions
… from four transit buses, including two hybrid diesel-electric buses, under a variety of driving conditions and technological/fuel treatments including: diesel oxidation catalysts, diesel particle filters and ultra-low sulfur diesel fuel. A linear mixed model was used to control for multiple …
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Adatom Emission From Nanoparticles: Implications for Ostwald Ripening
… have been used to explore the microstructure of diesel oxidation catalysts (DOCs) in their working state (i.e. under oxidizing conditions). Model catalysts have been used to study the evolution of platinum and palladium nanoparticles. Both a statistical and a microscopic approach have been used …
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Particle matter emission control and related issues for diesel engines
… probably one of the most critical issues of the diesel engine emissions. After years of research, people begin to understand it further, with respect to its impact on the environment and human health, its formation mechanism inside and outside the diesel engine, and most importantly, the methods …
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Trapping Platinum on Ceria: Role of Surface Facets
… are used in the automotive industry for the oxidation of CO, hydrocarbons, and NOx. Dispersed Pt provides active sites for these reactions to occur. During the use of these catalyst, high temperatures will cause Pt to become volatile and sinter, forming large particles which will lead to a …
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Experimental Investigation on Different After-treatment Technologies for the Control of Pollutant Emissions from Automotive Diesel Engines.
High Speed Direct Injection (HSDI) Diesel engines are nowadays spreading in the global market of passenger cars, thanks to undoubted advantages such as higher efficiency (lower fuel consumption and CO2 emissions), drivability, durability and reliability. Increasing concerns regarding the two main …
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Thermal efficiency and emission analysis of advanced thermodynamic strategies in a multi-cylinder diesel engine utilizing valve-train flexibility
… technologies for internal combustion engines. Diesel engines are thermally efficient but require complex aftertreatment systems to reduce tailpipe emissions of unburned hydrocarbons (UHC), particulate matter (PM), and nitrogen oxides (NOx). These challenges require research into advanced …
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The development of ceria-based catalysts for automotive after-treatment applications
… structure and release it again, to facilitate oxidation reactions. Cerium is also one of the most abundant rare earth metals, making it a relatively cost effective material to use in industrial applications. For these reasons, cerium oxide remains to be a material of high interest for the …