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 24 for “"Fischer-Tropsch (FT)"”.
-
The origin of multiple DSC melting peaks of Fischer-Tropsch hard waxes
… scanning calorimetry (DSC) analyses of the Fischer-Tropsch (FT) hard waxes display multiple melting peaks, the origin of which is unknown. The phenomenon is sometimes referred to in the literature, but no attempt has been made to explain its cause. There are a few known causes of melting …
-
Migration of potassium in an iron-based Fischer-Tropsch/zeolite composite catalyst
The product of the Fischer-Tropsch synthesis is low in aromatics and as a result has relatively poor gasoline quality (with respect to the octane number). Due to the low octane value of gasoline, extensive work-up to improve the octane number is required. Thus the cracking of longer chain …
-
Emissions and in-cylinder combustion characteristics of Fischer-Tropsch and conventional diesel fuels in a modern CI engine
… Derived from natural gas, coal, and even biomass Fischer-Tropsch (FT) fuels are one such alternative. The inherently clean nature of FT diesel coupled with the fact that FT diesel exhibits similar physical properties to those of conventional diesel make FT diesel an ideal candidate as both a …
-
Quantitative policy analysis for aviation biofuel production technologies
… synthesized iso-paraffins (SIP) from sugarcane, Fischer-Tropsch (FT) gasification and synthesis from municipal solid waste (MSW), and micro FT from wood residues. The policies considered include feedstock subsidies, capital grants, output based incentives, and a number of policies intended to …
-
Effect of engine operating parameters and fuel characteristics on diesel engine emissions
To examine the effects of using synthetic Fischer-Tropsch (FT) diesel fuel in a modern compression ignition engine, experiments were conducted on a MY 2002 Cummins 5.9 L diesel engine outfitted with high pressure, common rail fuel injection, a variable geometry turbo charger, cooled EGR and a fully …
-
A stochastic techno-economic comparison of alternative jet fuel production pathways
… biomass; conventional gasification and Fischer-Tropsch (FT) using municipal solid waste; aqueous phase processing (APP) using woody biomass; hydrothermal liquefaction (HTL) using woody biomass; and fast pyrolysis and hydroprocessing (FPH) using corn stover. The results indicate that none …
-
Deuterium Tracer Studies Of The Mechanism Of Cobalt Catalyzed Fischer-Tropsch Synthesis
<p>Since the Fischer-Tropsch (FT) catalytic polymerization reaction has been discovered in 1920s, many kinds of possible mechanisms have been reported. However, there is still debate because there is a lacking of experimental evidence to discriminate the validity of each mechanism. To define the …
-
Water consumption footprint and land requirements of alternative diesel and jet fuel
… footprint of MD from conventional crude oil; Fischer-Tropsch (FT) MD from natural gas and coal; fermentation and advanced fermentation (AF) MD from biomass; and hydroprocessed esters and fatty acids (HEFA) MD and biodiesel from oilseed crops, in the US. FT and rainfed biomass-derived MD have …
-
[Ca₂₄Al₂₈O₆₄]⁴⁺(e⁻)₄ electride as a novel support system for iron-based Fischer-Tropsch synthesis
Iron-based Fischer-Tropsch (FT) technology is well established in the industrial production of hydrocarbon resources. The use of a stable inorganic electride as a support system, with potential promoter effects which could replace commonly used alkali metals, may have the potential to open a new …
-
Environmental and economic tradeoffs of feedstock usage for liquid fuels and power production
… conventional crude oil; jet fuel production from Fischer-Tropsch (FT) processes using natural gas, coal and/or switchgrass; HEFA (hydroprocessed esters and fatty acids) jet fuel from soybean, palm, rapeseed and jatropha; and advanced fermentation jet (AF-J) fuel from sugarcane, corn grain and …
-
Model systems for the investigation of metal-support interactions in cobalt based Fischer-Tropsch
… plays a pivotal role in the optimization of the Fischer Tropsch (FT) synthesis. Cobalt (Co)-based catalysts have been widely used in low temperature Fischer Tropsch synthesis for the production of longer chain olefins [1]. The interaction between the support and the active metal, Co, has been …
-
Environmental and economic assessment of transportation fuels from municipal solid waste
… pathways: conventional gasification and Fischer-Tropsch (FT MD), plasma gasification and Fischer-Tropsch (Plasma FT MD) and, conventional gasification, catalytic alcohol synthesis and alcohol-to-jet upgrading (ATJ MD). Expanded system boundaries are used to capture the change in existing …
-
Magnetic Resonance Studies of the Diffusion Dynamics of Molecular Systems Relevant to Fischer-Tropsch Catalysis
The Fischer-Tropsch (FT) reaction is a heterogeneous catalytic reaction that produces synthetic linear hydrocarbon fuels from syngas. Recently there has been renewed academic and industrial interest in the reaction due to its potential to be used in the production of carbon-neutral fuels. The …
-
Fundamental behaviour and micronisation of Fischer-Tropsch waxes via supercritical CO2 PGSS processing
… literature exists on the PGSS micronisation of Fischer-Tropsch (FT) waxes via sc-CO₂. The primary aim of this project was to assess the viability of sc-CO₂ PGSS micronisation of FT waxes, and to obtain an in-depth understanding of the interdependencies between PGSS processing conditions …
-
Ideal hydrocracking catalysts for the conversion of FT wax to diesel
The Fischer-Tropsch wax synthesis process and the subsequent upgrade of the wax to useful distillate fuels by mild hydrocracking is a well-known, economically viable method of producing liquid fuels, in particular diesel fuel. This project seeks to develop an ideal hydrocracking catalyst (i.e. a …
-
Nuclear tanker producing liquid fuels from air and water
… supplying fuel to deployed naval ships and aircraft. Based upon historical data provided by the US Navy (USN), the tanker ship must supply 6,400 BBL/Day of fuel (JP-5) to accommodate the highest anticipated demand of a carrier strike group (CSG). Previous investigation suggested implementing …
-
NMR Studies of Emulsions in Porous Media and Applications to Fischer-Tropsch Synthesis
… of conventional fossil fuels are dwindling, Fischer-Tropsch (FT) is a promising and greener method to convert natural gas into liquid fuels. However, it is highly complex and remains thus far poorly understood. The work presented in this thesis employs nuclear magnetic resonance (NMR) and …
-
Energy Systems Analysis for a Solar Economy
… biomass thermochemical routes of gasification/Fischer-Tropsch (FT) synthesis and fast-hydropyrolysis/hydrodeoxygenation. For &eta<sub>carbon =70-95%, the synergistic gain of the optimal integrated process is evidenced from the 28-156% lower solar energy consumption compared to augmented …
-
Effect of ammonia co-feeding on oxygenates over K-Mo2C in the Fischer-Tropsch synthesis
The Fischer-Tropsch (FT) process, producing long chained waxes and transportation fuels, is competing with fuels derived from crude oils and its profitability is therefore dependent on the global oil price. However, increasing the value of synthesized products could render the profitability of the …
-
Novel empowered supports for iron-based Fischer-Tropsch in a power-to-liquids process
Fischer-Tropsch (FT) synthesis is a process that converts carbon monoxide and hydrogen into liquid hydrocarbons 1 . In the past, FT synthesis has been used to produce gasoline and diesel from coal and natural gas. However, with increasing demand for renewable and sustainable energy sources, there …
Page 1 of 2