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Fischer-Tropsch Synthesis For Kerosene-Range Products Using A Multi-Component Catalyst Supported On Coal-Based Activated Carbon, Soumya J. Gujjar
Fischer-Tropsch Synthesis For Kerosene-Range Products Using A Multi-Component Catalyst Supported On Coal-Based Activated Carbon, Soumya J. Gujjar
Graduate Theses, Dissertations, and Problem Reports
The effect of varying the composition of an iron-based catalyst on the performance of Fischer-Tropsch synthesis was studied. The main focus is towards liquids in the range C9 through C15 hydrocarbons, the kerosene/gasoline range hydrocarbons sometimes called the single battlefield fuel. The baseline catalyst was 6%Mo, 16%Fe, 0.8%Cu and 0.9%K supported on anthracite activated-carbon support. Catalysts with 0% Mo and 12% Mo loadings, 0%Fe and 32% Fe loadings, 0% Cu and 1.6%Cu loadings, and 0%K and 1.8%K loadings were investigated. The reaction was carried out at a temperature of 300°C, pressure of 300 psig and syngas (H2/CO ratio = 1) …
Addition Of Zeolite Zsm-5 To An Iron-Based Fischer-Tropsch Catalyst Supported On Activated Carbon: Effect Of Reactor Conditions, Avinashkumar V. Karre
Addition Of Zeolite Zsm-5 To An Iron-Based Fischer-Tropsch Catalyst Supported On Activated Carbon: Effect Of Reactor Conditions, Avinashkumar V. Karre
Graduate Theses, Dissertations, and Problem Reports
An iron-based catalyst containing 6 wt% Mo, 16 wt% Fe, 0.8 wt% Cu, and 0.9 wt% K supported on Norit SX Ultra activated carbon is used as a FTS catalyst. Zeolite ZSM-5 (of medium acidity and Si/Al = 50) is used to check its effect on FT base catalyst to form aromatic compounds and to reduce the size of long-chain hydrocarbons. The influence of ZSM-5 amounts, bed arrangements, and the temperature on the product distribution were investigated.;The performance of ZSM-5 along with the base catalyst was analyzed in two catalyst bed configurations: separate-bed and mixed-bed. Both separate-bed and mixed-bed catalyst …
Functionalization Of Buckled Graphene, Timothy C. Nelson
Functionalization Of Buckled Graphene, Timothy C. Nelson
Graduate Theses, Dissertations, and Problem Reports
Buckled graphene produced by the halogen based etching of 6H-SiC provides a new route for the functionalization of the graphene surface. This surface provides an important new stepping off point in the development of molecular electronics and sensors. While the graphene surface is relatively inert, the fluorinated defect sites inherent in the buckled graphene surface yield an excellent location for chemical reactions such as nucleophilic substitution. This thesis shows the utility of the fluorinated defect sites through the well characterized diazonium reaction.;Buckled graphene films were prepared on silicon carbide substrates using inductively coupled plasma and reactive ion etching, and annealed …
Tailoring Multi-Component Catalysts On Carbon Supports For Fischer-Tropsch Products In The Kerosene Range, Joshua B. Welshans
Tailoring Multi-Component Catalysts On Carbon Supports For Fischer-Tropsch Products In The Kerosene Range, Joshua B. Welshans
Graduate Theses, Dissertations, and Problem Reports
The effects of varying the loading of four promoters on activated carbon supported iron catalysts were investigated. The base case catalyst studied consists of 6 wt% Mo, 16 wt% Fe, 0.8 wt% Cu and 0.9 wt% K. Molybdenum loadings of 0 wt%, 3 wt%, 6 wt% and 12 wt% were studied along with iron loadings of 0 wt%, 8 wt%, 16 wt% and 32%, copper loadings of 0 wt%, 0.4 wt%, 0.8 wt% and 1.6 wt%, and potassium loadings of 0 wt%, 0.45 wt%, 0.9 wt% and 1.8 wt%. The reactor conditions used were 300ºC, 300 psig, and 6 Nl/gcat/h. …
Water Gas Shift Reaction Catalysis Promoted By Selective Sorption Of Carbon Dioxide: Microreactor Experiments, Ramanjaneyulu Katta
Water Gas Shift Reaction Catalysis Promoted By Selective Sorption Of Carbon Dioxide: Microreactor Experiments, Ramanjaneyulu Katta
Graduate Theses, Dissertations, and Problem Reports
Production of hydrogen via the water-gas shift (WGS) reaction normally requires multiple reaction steps followed by CO2 separation. However, in-situ removal of CO2 via the carbonation reaction between CaO and CO2 provides the opportunity to combine WGS and separation reactions into a single unit. Consequently, the need for heat exchangers between catalyst beds as well as the absorption and stripping units for CO2 removal can be eliminated.;In this study, a commercial high-temperature-shift (HTS) catalyst, Fe 2O3/Cr2O3/CuO is used. Calcium oxide (CaO) and calcium oxide incorporated with calcium aluminate (Ca12Al 14O33) are used as sorbents for CO2 capture. The CaO/Ca12Al14O33 sorbent …
Development Of Advanced Coal Devolatilization And Secondary Pyrolysis Kinetics Models For Cfd (And Process Simulation) Codes, Kiran Pandurang Chaudhari
Development Of Advanced Coal Devolatilization And Secondary Pyrolysis Kinetics Models For Cfd (And Process Simulation) Codes, Kiran Pandurang Chaudhari
Graduate Theses, Dissertations, and Problem Reports
Detailed kinetic expressions for the gasification of a wide variety of coals in existing Computational Fluid Dynamics (CFD) codes such as Multiphase Flow with Interphase Exchanges (MFIX) developed by NETL. These expressions describe the fundamental steps taking place in the gasification of coal, namely, coal devolatilization, tar-gas chemistry, soot formation and the heterogeneous and homogeneous gasification reaction along with combustion reactions. For this purpose, the data generated by PC Coal Lab (PCCL) is used to simulate the gasification of various coals in CFD codes. The CFD code of most interest is MFIX, which is used to describe the hydrodynamics, heat …
Electrochemical And Microstructural Analysis Of Solid Oxide Fuel Cell Electrodes, Mingjia Zhi
Electrochemical And Microstructural Analysis Of Solid Oxide Fuel Cell Electrodes, Mingjia Zhi
Graduate Theses, Dissertations, and Problem Reports
Fuel cells offer several advantages over conventional routines of power generation, such as substantially higher conversion efficiency, modular construction, minimal sitting restriction, and much lower production of pollutants. Solid oxide fuel cell (SOFC), in principle, can utilize all kinds of combustion fuels including coal derived syngas (CSG). The U.S. Department of Energy is currently working on coupling coal gasification and SOFC to form Integrated Gasification Fuel Cell (IGFC) systems. Such IGFC systems will enable the clean, efficient and cost-effective use of coal---the nation's most abundant fossil fuel.;However several issues need to be considered before SOFC can be really commercialized. The …
Steady State And Dynamic Modeling Of The Modified Claus Process As Part Of An Igcc Power Plant, Dustin Douglas Jones
Steady State And Dynamic Modeling Of The Modified Claus Process As Part Of An Igcc Power Plant, Dustin Douglas Jones
Graduate Theses, Dissertations, and Problem Reports
The Modified Claus Process is one of the most common methods for sulfur recovery from acid gas streams. An extensive survey of the open literature has been carried out to collect rate expression and experimental data for the reactions of the Claus reaction furnace. For the instances that no rate expression could be found, rate expressions were derived from the available published experimental data. Additionally, data fitting of the rate parameters of key reactions in the Claus furnace was carried out. This resulted in a significantly better agreement of the model with the published industrial data in comparison to the …
Mesostructured Hydrophobic-Oleophobic Silica Films For Sustained Functionality In Tribological Environments, Aaron J. Kessman
Mesostructured Hydrophobic-Oleophobic Silica Films For Sustained Functionality In Tribological Environments, Aaron J. Kessman
Graduate Theses, Dissertations, and Problem Reports
The primary goal of this research was to synthesize water- and oil-repellent coatings that offer sustained functionality and durability. Engineered low surface energy materials generally suffer from a lack of mechanical robustness, which makes them susceptible to damage by abrasive wear. Fluorinated silanes are often combined with alkoxide precursors via sol--gel co-condensation to create coatings with high hardness and good substrate adhesion. However, a common problem with these materials is that the organic moieties that provide low surface energy also become surface segregated and highly concentrated at the solid-air interface. With such a structure, mechanical removal of the top surface …
Ash Removal From Low Rank Coal, Deepankar Virendra Sharma
Ash Removal From Low Rank Coal, Deepankar Virendra Sharma
Graduate Theses, Dissertations, and Problem Reports
The work presented here is concerned with cleaning of low rank coals such as Texas lignite. As a result, Jewett Texas lignite was cleaned from 28% ash by weight to 8.5%. In the first part of the thesis, it is proved that conventional cleaning techniques used for bituminous and sub-bituminous having pyritic impurities does not work for cleaning lignite coal because of different coal chemistry and the presence of clay impurities. Hence after trying conventional processes, there was a need for a new technique capable of removing clay from low rank coals.;Micronized coal, obtained from DevourX LLC, proved to be …