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 20 of 23 for “"Carbon Conversion"”.
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Traversing catalytic contexts for interrogation and design of carbon conversion electrocatalysts
… chemistry to perform electrochemically is CO₂ conversion. Converting CO₂ into value-added chemicals could be one strategy for abating atmospheric carbon, and electrochemistry is well-suited to provide the driving force required for CO₂ conversion reactions that tend to be highly endergonic. …
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Kinetic Modeling of a Transport Coal Gasifier
… easier to gasify than coals with a higher fixed carbon content. The results show that at least 20 percent of the Freedom lignite is gasified at 815°C, 135 psig, six percent steam concentration, and a 45 second solids residence time of a single recycle pass in the transport reactor.</p> …
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Fluidised bed gasification of high-ash South African coals : an experimental and modelling study
… between 880 °C and 980 °C. The maximum fixed carbon conversion achievable in the pilot plant is, however, limited to ± 88% due to the low reactivity of the coals tested and to thermal fragmentation and attrition of the coal in the gasifier. It was found that oxygen enrichment of the …
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CO2 Derived Carbon Capture Using Microalgae in a PhotoBioCREC Unit
Microalgae has the potential to contribute to carbon dioxide capture, resulting in the production of alternative fuels and valuable chemical products. To accomplish this, high-efficiency photobioreactors must be conceptualized, designed, and established, in order to achieve high inorganic carbon …
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THE APPLICATION OF OXIDATIVE HYDROTHERMAL DISSOLUTION (OHD) TO ORGANIC-RICH SHALES
… affects oil shale kerogen, a series of partial conversion experiments were conducted on an Alpha Torbanite sample at varied temperatures, reaction times, and oxidant inputs. Using a fixed-bed type reactor, over 90% carbon conversion was achieved in just 10-12 minutes under relatively mild …
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Energy Systems Analysis for a Solar Economy
… with the constrained availability of renewable carbon and land resources. This study uses systems analysis tools to identify carbon and energy efficient transformations of solar energy for different purposes, including transportation fuels and grid-scale energy storage. These efforts have been …
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Literature Survey of Wet-Waste and Hydrothermal Carbonization System: A Comparative Evaluation
… thesis describes the process of Hydrothermal carbonization and a comparative assessment on recent work done on the process using different feedstocks such as Raw Apple (RA), Apple chip pomace (ACP), apple juice pomace (AJP), grape pomace (GP), macadamia nut-shell (MNS), Sewage Sludge (SS), …
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Multiscale CFD simulations of entrained flow gasification
… metrics of gasifier performance, like fuel conversion and syngas composition, we need to first gain confidence in the sub-models of the various physical and chemical processes in the gasifier. Moreover, in a multiphysics problem like gasification modeling, one needs to balance the effort …
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Integration of anaerobic digestion with bio-electrochemical technologies in cascading circular bioeconomy systems producing biofuel and chemicals
… provides a pathway for effective in-situ bioconversion of carbon dioxide to biomethane and improved substrate utilisation. The overall carbon utilisation of biomass conversion in AD and MEC-AD can be limited by the presence of carbon dioxide (CO2; approximately 30–45%) in the off-gas. This …
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Numerical Modelling of Sooting Laminar Diffusion Flames at Elevated Pressures and Microgravity
… a similar power-law dependence of the maximum carbon conversion on pressure which weakened as pressure was increased. This dependence decayed at a faster rate in zero gravity when pressure was increased beyond 1–10 atm.
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An Improved Biosolid Gasifier Model
… heating value of the syngas, gas flow rate, and carbon conversion. The model was validated by comparing the simulation temperature profile data with the measured temperature profile data. An overall heat loss coefficient was calculated for the gasification unit to provide a more accurate energy …
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Optimising the Wider Energy Metabolome of Microbes Using Targeted UHPLC-MS/MS Present in Bio-Electrochemical Systems for Carbon Dioxide Conversion to Platform Chemicals
… that govern redox balance, energy charge, and carbon flux in industrial microorganisms. The method was designed to improve and optimise quenching, extraction, and analysis of yeast and bacterial cultures, enabling robust measurement of NAD+, NADH, NADP+, NADPH, FAD, AMP, ADP, and ATP in a …
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Multi-scale chemistry modeling of the thermochemical conversion of biomass in a fluidized bed gasifier
The thermochemical conversion of biomass to fuels via syn-gas offers a promising approach to producing fungible substitutes for petroleum derived fuels and chemicals. In order for these fuels to be adopted, they must be produced in a cost-competitive way. Unfortunately, there exist a number of …
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Co-gasification of coal and biomass
Gasification is thermo-chemical conversion technology in which complex organic polymers present in feedstock react with limited oxygen supplied by steam or air. The gasification reaction produces CO2 (Carbon-dioxide), H2 (Hydrogen), CO (Carbon-monoxide), CH4 (Methane) and other lower hydrocarbons. …
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Mathematical Modeling of Ultra-Superheated Steam Gasification
… combusting feedstocks at the price of decreasing carbon conversion ratio, or using costly heating apparatus. Therefore, a distributed gasifier with an Ultra-Superheated-Steam (USS) generator was invented, satisfying the heat requirement and avoiding carbon combustion in steam gasification. This …
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Investigation of high-temperature and high-pressure steam gasification kinetics of a coal-derived char surrogate
… interest through its ability to convert solid, carbonaceous feedstocks (i.e., coal or biomass) into energy, fuels, and chemicals. Additionally, gasification is considered a ``clean'' technology as harmful emissions and greenhouse gases are readily sequestered. The gasification of a carbonaceous …
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Catalystic Pyrolysis for the Production of Stable Phenol Rich Bio-Oil from Wood Biomass
… in reducing our load on the conventional hydrocarbon use and be shared with renewable sources such as forest and agricultural wastes. In Saskatchewan, there is abundant availability of wood waste from the timber industry; hence wood can be used as biomass raw material for the production of …
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Carbon Dioxide Capture Conversion via Calgary Framework CALF-20: Catalytic Process design and Optimization
… developed in Dr. Shimzu’s lab in three catalytic conversion processes. Each process was implemented in this project as a separate objective. Chapter 3 included developing an integrated device at Dr. Kibria’s lab, wherein MOF-based porous materials served as CO? concentrators, and subsequently, a …
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Design and Engineering of Carbon Fixing Material Systems
… grow, repair, and self-reinforce using carbon dioxide (CO₂) and ambient light as mass and energy sources respectively. In this thesis, we seek to study and develop mechanisms of growth and self-repair similar to living plant systems to create what we deem artificial carbon fixing …
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Catalytic Production of Furfural by the Subcritical Hydrothermal Gasification of Flax Straw
… of renewable resource that is considered to be carbon neutral when used in producing fuels and chemicals. Flax straw is an example of biomass that accumulates in Canada in high amounts. It is difficult to dispose of because it does not decompose easily as a result of its tough fibrous nature. …
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