Browsing NTNU Open by Author "Rytter, Erling"
Now showing items 1-20 of 26
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A gas to liquid Fischer-Tropsch process integrated with Solar Thermal Water Split - Techno-Economical Feasibility
Emhjellen, Morten Thomas (Master thesis, 2016)Hydrocarbons are used in many products, and are the primary energy source for current civilizations, mainly as combustible fuel. There is a rapidly growing demand for environmentally friendly and renewable energy sources ... -
Boosting carbon efficiency of the biomass to liquid process with hydrogen from power: The effect of H2/CO ratio to the Fischer-Tropsch reactors on the production and power consumption
Ostadi, Mohammad; Rytter, Erling; Hillestad, Magne (Journal article; Peer reviewed, 2019)Carbon efficiency of a biomass to liquid process can be increased from ca. 30 to more than 90% by adding hydrogen generated from renewable power. The main reason is that in order to increase the H2/CO ratio after gasification ... -
Capturing metal-support interactions in situ during the reduction of a Re promoted Co/γ-Al2O3 catalyst
Tsakoumis, Nikolaos; Johnsen, Rune E.; van Beek, Wouter; Rønning, Magnus; Rytter, Erling; Holmen, Anders (Journal article; Peer reviewed, 2016)The reduction of a Re promoted Co/γ-Al2O3 catalyst was monitored in situ by synchrotron X-ray powder diffraction (XRPD) under H2 environment. Whole powder pattern analysis revealed a non-linear expansion of the unit cell ... -
Carbon nanotubes (CNT) for enhanced oil production from shales
Hussain, Aqeel (Master thesis, 2014)The shale gas production has brought a revolution in US energy market and the global prospect of shale gas production is on continuous increase. The advancements in hydraulic fracturing made it possible to extract very low ... -
Correlation of Catalyst Morphology with Attrition Resistance and Catalytic Activity of Fischer-Tropsch Catalysts
Fiske, Thomas Haukli (Master thesis, 2013)Three alumina based support materials for the Fischer-Tropsch synthesis (FTS) catalyst has been prepared and investigated. The three support materials were prepared in order to obtain different mechanical strengths, ... -
Evaluation of Reoxidation Thresholds for γ-Al2O3-Supported Cobalt Catalysts under Fischer - Tropsch Synthesis Conditions
Tsakoumis, Nikolaos; Walmsley, John; Rønning, Magnus; van Beek, Wouter; Rytter, Erling; Holmen, Anders (Journal article; Peer reviewed, 2017)Size-dependent phenomena at the nanoscale influence many applications, notably in the science of heterogeneous catalysis. In cobalt-based Fischer–Tropsch synthesis (FTS), the size of Co nanoparticles (NPs) dictates to a ... -
Fischer-Tropsch Catalysts for Jet Fuel Production
Casalegno Garduño, Mario Ernesto (Master thesis, 2014)Diverse β-zeolite and β-zeolite/Fischer Tropsch catalysts were prepared under hydrothermal conditions to obtain a tailored jet fuel catalyst. The Fischer Tropsch catalyst that was employed is cobalt-based and it was provided ... -
Fischer-Tropsch reaction kinetics: Mathematical modeling and model fitting
Runningen, Anders (Master thesis, 2019)I denne masteroppgaven er en matematisk modell for Fischer-Tropsch syntesen foreslått. Modellen inkluderer effektene av vann på reaksjonskinetikk, selektiviteter, og deaktivering av katalysator. Modellen er basert på ... -
Fischer-Tropsch synthesis over an alumina-supported cobalt catalyst in a fixed bed reactor – Effect of process parameters
Gavrilovic, Ljubisa; Jørgensen, Erik Andreas; Pandey, Umesh; Putta, Koteswara Rao; Rout, Kumar Ranjan; Rytter, Erling; Hillestad, Magne; Blekkan, Edd Anders (Peer reviewed; Journal article, 2020)Fischer-Tropsch synthesis has been investigated over a commercial type cobalt-based catalyst (20 %Co/0.5 %Re/γ-Al2O3) by varying the H2/CO ratio (2.55–1.12), CO conversion (15–75 %), reaction temperature (210 °C, 230 °C), ... -
Fischer–Tropsch Synthesis at High Conversions on Al2O3-Supported Co Catalysts with Different H2/CO Levels
Lillebø, Andreas Helland; Rytter, Erling; Blekkan, Edd Anders; Holmen, Anders (Journal article; Peer reviewed, 2017)Fischer-Tropsch experiments with different H2/CO ratios at high CO conversions have been carried out over an alumina-supported 20wt%Co-0.5wt%Re catalyst in a stainless steel fixed-bed reactor at 210 oC and 20 bar and with ... -
Green River Kerogen Product Distribution Analysis: The Influence of Pyrolysis and Catalytic Reactions with Hydrogen-Donor Solvent
Meyer, Marthe (Master thesis, 2016)The increase in global energy consumption of petroleum, which is estimated to even surge to ca. 37% by 2035, requires substitutes from other unconventional sources of oil and gas. Utilization of oil shale by technology and ... -
Hydrophobic Catalyst Support Surfaces by Silylation of γ-Alumina for Co/Re Fischer-Tropsch Synthesis
Rytter, Erling; Salman, Ata ul Rauf; Tsakoumis, Nikolaos; Myrstad, Rune; Yang, Jia; Lögdberg, Sara; Holmen, Anders; Rønning, Magnus (Journal article; Peer reviewed, 2018)Eight different silanes with chloro or methoxy active ligands have been examined to modify the surface of a standard γ-alumina support to investigate the effect of surface acidity and hydrophobicity in Fischer-Tropsch ... -
Improving carbon efficiency and profitability of the biomass to liquid process with hydrogen from renewable power
Hillestad, Magne; Ostadi, Mohammad; del Alamo Serrano, Gonzalo; Rytter, Erling; Austbø, Bjørn; Pharoah, Jon; Burheim, Odne Stokke (Journal article; Peer reviewed, 2018)A process where power and biomass are converted to Fischer-Tropsch liquid fuels (PBtL) is compared to a conventional Biomass-to-Liquid (BtL) process concept. Based on detailed process models, it is demonstrated that the ... -
Integration of Renewable Production of Hydrogen in Current Biomass-to-Liquid Biofuels Production Systems
Samuelsen, Eirik (Master thesis, 2017)This report focuses on the production of hydrocarbons in a biomass to liquid (BtL) process with integration of hydrogen production. The hydrogen will be produced from high temperature electrolysis of steam utilizing excess ... -
Multifunctional proppants for enhanced oil production from shales
Hemminghytt, Thomas Støme (Master thesis, 2015)The purpose of the work, which has been done during this thesis, has been to give a better basis for future research on the subject. The subject is functionalizing proppants and testing of these functions. The experimental ... -
New and Innovative Conceptual Designs of Gas-to-Liquid Processes
Ostadi, Mohammad (Doctoral theses at NTNU;2017:205, Doctoral thesis, 2017)The research is about a chemical process, which turns natural gas into liquid fuel through chemical reactions, and it is called Gas-to-Liquid (GTL) process. The produced liquid fuel is a replacement for liquid fuel derived ... -
Perspectives on the Effect of Water in Cobalt Fischer-Tropsch Synthesis
Holmen, Anders; Rytter, Erling (Journal article; Peer reviewed, 2017)Water is an inherent component in Fischer–Tropsch synthesis on Co catalysts, and the effect of water is discussed with an emphasis on alumina and aluminates as support materials. Water may affect the selectivity, activity, ... -
Significance of C3 Olefin to Paraffin Ratio in Cobalt Fischer–Tropsch Synthesis
Rytter, Erling; Yang, Jia; Borg, Øyvind; Holmen, Anders (Peer reviewed; Journal article, 2020)The ratio between propene and propane (C3 o/p) during Fischer–Tropsch synthesis (FTS) has been analyzed based on both literature reports and experiments for five catalysts. The latter comprise four cobalt catalysts on ... -
Solar Thermal Hydrogen Production: A Dynamic Reactor Model for the Hercynite Cycle
Westbye, Alexander (Master thesis, 2016)The focal point of this thesis is the production of hydrogen. Hydrogen is classified as a secondary energy source and must, analogous to electricity, be efficiently produced from some primary energy source. This primary energy ... -
SolarThermal Splitting of Water to Hydrogen with Co-doped-hercynite - Testing and Characterisation / Heat integration
Erevik, Tor Olav Høva (Master thesis, 2016)By using concentrated solar energy, it is possible to split water to hydrogen and oxygen, or eventually CO2 to CO and oxygen, by using redox materials at temperatures between 1200 1500 °C. One of the best redox materials ...