• Model Predictive Control for a De-oiling Hydrocyclone: A Theoretical and Experimental Study 

  Gaudernack, Amund Egeland (Master thesis, 2021)

  Utslipp av produsert vann er en voksende bekymring på grunn av den negative miljøpåvirkningen. En potensiell løsning er de-oiling hydrosykloner, som er den mest brukte teknologien for å rense produsert vann. Compact Separator ...

• Properties of Dense Barite Sediments from Water-Based Drilling Fluids Oscillatory Viscosity Measurements of Wet Barite Powder 

  Werner, Benjamin; Pedrosa, Camilo; Skorpa, Ragnhild; Ytrehus, Jan David; Vrålstad, Torbjørn; Saasen, Arild (Journal article; Peer reviewed, 2021)

• Modelling Solvent Degradation in Amine-based Post-combustion Carbon Capture 

  Lille-Mæhlum, Øyvind Vilfred Haugberg (Master thesis, 2021)

  Aminbasert karbonfangst er en teknologi som kan redusere de stadig større menneskeligskapte CO2-utslippene. Det er likevel to problemer med denne teknologien. For det første vil løsningsmiddelet som brukes for å reagere ...

• Unraveling Enhanced Activity, Selectivity, and Coke Resistance of Pt–Ni Bimetallic Clusters in Dry Reforming 

  Niu, Juntian; Wang, Yalan; Liland, Shirley Elisabeth Sjø; Regli, Samuel K.; Yang, Jia; Rout, Kumar Ranjan; Luo, Jun; Rønning, Magnus; Ran, Jingyu; Chen, De (Journal article; Peer reviewed, 2021)

  By introducing Pt atoms into the surface of reduced hydrotalcite (HT)-derived nickel (Ni/HT) catalysts by redox reaction, we synthesized an enhanced active and stable Ni-based catalyst for methane dry reforming reaction. ...

• Comparison of Fresh and Spent Pd/Al2O3 Catalysts for Low Temperature Selective Hydrogenation 

  Værnes, Erlend Skjørstad (Master thesis, 2021)

  Karakterisering av to kommersielle Pd/γ-Al2O3 katalysatorer med ulik dispersjon var utført før og etter aktivitetstester. Aktivitetstestene innebar selektiv hydrogenering av et nitroarenderivat for å danne et korresponderende ...

• Solvent Regeneration by Thermopervaporation in Subsea Natural Gas Dehydration: An Experimental and Simulation Study 

  Ahmadi, Mahdi; Ansaloni, Luca; Hillestad, Magne; Deng, Liyuan (Peer reviewed; Journal article, 2021)

  An in-house designed membrane process suitable for subsea natural gas dehydration was studied. The use of a membrane absorber together with a thermopervaporation (TPV) unit for solvent regeneration in a closed loop enables ...

• Tandem hydrodeoxygenation catalyst system for hydrocarbons production from simulated bio-oil: Effect of C-C coupling catalysts 

  Yeboah, Isaac; Li, Yahao; Rajendran, Kishore; Rout, Kumar Ranjan; Chen, De (Peer reviewed; Journal article, 2021)

  Research in the sustainable conversion of biomass to fuels and chemicals is a necessity for the reduction of the carbon footprint in transport energy. Herein, we demonstrate an efficient tandem catalyst to selectively ...

• Zirconia-Supported Catalysts for Oxidation of NO to NO2 in the Production of Nitric Acid 

  Vold, Sunniva (Master thesis, 2021)

  Salpetersyre er et viktig kjemisk produkt som hovedsakelig blir brukt til å produsere kunstgjødsel av nitrater. Den industrielle prosessen for framstilling av salpetersyre foregår i tre hovedtrinn, kald Ostwaldprosessen. ...

• Study of Particle Sizes and Morphologies of Silica Coated Iron Oxide Nanoparticles Synthesized via a Semi-Batch Process 

  Nissen-Sollie, Hanne T. (Master thesis, 2021)

  Jernoksid nanopartikler har vekket mye oppmerksomhet den siste tiden pa ̊ grunn av dere fremragende egenskaper som superparamagnetisme og høyt forhold mellom overflateareal og volum. Partiklene er anvendt i forskjellige ...

• The Impact of Operating Parameters on the Gas-Phase Sulfur Concentration after High Temperature Sulfur Sorption on a Supported Mo-Mn Sorbent 

  Ma, Jianyu; Mahmoodinia, Mehdi; Rout, Kumar Ranjan; Blekkan, Edd Anders (Journal article; Peer reviewed, 2021)

  The impact of operating parameters on H2S capture from a syngas mixture by a Mo-promoted Mn-based high-temperature sorbent was investigated. The parameters investigated included temperature, space velocity, H2S concentration ...

• Improved lifetime and stability of copper species in hierarchical, copper-incorporated CuSAPO-34 verified by catalytic model reactions 

  Sørli, Guro; Azim, Muhammad Mohsin; Rønning, Magnus; Mathisen, Karina (Peer reviewed; Journal article, 2021)

  The first successful synthesis of hierarchical CuSAPO-34 (3.9 wt% Cu) is reported using the polymer Pluronic F127 as a mesoporous structure directing agent (SDA). X-Ray absorption spectroscopy (XAS) revealed single site ...

• Experimental Investigations of Single Oil Droplet Breakage in a Turbulent Water Flow 

  Herø, Eirik Helno (Doctoral theses at NTNU;2021:340, Doctoral thesis, 2021)

  Multiphase flow and the transient behavior of the dispersed phase is important to numerous industrial applications. Predictive modeling of the dispersed phase would be beneficial in designing, for example, phase separation ...

• Carbon Formation Mechanisms on Co Surfaces: A DFT Study 

  Jacobsen, Ida Emilie Malde (Master thesis, 2021)

  Fisher-Tropsch syntesen (FTS) er en katalytisk prosess hvor syngas omdannes til vann og hydrokarboner som for eksempel lange kjeder av alkaner, alkener og oksygenater. Interessen for FTS har økt på grunn av den økende ...

• The Fluid Flow Equations in General Curvilinear Coordinates solved with the SIMPLE Algorithm on a Staggered Curvilinear Grid 

  Grendstad, Ida Elise (Master thesis, 2021)

  Hovedmålet i denne mastergraden var å modellere strømningene over et bakovervendt steg ved å bruke SIMPLE algoritmen med et forskjøvet ikke-ortogonalt kurvelineært rutenett. SIMPLE ligningene ble løst i det beregnende ...

• Optimal Operation and Design of a Thermal Energy Storage Tank 

  Tysland, Agnes Camilla (Master thesis, 2021)

  Lagring av termisk energi (TES) gir en mulighet for å redusere energisvinn og mulighet for å øke nettverksfleksibiliteten i fjernvarmesystemer. Fornuftige TES-systemer i form av varmtvannsbeholdere under trykk kan brukes ...

• A Numerical Study of Newtonian and Non-Newtonian Fluid Flows Described in Curvilinear Coordinates 

  Bakke, Mari (Master thesis, 2021)

  En laminær, stasjonær strømning uten varmeoverføring i en kanal over et utvidet trinn (backwards facing step), ble løst ved bruk av finite volume method. Upwind differencing scheme og SIMPLE-algoritmen ble bruk til å ...

• Influence of Wax Inhibitor Molecular Weight on Solution Crystallization and Rheology of Monodisperse Waxes 

  Kurniawan, Muh; Ruwoldt, Jost; Norrman, Jens; Paso, Kristofer Gunnar (Peer reviewed; Journal article, 2021)

  Molecular weight fractionation via stepwise precipitation or chain scission is performed on four pour point depressant polymers to study the pour point reduction mechanism. An homologous series of model oils is prepared ...

• Nonlinear model predictive control of a multi-absorber CO2 capture plant 

  Tjessem, Vemund (Master thesis, 2021)

  I et etterforbrenning karbonfangstanlegg blir det brukt en aminløsning for å absorbere CO2. Aminløsningen blir regenerert i desorberkolonnen gjennom varme tilført i omkokeren. En stor driftskostnad ved et karbonfangstanlegg ...

• Application of Machine Learning in Economic Optimization 

  Vinh Phuc, Bui Nguyen (Master thesis, 2021)

  In this thesis, we introduced two new applications of Machine Learning in the field of Economic Optimization. The first application addresses the problem of searching for global Self-Optimizing variables. We applied Genetic ...

• Electrodialysis in Hydrometallurgical Processes 

  Zimmermann, Pauline; Tekinalp, Önder; Deng, Liyuan; Forsberg, Kerstin; Wilhelmsen, Øivind; Burheim, Odne Stokke (Chapter, 2020)

  Electrodialysis (ED) is an ionic exchange membrane process for separation of different components and species. In desalination, a large part of the energy is used to sustain a concentration difference between the solutions, ...

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