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NiCo2O4 Catalyst on Commercial Low Surface Area and Synthesized High Surface Area CeO2 For Catalytic Methane Abatement in Natural Gas Engines
(Master thesis, 2020)Større utnyttelse av naturgass som marint brensel blir sett på som en mulig del av den globale, men også nasjonale løsningen med tanke på å redusere utslipp av klimagasser. Dette forutsetter midlertidig at overskuddsmetan ... -
Nitrogen-containing carbon nanofibers as supports for bimetallic Pt-Mn catalysts in aqueous phase reforming of ethylene glycol
(Peer reviewed; Journal article, 2023)Aqueous phase reforming (APR) of ethylene glycol was performed at 225 °C and 30 bar in batch and continuous reaction conditions. The effect on the APR performance by functionalizing carbon supports with nitrogen and adding ... -
Nitrogen-doped carbon nanofiber catalyst for ORR in PEM fuel cell stack: Performance, durability and market application aspects
(Journal article; Peer reviewed, 2016)A noble metal-free catalyst based on N-doped carbon nanofibers supported on graphite (N-CNF1 ) was employed for the oxygen reduction at the cathode of a Nafion PEMFC with a commercial Pt/C anode. Obtained performance in ... -
Nitrogen-Doped Carbon Nanofibers as Pt-Free Catalyst in the Oxygen Reduction Reaction - A study of iron nanoparticles as N-CNF catalyst on different supports
(Master thesis, 2015)A new approach was tested as nitrogen-doped carbon nanofibers (N-CNFs) were synthesized by using uniformly sized iron nanoparticles (FeNPs) on two different support as their growth catalyst. The N-CNFs are designed as a ... -
Nitrogen-doped Carbon Nanofibers for the Oxygen Reduction Reaction
(Doctoral theses at NTNU;2017:78, Doctoral thesis, 2017)Summary of thesis: One of the major obstacles for the commercialization of fuel cells is the necessity for high cost noble metals to facilitate the electrode reactions. Especially the oxygen reduction reaction (ORR) is ... -
Nitrogen-doped Carbon Nanofibers for the Oxygen Reduction Reaction: Importance of the Iron Growth Catalyst Phase
(Journal article; Peer reviewed, 2017)A systematic evaluation of the oxygen reduction reaction (ORR) on nitrogen-doped carbon nanofibers (N-CNFs) has been performed by tuning the properties of the N-CNFs by using chemical vapor deposition. Analysis of the ... -
Nitrogen-doped carbon nanofibers on expanded graphite as oxygen reduction electrocatalysts
(Journal article; Peer reviewed, 2016)A single-step chemical vapor deposition method using simple gaseous precursors was employed to grow nitrogen-doped carbon nanofibers from Fe and Ni particles on the surface of expanded graphite (N-CNF/EG). Due to the high ... -
Nitrogen‐Doped Carbon-Assisted One‐pot Tandem Reaction for Vinyl Chloride Production via Ethylene Oxychlorination
(Peer reviewed; Journal article, 2020)A bifunctional catalyst comprising CuCl2/Al2O3 and nitrogen‐doped carbon was developed for an efficient one‐pot ethylene oxychlorination process to produce vinyl chloride monomer (VCM) up to 76 % yield at 250 °C and under ... -
NMR as a tool to follow destabilization of water-in-oil emulsions
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:216, Doctoral thesis, 2011)Due to depletion of conventional sources and increasing demand for crude oil, the last years have shown a shift towards the exploitation of heavier and technologically more difficult feedstocks. This shift of focus means ... -
NMR Speciation of Aqueous MAPA, Tertiary Amines, and Their Blends in the Presence of CO2: Influence of pKa and Reaction Mechanisms
(Journal article; Peer reviewed, 2018)The diamine 3-(methylamino)propylamine (MAPA) and eight tertiary amines were studied as single and blended aqueous CO2 absorbents at different concentrations and ratios to investigate their reaction mechanisms. After ... -
NO oxidation catalyzed by high surface area perovskites
(Master thesis, 2018)The production of nitric acid is crucial for the production of fertilizer which is necessary to meet the world s demand for food. NO oxidation is one of three chemical steps in the nitric acid production, also called the ... -
NO til NO2 oksidasjon over koboltoksider på bærere
(Master thesis, 2019)Flertallet av salpetersyrebehovet går til produksjon av ammoniumnitrater, som brukes i produksjon av gjødsel. Produksjon av salpetersyre benytter Ostwald prosessen, hvor en av de tre reaksjonstrinnene er oksidasjonen av ... -
Noble Metal Promoted CoMn Catalysts for Fischer-Tropsch Synthesis
(Journal article; Peer reviewed, 2018)Noble metal (Pt, Re and Ru) promoters were investigated for Fischer–Tropsch synthesis at light olefin favouring conditions over Co–Mn catalysts. Characterisation and testing found promotion to increase catalyst activity ... -
A Non-Autonomous Relativistic Frame of Reference for Unit Operation Design
(Peer reviewed; Journal article, 2020)This contribution presents an efficient systematic algorithm for unit operation design that uses a newly developed non-autonomous relativistic frame of reference (NARF). The NARF is aimed towards the conceptual design of ... -
Non-linear dependency of wax appearance temperature on cooling rate
(Journal article, 2018)The Wax Appearance Temperature (WAT) is usually the first parameter to consider, when assessing whether paraffin wax contained in the crude oil can become an issue during production. As such, correct determination of the ... -
Non-linear rheology and direct numerical simulation of pressure propagation in gel
(Dr. ingeniøravhandling, 0809-103X; 2014:175, Doctoral thesis, 2014)Complex fluids are expected to demonstrate rheological behavior intermediate between solids (completely elastic) and fluids (completely viscous). However, despite abundant existence of complex fluids their rheological ... -
Nonlinear Model Predictive Control and Dynamic Real-Time Optimization of Semi-Batch Reactors - A Case Study of Expandable Polystyrene Production
(Master thesis, 2018)The aim of this thesis was to develop an advanced two-layer control structure for the semi-batch polymerization of expandable polystyrene (EPS) that minimizes the batch time while still producing a set polymer quality and ... -
Nonlinear model predictive control of a multi-absorber CO2 capture plant
(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 ... -
Nonlinear model predictive control of a semi-batch reactor for miniemulsion polymerization of vinyl chloride monomer
(Master thesis, 2023)Målet med denne avhandlingen var å implementere og teste ulineær modellbasert prediktiv regulering (NMPC) på en semi-batch reaktor for en miniemulsjonspolymerisasjonsprosess. Motivasjonen bak arbeidet i denne avhandlingen ... -
Nonlinear Model Predictive Control of Gravity Separators
(Master thesis, 2017)For economical reasons, it is necessary to operate separators such that the the purity specification is maximized while having the levels and the system pressure controlled. In this thesis, a nonlinear model predictive ...