Institutt for kjemisk prosessteknologi
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Excess-Methane CO2 Reforming over Reduced KIT-6-Ni-Y Mesoporous Silicas Monitored by In Situ XAS–XRD
(Journal article; Peer reviewed, 2023)Making Europe less dependent on imported fuels requires a long-term strategy. Low-quality natural gas and biogas could be used to mitigate the energy crisis, and excess-methane dry reforming has the potential to upgrade a ... -
Steady-State and Transient Kinetic Investigations of the Oxidation of NO over Pt/SiO2
(Journal article; Peer reviewed, 2024)The reaction mechanism of the oxidation of NO under conditions of high NO concentration over a 2 wt% Pt/SiO2 was studied using both kinetic and transient isotopic tracing experiments. The reaction mechanism was found to ... -
Gasskraftverk med CO2-håndtering - Studie av alternative teknologier
(Research report, 2002)Rapporten dokumenterer en studie som beskriver og sammenligner 12 ulike teknologier for gasskraftverk med CO2-håndtering. Merkostnaden for å fjerne CO2 i forbindelse med elektrisitetproduksjon er i studien beregnet til ... -
The Simple Solution for Nonlinear State Estimation of Ill-Conditioned Systems: The Normalized Unscented Kalman Filter
(Journal article; Peer reviewed, 2023)An easy-to-implement method for nonlinear state estimation for ill-conditioned systems is proposed. By propagating standard deviations and correlations instead of the covariance in the unscented Kalman filter (UKF), the ... -
Alterations in paraffin wax crystal networks induced by asphaltenes and pour point depressants, investigated by atomic force microscopy
(Peer reviewed; Journal article, 2024)Wax crystallization in pipelines in cold environments is a key factor affecting flow assurance during crude oil production. Polar crude oil components, such as asphaltenes, and polymeric pour point depressants (PPDs) have ... -
Simple and Robust Formulations of the Unscented Kalman Filter and Model Predictive Control
(Doctoral theses at NTNU;2024:93, Doctoral thesis, 2024)This thesis focuses mainly on state estimation by the Unscented Kalman filter (UKF), and partly on robust nonlinear model predictive control (RNMPC). Our aim is to refine or develop algorithms which are simple to implement, ... -
Oxidative degradation of triethylene glycol
(Journal article; Peer reviewed, 2024)Triethylene glycol (TEG) is unstable in the presence of oxygen and at high temperatures, though the degradation mechanisms occurring are not properly understood. In attempting to close some of the knowledge gaps, ... -
Experimental and Numerical Results of a Non-DLE Aeroderivative GT Combustion System Burning Methane-Ammonia Blends at Intermediate Pressures
(Chapter, 2023)Ammonia is considered as a practical hydrogen carrier, as it can be stored in liquid form at moderate pressures and temperatures and is commonly produced and transported today. Ammonia could be used directly as a Gas Turbine ... -
Measurements of the Viscosity of Hydrogen and a (Hydrogen + Methane) Mixture with a Two-Capillary Viscometer
(Journal article; Peer reviewed, 2024)Measurements of the viscosity of pure hydrogen and a binary (hydrogen + methane) mixture with a nominal composition 90 mol % hydrogen are presented. The measurements were conducted with a two-capillary viscometer relative ... -
Sorption-enhanced Fischer-Tropsch synthesis – Effect of water removal
(Peer reviewed; Journal article, 2024)The Sorption-Enhanced Fischer-Tropsch synthesis (SEFTS), with water removal by means of a solid sorbent, has been demonstrated for the first time experimentally. Commercial water sorbents (Zeolites type 13X and 4 A) were ... -
Advances in Optimisation and Machine Learning for Process Systems Engineering
(Doctoral theses at NTNU;2024:85, Doctoral thesis, 2024)Optimisation is a valuable tool in process systems engineering, and has been widely used in design, control, process identification and many other areas. This thesis proposes novel applications of optimisation, as well as ... -
Self-Optimizing Control of an Offshore Blue Hydrogen Plant
(Master thesis, 2023)Utviklingen av fornybare energikilder øker stadig, men ytterligere fremgang er nødvendig. Oppdagelsen av nye metoder for å produsere miljøvennlig drivstoff og energikilder er avgjørende, med hydrogen som et lovende alternativ. ... -
Steam reforming of biomass gasification tar impurities with Ni-Co/Mg(Al)O catalysts: Experimental studies using model tar components
(Doctoral theses at NTNU;2024:78, Doctoral thesis, 2024)Hydrotalcite-derived Ni-Co/Mg(Al)O catalysts with a range of different Ni-Co ratios, Ni+Co loading, calcination temperatures and noble metal promotion (Pt/Pd/Rh) were prepared, targeting low-coking steam reforming of biomass ... -
The influence of asphaltenes and pour point depressants on the paraffin wax crystallization investigated by nuclear magnetic resonance and atomic force microscopy
(Doctoral theses at NTNU, 2024:67, Doctoral thesis, 2024)Wax crystallization in pipelines in cold environments is a key challenge for flow assurance during oil production. Pour point depressants have been used to delay wax crystallization and gelling, by modifying rheological ... -
Conversion of Biomass to Aviation Fuel by Hydropyrolysis and Vapors Upgrading
(Master thesis, 2023)The world is moving towards more sustainable energy generation techniques and renewable energy sources, there has been a dire need for alternatives to come into play now and enormous studies have already been done for ... -
Biomimetic Highly Porous Nanocellulose-Nanohydroxyapatite Scaffolds for Bone Tissue Engineering
(Peer reviewed; Journal article, 2024)Wood-derived TEMPO-oxidized cellulose nanofibrils (CNFs) have potential as scaffolding for bone tissue engineering. Although biocompatible, the material lacks osteoconductive and appropriate mechanical properties. Incorporation ... -
A framework for predicting odor threshold values of perfumes by scientific machine learning and transfer learning
(Journal article; Peer reviewed, 2023)Knowledge of odor thresholds is very important for the perfume industry. Due to the difficulty associated with measuring odor thresholds, empirical models capable of estimating these values can be an invaluable contribution ... -
Super selective ammonia separation through multiple-site interaction with ionic liquid-based hybrid membranes
(Peer reviewed; Journal article, 2021)Efficient separation and recovery of ammonia (NH3) is essential for environmental protection and resource utilization. In this work, hybrid membranes for NH3 separation through multiple-site interaction were developed by ... -
Hydrogen sulfide removal from natural gas using membrane technology: a review
(Peer reviewed; Journal article, 2021)Natural gas, having a significantly lower CO2 emission factor than oil and coal when combusted, is accepted as an important transition fuel towards carbon net-zero society. To meet the calorific value requirements (≥34.0 ... -
Membrane fabricated via a facile non-solvent induced microstructure re-arrangement with superior CO<inf>2</inf> separation performances
(Journal article; Peer reviewed, 2023)CO2 capture and storage (CCS) is taken as an immediate solution to mitigate the impactof increasing atmospheric CO2 on global climate change, and CO2 separation using high-performance membranes is considered a green and ...