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Identification of carbon species on iron-based catalysts during Fischer-Tropsch synthesis
(Journal article; Peer reviewed, 2018)This paper focuses on the use of in situ and ex situ characterisation techniques to provide evidences of carbon species on a commercial iron-based Fischer-Tropsch synthesis catalyst as well as other indices of potential ... -
Identifying active constraintregions for optimal operationof process plants: With application to LNG and distillation processes
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:284, Doctoral thesis, 2011)Optimal operation and control of chemical processes depends on external conditions or disturbances. In order to achieve optimal or near-optimal control,one wants to control the active constraints, and the active constraints ... -
Impact of dissolved oxygen removal on solvent degradation for post-combustion CO2 capture
(Peer reviewed; Journal article, 2021)One of the major issues encountered in the Post Combustion CO2 Capture processes is the degradation of the solvent which can be in great part attributed to the presence of oxygen in the solution. The present report focuses ... -
The Impact of Operating Parameters on the Gas-Phase Sulfur Concentration after High Temperature Sulfur Sorption on a Supported Mo-Mn Sorbent
(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 ... -
Impact of Solvent on the Thermal Stability of Amines
(Peer reviewed; Journal article, 2022)Water-lean solvents have been proposed as a possible alternative to aqueous amine systems in postcombustion carbon capture. There is however little data available on how amine degradation is affected by different solvents. ... -
Implementation and evaluation of a new solution approach for semidefinite programming
(Master thesis, 2017)The main objective of this thesis was to perform initial studies on a new approach for solving semidefinite programs. In this solution method, a nonsmooth representation of the optimality conditions of semidefinite programs ... -
Implementation and Performance Analysis of Interior-Point Methods for Solving Mathematical Programs with Complementarity Constraints
(Master thesis, 2023)Denne avhandlinga tar for seg implementering og evaluering av løysningsmetodar for matematiske program med komplementaritetsavgrensingar, også kjent som MPCC. Desse løysningsmetodane baserer seg på ein bestemt ... -
Implementation of Extremum Seeking Control in an Experimental Lab-Rig
(Master thesis, 2021)I denne oppgaven implementeres Extremum seeking control (ESC) i en eksperimentell lab-rig som representerer et gassløftnettverk med tre brønner. ESC er en fullstendig datadrevet optimeringsmetode, der gradientene til ... -
Implementation of Real Time Optimization in an Experimental Lab Rig via Output Modifier Adaptation using Gaussian Processes
(Master thesis, 2022)I denne oppgaven blir Real Time Optimization (RTO) via Output Modifier Adaptation med Gaussian Processes (MAy-GP) implementert i en eksperimentell lab rigg. Riggen representerer et nettverk bestående av tre oljebrønner med ... -
Important Aspects Regarding the Chemical Stability of Aqueous Amine Solvents for CO2 Capture
(Journal article; Peer reviewed, 2022)The chemical stability of aqueous amines is an essential property to study before new amines are introduced in pilot plants, to reduce risks related to the operation, cost and environment. There are no standard methods for ... -
Improved lifetime and stability of copper species in hierarchical, copper-incorporated CuSAPO-34 verified by catalytic model reactions
(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 ... -
Improved Methods for Characterizing Emulsions by Low‑Resolution Nuclear Magnetic Resonance via Surface Relaxation and One‑Dimensional Images
(Peer reviewed; Journal article, 2023)The use of nuclear magnetic resonance (NMR) is an appropriate tool for studying colloids in a non-invasive manner. Droplet size distributions and one-dimensional sample profiles are readily produced to characterize an ... -
Improved Methods for Characterizing Emulsions by Low‑Resolution Nuclear Magnetic Resonance via Surface Relaxation and One‑Dimensional Images
(Peer reviewed; Journal article, 2023)The use of nuclear magnetic resonance (NMR) is an appropriate tool for studying colloids in a non-invasive manner. Droplet size distributions and one-dimensional sample profiles are readily produced to characterize an ... -
Improved PI control for a surge tank satisfying level constraints
(Journal article; Peer reviewed, 2018)This paper considers the case of averaging level control, where the main objective is to reduce flow variations by using varying liquid levels. However, to avoid overfilling or emptying the tank, the liquid level needs to ... -
Improved selectivity and coke resistance of core-shell alloy catalysts for propane dehydrogenation from first principles and microkinetic analysis
(Journal article; Peer reviewed, 2018)Microkinetic analysis combined with the results obtained from density functional theory calculations has been performed to examine the catalytic activity and selectivity of Pt-based core-shell alloy catalysts for propane ... -
Improving carbon efficiency and profitability of the biomass to liquid process with hydrogen from renewable power
(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 ... -
Improving Scenario Decomposition for Multistage MPC using a Sensitivity-based Path-following Algorithm
(Journal article; Peer reviewed, 2018)This letter proposes a computationally efficient algorithm for robust multistage scenario model predictive control (MPC). In multistage scenario MPC, the evolution of uncertainty in the prediction horizon is represented ... -
In situ characterization of industrial catalysts with Raman spectroscopy
(Master thesis, 2018)Raman spectroscopy is one of the most powerful characterization methods for in situ Raman study of catalytic materials and surfaces under working conditions. The use of Raman spectroscopy in catalytic NO oxidation would ... -
In-situ potassium poisoning on cobalt-based catalysts for Fischer-Tropsch synthesis
(Master thesis, 2023)I dag er det et faktum at etterspørselen etter energi øker, og det forventes at den vil fortsette å øke. I tillegg opplever verden nå en energikrise, både økonomisk og miljømessig. Derfor er det viktig å erstatte fossilt ...