Browsing Institutt for kjemisk prosessteknologi by Title
Now showing items 761-780 of 1784
-
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 ... -
Incoporating Ammonia Synthesis for an Offshore Gas-to-Liquid Process
(Master thesis, 2016)The world energy demand is increasing, and so is the demand for fertilizer to sustain an exponential population growth. Currently, with low oil prices, asso- ciated natural gas is flared off or re-injected into oil reservoirs ... -
Incorporation of an ionic liquid into a midblock-sulfonated multiblock polymer for CO2 capture
(Journal article; Peer reviewed, 2019)In the present work, hybrid block ionomer/ionic liquid (IL) membranes containing up to 40 wt% IL are prepared by incorporating 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) into a midblock-sulfonated pentablock ... -
Incorporation of Fe@Au nanoparticles into multiresponsive pNIPAM-AAc colloidal gels modulates drug uptake and release
(Journal article; Peer reviewed, 2016)Here, a synthetic method has been optimized for the synthesis of thermoresponsive and pH-responsive poly(N-isopropylacrylamide-co-acrylic acid) nanogels which are subsequently loaded with cytochrome C by using a modified ... -
Incorporation of Metallic Species into Midblock‐Sulfonated Block Ionomers
(Journal article; Peer reviewed, 2018)Block ionomers can, in the same fashion as their neutral block copolymer analogs, microphase‐order into various nanoscale morphologies. The added benefit of a copolymer possessing a charged species is that the resultant ... -
Inculding Prices in Control Structure Design - Applied on a Subsea Separation System
(Master thesis, 2016)The selection of controlled variables and measurements is an important aspect of the control structure design. Using the self-optimizing control framework makes it possible to select controlled variables as combinations ... -
Inflammatory responses and tissue reactions to wood-Based nanocellulose scaffolds
(Peer reviewed; Journal article, 2019)Two wood-derived cellulose nanofibril (CNF) porous scaffolds were prepared by TEMPO-oxidation and carboxymethylation. The effects of these scaffolds on the production of inflammatory cytokines by human macrophage-like cells ... -
Influence of acid concentration, temperature, and time on decrystallization in two-stage concentrated sulfuric acid hydrolysis of Pinewood and Aspenwood: A statistical Approach
(Journal article; Peer reviewed, 2012)The effects on sugar yields of acid concentration, temperature, and time in the first (decrystallization) stage of a two-stage concentrated sulfuric acid hydrolysis of softwood (Scots pine) and hardwood (aspen) were ... -
Influence of asphaltene aggregation and pressure on crudeoil emulsion stability
(Doktoravhandlinger ved NTNU, 1503-8181; 81, Doctoral thesis, 2002)Water-in-crude oil emulsions stabilised by various surface-active components are one of the major problems in relation to petroleum production. This thesis presents results from high-pressure separation experiments on ... -
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 ... -
Influence of Asphaltenes on Gelation of Tetrameric Acid with Calcium Ion at the Oil/Water Interface under Flow-Model Condition
(Peer reviewed; Journal article, 2020)The first step in calcium naphthenate deposition is supposed to be the formation of an interfacial gel by cross-linking between ARN tetrameric acid and Ca2+. Several aspects of the inhibition of the interfacial gel formation ... -
Influence of Carbon Support on Electronic Structure and Catalytic Activity of Pt Catalysts: Binding to the CO Molecule
(Journal article, 2016)Single-atom catalysts, especially with single Pt atoms, exhibit potentially improved catalytic activity as compared to metal clusters and metal surfaces. Here, the atop and bridged bondings of the CO molecule on the Pt/C ... -
The influence of divalent cations on the dynamic surface tension of sodium dodecylbenzenesulfonate solutions
(Peer reviewed; Journal article, 2023)The kinetics of surfactant adsorption at interfaces is crucial in many industrial settings. Maximum bubble pressure tensiometry allows accessing the adsorption at time scales of tens of ms to uncover the initial stages of ... -
Influence of experimental setup on amine degradation
(Journal article; Peer reviewed, 2014)Chemical stability of amines under CO2 capture conditions is a well known problem both for process operability and related to economy and environmental issues. Many degradation studies have been conducted under different ...