Browsing NTNU Open by Author "Mathisen, Karina"
Now showing items 1-20 of 51
-
An In Situ XAS Study of the Cobalt Rhenium Catalyst for Ammonia Synthesis
Mathisen, Karina; Kirste, Karsten Granlund; Hargreaves, Justin S. J. (Journal article; Peer reviewed, 2018)A cobalt rhenium catalyst active for ammonia synthesis at 400 °C and ambient pressure was studied using in situ XAS to elucidate the reducibility and local environment of the two metals during reaction conditions. The ... -
An In-situ FTIR Study of the Methanol to Hydrocarbons Reaction Over Zeolite Catalysts
Forselv, Stian (Master thesis, 2011)This thesis investigates several different types of zeolites during the conversion of methanol to hydrocarbons, and examines the effects of the differences between them. All samples were characterized by SEM, XRD, ICP-MS ... -
Characterization of Gold and Copper Species in Nanoporous Materials
Opsahl, Anette (Master thesis, 2012)Global warming and energy production from other sources than fossil fuels have the last years attracted more and more attention. Catalysis plays an important role in controlling the emission of greenhouse gases and other ... -
Copper incorporated silica aerogels: effect of synthesis parameters, characterisation and catalytic applications
Ertesvåg, Ragnhild Lea (Master thesis, 2022)Abstract will be available on 2024-07-01 -
Coupled cluster investigations of spectroscopic properties in molecular and crystalline systems
Hutcheson, Anders (Doctoral theses at NTNU;2022:343, Doctoral thesis, 2022)Theoretical studies of spectroscopic properties are of great value, both by themselves and in combination with experiments. The highly accurate coupled cluster methods are attractive options for such studies. Due to their ... -
COx-free hydrogen production from ammonia – mimicking the activity of Ru catalysts with unsupported Co-Re alloys
Kirste, Karsten Granlund; McAulay, Kate; E. Bell, Tamsin; Stoian, Dragos; Laassiri, Said; Hargreaves, Justin S. J.; Mathisen, Karina; Torrente-Murciano, Laura (Peer reviewed; Journal article, 2020)On-demand production of hydrogen from ammonia is a challenge limiting the implementation of ammonia as a long term hydrogen vector to overcome the difficulties associated with hydrogen storage. Herein, we present the ... -
Developing synthesis route for CuSAPO-18
Botten, Sigurd Norum (Master thesis, 2019)I dette arbeidet ble synthese av SAPO-18 med kobber isomorfisk substituert forsøkt via en hydrotermisk metode. Metoder basert på di-isopropyletylamin (DIPEA) ble funnet til å redusere deler av eller alt kobberet til ... -
The Effect of mechanical mixing and Porosity on the Activity of Ag and Cu Ion exchanged Zeotypes in the HC-SCR of NOx with Propene
Botne, Georg (Master thesis, 2017)Abstract The effect of mechanical mixing and porosity of Ag and Cu ion exchanged zeotypes in the hydrocarbon selective catalytic reduction (HC-SCR) of NOx with propene has been investigated. To this effect, mordenite, ... -
Effect of Porosity and Copper Content on Copper Containing SAPO-34 for Removal of NOx
Hutcheson, Anders (Master thesis, 2018)In this thesis, hierarchical SAPO-34 with copper isomorphously substituted(H/CuSAPO-34) was attempted synthesised, by a hydrothermal method. As a step in the process, hierarchical SAPO-34 without copper(H/SAPO-34) was ... -
Effect of Porosity on the Hydrothermal Stability of CuSAPO-34 for the deNOx Process
Sørli, Guro (Master thesis, 2016)Hierarchical SAPO-34 with incorporated copper was tried synthesised both through a dry gel conversion and a hydrothermal method. Crystalline copper incorporated hierarchical SAPO-34 was not obtained through these directions. ... -
Evaluating characterization methods for new porous functional materials
Ali, Daniel (Doctoral theses at NTNU;2021:312, Doctoral thesis, 2021)This thesis is concerned with the development and evaluation of characterization methods for new porous functional materials. Functionalized one-dimensional silicoaluminophosphates (SAPOs) were chosen as model systems for ... -
Evaluation of surfactant templates for one-pot hydrothermal synthesis of hierarchical SAPO-5
Ali, Daniel; Zeiger, Caren; Azim, Muhammad Mohsin; Lein, Hilde Lea; Mathisen, Karina (Peer reviewed; Journal article, 2020)Hierarchical SAPO-5 molecular sieves were synthesized with three different mesopore structure-directing agents (meso-SDAs) (cetyltrimethylammonium bromide (CTAB), myristyltrimethylammonium bromide (MTMAB) and [3-(trime ... -
Fe-ZSM-5 og Fe-SAPO-34 Katalysatorer for Lavtemperatur Selektiv Katalytisk Reduksjon av NOx med NH3
Landfald, Lisa Leganger (Master thesis, 2019)Jernbaserte katalysatorer med zeolitten ZSM-5 og zeotypene konvensjonell SAPO-34 og hierarkisk SAPO-34 som bærere ble laget for å undersøke katalytiske opptredenen for selektiv katalytisk reduksjon av NOX med NH3 ved lavere ... -
Functionalization of Silica Aerogels and AlPO-5 with Molybdenum, Rhenium - A Study on Metal Introduction Methods
Liu, Tengzhi (Master thesis, 2018)In the present work possible routes for the introduction of Mo and Re into silica aerogels and aluminophosphate AlPO-5 have been investigated. Parameter studies on the influence of synthesis conditions including metal ... -
Hierarchical SAPO-34 Catalysts as Host for Cu Active Sites
Fernandes Pape Brito, Julio C.; Miletto, Ivana; Marchese, Leonardo; Ali, Daniel; Azim, Muhammad Mohsin; Mathisen, Karina; Gianotti, Enrica (Peer reviewed; Journal article, 2023)Cu-containing hierarchical SAPO-34 catalysts were synthesized by the bottom-up method using different mesoporogen templates: CTAB encapsulated within ordered mesoporous silica nanoparticles (MSNs) and sucrose. A high ... -
Hydrothermal synthesis of materials for intermediate band solar cells
Mikalsen, Ragni Fjellgaard (Master thesis, 2013)Solar energy is an abundant energy source that may provide an environmentallyfriendly alternative to fossil fuels. The utilization of the solar energy have so farbeen limited by various energy losses in the photovoltaic ... -
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 ... -
In situ X-ray absorption spectroscopic studies of unsupported and supported CoRe during ammonia synthesis/ammonia decomposition
Kirste, Karsten Granlund (Doctoral theses at NTNU;2021:407, Doctoral thesis, 2021)In situ X-ray absorption spectroscopy (XAS) studies are crucial for studying the local environment, oxidation state and speciation of transition metals during thermal pre-treatments and during working conditions of catalysts. ... -
Incorporation of Iron(III) in Silica Aerogels
Kristoffersen, Simeon (Master thesis, 2016)Silica aerogels containing both single site Fe3+ as well as small FexOy nanoparticles of oxide/hydroxide species were synthesized from a waterglass precursor using co-precursor and ambient pressure drying techniques. Fe3+ ... -
Incorporation of Rhenium in ITQ-33
Knapperholen, Øyvind (Master thesis, 2016)ITQ-33 was synthesized by the fluorine route, and the last of three batches was considered phase pure. The as-synthesized samples were then treated with different alkaline and acidic solutions (degermanation), to determine ...