Blar i NTNU Open på forfatter "Holmen, Anders"
-
Hydrophobic Catalyst Support Surfaces by Silylation of γ-Alumina for Co/Re Fischer-Tropsch Synthesis
Rytter, Erling; Salman, Ata ul Rauf; Tsakoumis, Nikolaos; Myrstad, Rune; Yang, Jia; Lögdberg, Sara; Holmen, Anders; Rønning, Magnus (Journal article; Peer reviewed, 2018)Eight different silanes with chloro or methoxy active ligands have been examined to modify the surface of a standard γ-alumina support to investigate the effect of surface acidity and hydrophobicity in Fischer-Tropsch ... -
Influence of temperature during pyrolysis of Fe-alginate: Unraveling the pathway towards highly active Fe/C catalysts
Tafjord, Joakim; Regli, Samuel K.; Dugulan, Achim Iulian; Rønning, Magnus; Rytter, Erling; Holmen, Anders; Myrstad, Rune; Yang, Jia (Peer reviewed; Journal article, 2022)Transition metals supported on carbons play an important role in catalysis and energy storage. By pyrolysis of metal alginate, highly active catalysts for the Fischer-Tropsch synthesis (FTS) can be produced. However, the ... -
Investigation of C1+C1 coupling reactions in cobalt-catalyzed Fischer-Tropsch synthesis by a combined DFT and kinetic isotope study
Qi, Yanying; Yang, Jia; Holmen, Anders; Chen, De (Journal article; Peer reviewed, 2019)Understanding the chain growth mechanism is of vital importance for the development of catalysts with enhanced selectivity towards long-chain products in cobalt-catalyzed Fischer-Tropsch synthesis. Herein, we discriminate ... -
Influence of H2 on the Oxygen-Assisted Dehydrogenation of Ethane over Al2O3-supported Pt–Sn Catalysts
Radstake, Paul B.; Rønning, Magnus; Holmen, Anders (Journal article; Peer reviewed, 2018)The oxygen-assisted dehydrogenation of ethane at 650 °C shows that adding Sn to the Pt catalyst results in increased conversion and selectivity to ethylene. Even the smallest amount of tin (0.16 wt%) has a significant ... -
Kinetics and Deactivation in the Methanol Synthesis Reaction
Alam, Mahmud (Master thesis, 2011)This study is highlighting the synthesis of methanol by using Cu-based ( ) catalyst and synthesis gas, which consists a mixture of CO, CO2, H2, N2 and CH4. The catalyst was prepared as per the procedure described by the ... -
Mechanistic Insights into Cobalt-based Fischer-Tropsch Synthesis
Qi, Yanying (Doctoral thesis at NTNU;2016:106, Doctoral thesis, 2016)Fischer-Tropsch synthesis (FTS) is an alternative process of yielding transportation fuels and chemicals by converting syngas derived from natural gas, biomass and coal. Cobalt-based catalysts are favorable catalysts for ... -
Methane activation on bimetallic catalysts: properties and functions of surface Ni-Ag alloy
Dam, Anh Hoang; Wang, Hongmin; Dehghan-Niri, Roya; Yu, Xiaofeng; Walmsley, John; Holmen, Anders; Yang, Jia; Chen, De (Peer reviewed; Journal article, 2019)The paper presents a fundamental study of the properties and functions of well‐defined Ni−Ag surface alloys in methane decomposition and steam reforming, aiming at providing a better understanding of the principle for ... -
Monolithic, microchannel and carbon nanofibers/carbon felt reactors for syngas conversion by Fischer-Tropsch syntehesis
Holmen, Anders; Venvik, Hilde Johnsen; Myrstad, Rune; Zhu, Jun; Chen, De (Journal article; Peer reviewed, 2013)The present contribution summarizes work carried out on different microstructured reactors in the Catalysis Group at the Norwegian University of Science and Technology during the last years. The work has involved co-operation ... -
Nanostructural Analysis of Co-Re/γ-Al2O3 Fischer-Tropsch Catalyst by TEM and XRD
Dehghan-Niri, Roya; Tsakoumis, Nikolaos E.; Voronov, Alexey; Holmen, Anders; Holmestad, Randi; Vullum, Per Erik; Borg, Øyvind; Rytter, Erling; Rønning, Magnus; Walmsley, John (Journal article; Peer reviewed, 2022)A rhenium promoted Fischer-Tropsch (FT) cobalt catalyst supported on γ-Al2O3 has been investigated by Transmission Electron Microscopy (TEM) and X-ray Diffraction (XRD), before and after reduction. Electron diffraction, ... -
New mechanism insights into methane steam reforming on Pt/Ni from DFT and experimental kinetic study
Niu, Juntian; Wang, Yalan; Qi, Yanying; Dam, Anh Hoang; Wang, Hongmin; Zhu, Yi-An; Holmen, Anders; Ran, Jingyu; Chen, De (Peer reviewed; Journal article, 2020)In this contribution, we combine density functional theory (DFT) calculations, experimental kinetic study and DFT-assisted analysis to elucidate the impact of the interface of monolayer Pt on the Ni surface on catalytic ... -
Pd/CeO2 catalysts as powder in a fixed-bed reactor and as coating in a stacked foil microreactor for the methanol synthesis.
Phan, Xuyen Kim; Walmsley, John Charles; Bakhtiary Davijany, Hamidreza; Myrstad, Rune; Pfeifer, Peter; Venvik, Hilde Johnsen; Holmen, Anders (Journal article; Peer reviewed, 2016)Pd/CeO2 as a catalyst for methanol synthesis has been studied in a microreactor consisting of 14 structured foils in a fixed-bed laboratory reactor. Methanol synthesis was carried out at 80 bar and 300 °C with a syngas ... -
Perspectives on the Effect of Water in Cobalt Fischer-Tropsch Synthesis
Holmen, Anders; Rytter, Erling (Journal article; Peer reviewed, 2017)Water is an inherent component in Fischer–Tropsch synthesis on Co catalysts, and the effect of water is discussed with an emphasis on alumina and aluminates as support materials. Water may affect the selectivity, activity, ... -
Potassium adsorption behavior on hcp cobalt as model systems for the Fischer–Tropsch synthesis: a density functional theory study
Chen, Qingjun; Svenum, Ingeborg-Helene; Qi, Yanying; Gavrilovic, Ljubisa; Chen, De; Holmen, Anders; Blekkan, Edd Anders (Journal article; Peer reviewed, 2017)Potassium (K), an important impurity in syngas from biomass, can have a large influence on the activity and selectivity of cobalt-based Fischer–Tropsch synthesis (FTS) catalysts in Biomass to Liquids (BTL) processes. In ... -
Promotional effect of in-situ generated hydroxyl on olefin selectivity of Co-catalyzed Fischer-Tropsch synthesis
Qi, Yanying; Aaserud, Christian; Yang, Jia; Holmen, Anders; Chen, De (Peer reviewed; Journal article, 2019)The understanding of the water effect on olefin selectivity in Fischer–Tropsch synthesis (FTS) is limited by the complexity of the reaction network. Herein, we employ propene hydrogenation as a model reaction to isolate ... -
Reaction mechanism of CO activation and methane formation on Co Fischer-Tropsch catalyst: A combined DFT, transient, and steady-state kinetic modeling
Yang, Jia; Qi, Yanying; Zhu, Jun; Zhu, Yi-An; Chen, De; Holmen, Anders (Journal article; Peer reviewed, 2013)A new approach for elucidating reaction mechanism of complex reactions, such as Fischer–Tropsch (F–T) synthesis, is presented. It includes a combination of integrated transient and steady-state kinetic modeling, experimental ... -
Recent Progresses in Understanding of Co-Based Fischer–Tropsch Catalysis by Means of Transient Kinetic Studies and Theoretical Analysis
Qi, Yanying; Yang, Jia; Chen, De; Holmen, Anders (Journal article; Peer reviewed, 2015)During the last years it has been an increasing focus on fundamental studies of the Fischer–Tropsch synthesis (FTS). Steady-state isotopic transient kinetic analysis and first principles investigation have proven to be ... -
SiC supported Co catalysts for the Fischer-Tropsch synthesis
Håvik, Sindre (Master thesis, 2012)With rising crude oil prices and outlook of declining crude oil production, conversion of natural gas into liquid fuels is gaining worldwide interest. Fischer-Tropsch synthesis is an important tool in achieving this ... -
Significance of C3 Olefin to Paraffin Ratio in Cobalt Fischer–Tropsch Synthesis
Rytter, Erling; Yang, Jia; Borg, Øyvind; Holmen, Anders (Peer reviewed; Journal article, 2020)The ratio between propene and propane (C3 o/p) during Fischer–Tropsch synthesis (FTS) has been analyzed based on both literature reports and experiments for five catalysts. The latter comprise four cobalt catalysts on ... -
Surface Modified γ-Alumina Supports For Cobalt Fischer-Tropsch Catalysts
Salman, Ata ul Rauf (Master thesis, 2015)Fischer-Tropsch synthesis over cobalt based catalysts is an important route for the conversion of syngas, derived from natural gas, to liquid fuels. Fischer-Tropsch performance of cobalt catalysts depends on a number of ... -
Synthesis and Characterisation of Co-based Fischer-Tropsch Catalysts and Supports, using hydrothermal and chemical attrition Method - The magnesium moderation Effect
Karlsen, Aina Elin (Master thesis, 2011)Magnesium modification at different calcination temperatures of γ-alumina supports for cobalt Fischer-Tropsch catalysts was investigated. Support modification and catalyst preparation were performed by applying the incipient ...