Browsing NTNU Open by Author "Venvik, Hilde Johnsen"
Now showing items 1-20 of 54
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Activity and segregation behavior of Pd75%Ag25%(1 1 1) during CO oxidation – An in situ NAP-XPS investigation
Svenum, Ingeborg-Helene; Strømsheim, Marie D.; Knudsen, Jan; Venvik, Hilde Johnsen (Journal article; Peer reviewed, 2022)The surface reactivity during CO oxidation over Pd(1 1 1) and Pd75%Ag25%(1 1 1) single crystals has been investigated using near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) under excess oxygen conditions ... -
Application of hot-wire anemometry for experimental investigation of flow distribution in micro-packed bed reactors for synthesis gas conversion
Dadgar, Farbod; Venvik, Hilde Johnsen; Pfeifer, Peter (Journal article; Peer reviewed, 2018)The knowledge of the flow distribution inside microstructured reactors is valuable e.g. for improving the reactor design, developing flow distributors, and optimizing the catalyst loading method. The applicability of the ... -
Bifunctional catalyst for direct DME synthesis
Esmaelpour, Ayob (Master thesis, 2011)New technologies produce liquids from synthesis gas in the gas to liquids technology (GTL). Dimethyl ether made from synthesis gas is one such possible process. DME is more or less claimed to be a renewable fuel that solves ... -
Carbon Formation and Catalysis in the Conversion of Methyl Chloride and Silicon into Dimethyldichlorosilane - Collaboration with Elkem - Bluestar
Tysseland, Amalie (Master thesis, 2018)The Direct Process is the most prominent method for producing dimethyldichlorosilane, and is a copper-catalyzed reaction between solid silicon and methyl-chloride gas. The process faces several complications such as the ... -
Catalysis for Control of Methane Slip in Marine Machinery - Using a Palladium based Catalyst
Sandvik, Helene Mørkkåsa (Master thesis, 2016)In a world distributing more and more liquefied natural gas (LNG), due to it`s advantages within health, environment and energy compared to gasoline and diesel, it is favourable to research more within this area. The main ... -
Catalysis for control of methane slip in marine machinery - Using platinum-based catalysts
Storrvik, Hanna Marie (Master thesis, 2016)Greenhouse gas abatement in the shipping industry has become increasingly relevant in the recent years, due to stricter laws and regulations. The use of ships running on liquid natural gas is thus growing rapidly in the ... -
Catalysis in microstructured reactors - short review on smallscale syngas production and further conversion into methanol, DME and Fischer-Tropsch products
Venvik, Hilde Johnsen; Yang, Jia (Journal article; Peer reviewed, 2017)Synthesis gas production and further conversion via the Fischer-Tropsch, methanol and dimethyl ether (DME) syntheses is currently economic only in the large scale. Compact, modular, and safe technology efficient in smaller ... -
Catalyst Deactivation During One-Step Dimethyl Ether Synthesis from Synthesis Gas
Dadgar, Farbod; Myrstad, Rune; Pfeifer, Peter; Holmen, Anders; Venvik, Hilde Johnsen (Journal article; Peer reviewed, 2017)Catalysts for direct synthesis of dimethyl ether (DME) from synthesis gas should essentially contain two functions, i.e., methanol synthesis and methanol dehydration. In the present work, the deactivation of both functions ... -
Catalytic Methane Abatement for Natural Gas Engines
Granlund, Helene Marie Eng (Master thesis, 2018)To reduce the greenhouse emissions it is proposed to use natural gas vehicles in the marine sector, instead of conventional vehicles using heavy fuel oil. Use of natural gas will reduce NOx, SOx and CO2 emissions, and will ... -
Deactivation of Co-Based Fischer−Tropsch Catalyst by Aerosol Deposition of Potassium Salts
Gavrilovic, Ljubisa; Brandin, Jan; Holmen, Anders; Venvik, Hilde Johnsen; Myrstad, Rune; Blekkan, Edd Anders (Journal article; Peer reviewed, 2018)A 20%Co/0.5%Re/γAl2O3 Fischer−Tropsch catalyst was poisoned by four potassium salts (KNO3, K2SO4, KCl, and K2CO3) using the aerosol deposition technique, depositing up to 3500 ppm K as solid particles. Standard characterization ... -
Direct dimethyl ether synthesis from synthesis gas: The influence of methanol dehydration on methanol synthesis reaction
Dadgar, Farbod; Myrstad, Rune; Pfeifer, Peter; Holmen, Anders; Venvik, Hilde Johnsen (Journal article; Peer reviewed, 2016)Direct dimethyl ether (DME) synthesis from synthesis gas is studied with regard to potential effects of methanol dehydration on methanol formation and copper-based catalyst performance. For this, the influence of the ... -
Direct Non-Oxidative Conversion of Methane to C2 Hydrocarbons, Aromatics and Hydrogen
Bodnar, Matus (Master thesis, 2017)Catalytic activity of Fe/HZSM-5 and Mo/HZSM-5 during methane dehydroaromatization was investigated. The catalysts were prepared by wet impregnation method, calcinated in air flow, tested in laboratory reactor and characterized ... -
Direct Nonoxidative Conversion of Methane to C2 Hydrocarbons, Aromatics and Hydrogen
Hovd, Benedicte (Master thesis, 2016)Natural gas contains a large quantity of methane that is valuable as a fuel source. However, it can also be converted to light olefins, but the present synthesis route includes the conversion into synthesis gas. This is ... -
Direct Synthesis of Dimethyl Ether in Microstructured Reactors: The Interactions Between Methanol Synthesis and Methanol Dehydration
Dadgar, Farbod (Doctoral thesis at NTNU;2016:179, Doctoral thesis, 2016)The growing concerns about the climate change, energy security and the diminishing oil reserves, stimulate the search for alternative energy sources and non-petroleum-based fuels. Natural gas in the short-term, and biomass ... -
Effect of Copper Catalyst Content and Zinc Promoter on Carbon Formation in the Direct Synthesis of Methylchlorosilanes
Mahmoodinia, Mehdi; Farooq, Hammad; Røe, Torbjørn; Svenum, Ingeborg-Helene; Venvik, Hilde Johnsen (Journal article; Peer reviewed, 2023)Direct synthesis of methylchlorosilanes (MCS) is a complex solid–gas–solid reaction where solid silicon (Si) reacts with chloromethane (CH3Cl) in the presence of a copper (Cu)-based catalyst, and coke formation by cracking ... -
Effect of CuCl and Zn on Cu3Si Formation and Coke Deposition in the Direct Synthesis of Dimethyldichlorosilane
Farooq, Hammad (Master thesis, 2020)The direct synthesis of dimethyldichlorosilane has been studied for more than 60 years, owing to its significance in the silicones industry. The direct process is a reaction of distinct complexity because of silicon taking ... -
Effects of K adsorption on the CO-induced restructuring of Co(11-20)
Strømsheim, Marie Døvre; Svenum, Ingeborg-Helene; Farstad, Mari Helene; Li, Zheshen; Gavrilovic, Ljubisa; Guo, Xiaoyang; Lervold, Stine; Borg, Anne; Venvik, Hilde Johnsen (Journal article; Peer reviewed, 2017)The location of potassium (K) on Cobalt (Co) and its effect on adsorption and adsorption-induced surface restructuring is important for understanding the deactivation of Co Fischer-Tropsch catalysts and the nature of the ... -
Effects of metal dusting relevant exposures of alloy 601 surfaces on carbon formation and oxide development
Guo, Xiaoyang; Vanhaecke, Estelle Marie M.; Vullum, Per Erik; Ma, Jianyu; Panditha Vidana, Daham Sanjaya Gunawardana; Walmsley, John; Chen, De; Venvik, Hilde Johnsen (Peer reviewed; Journal article, 2020)Ni and Fe are excellent catalysts for carbon formation, and industrial alloys are therefore susceptible to metal dusting corrosion; a costly issue in e.g. synthesis gas manufacture. The objective of this work is to better ... -
Effects of Potassium and Copper Promoters on Iron Fischer-Tropsch Catalysts
Hole, Nils-Olav Andersen (Master thesis, 2015)The demand for energy is an ever increasing problem in the world today. The need for more abundant energy sources to take over the role of crude oil is becoming more and more present. GTL processes (gas-to-liquid), which ... -
Establishing Characterization and Methodology for Analyzing Performance of Commercial Particulate Silver Catalyst for Formalin Production
Naustdal, Vegard (Master thesis, 2016)Formaldehyde is the simplest aldehyde and is an active organic compound in many reactions making it a versatile building block for the chemical industry. Formaldehyde can be produced by partial oxidative dehydrogenation ...