Browsing Kjemisk institutt by Author "Wragg, David"

Now showing items 1-19 of 19

  • Canted antiferromagnetism in high-purity NaFeF3 prepared by a novel wet-chemical synthesis method 
    Bernal, Fabian Leonardo Martinez; Gonano, Bruno Raymond Gino; Lundvall, Fredrik; Wragg, David; Fjellvåg, Helmer; Veillon, Fabien; Sławińsk, Wojciech; Fjellvåg, Øystein (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We report a synthesis method, and structural and magnetic characterization, for the fluoroperovskite NaFeF3. We have developed a wet-chemical method that allows preparation of large volumes of air-sensitive fluoroperovskites ...
  • Characterization and evaluation of synthetic Dawsonites as CO2 sorbents 
    Lundvall, Fredrik; Kalantzopoulos, Georgios N.; Wragg, David; Arstad, Bjørnar; Blom, Richard; Sjåstad, Anja Olafsen; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    The sorbent enhanced water-gas shift (SEWGS) process has great potential for CO2 capture and is thereby a realistic alternative to conventional post-combustion capture by gas emission scrubbing. Nevertheless, better ...
  • Chemical Structures of Specific Sodium Ion Battery Components Determined by Operando Pair Distribution Function and X-ray Diffraction Computed Tomography 
    Sottmann, Jonas; Di Michiel, Marco; Fjellvåg, Helmer; Malavasi, Lorenzo; Margadonna, Serena; Vajeeston, Ponniah; Vaughan, Gavin B M; Wragg, David (Journal article / Tidsskriftartikkel / SubmittedVersion, 2017)
    To improve lithium and sodium ion battery technology, it is imperative to understand how the properties of the different components are controlled by their chemical structures. Operando structural studies give us some of ...
  • Cu-catalyzed N-3-Arylation of Hydantoins Using Diaryliodonium Salts 
    Berntsen, Linn Neerbye; Nova, Ainara; Wragg, David; Sandtorv, Alexander Harald (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    A general Cu-catalyzed, regioselective method for the N-3-arylation of hydantoins is described. The protocol utilizes aryl(trimethoxyphenyl)iodonium tosylate as the arylating agent in the presence of triethylamine and a ...
  • Deactivation of Zeolite Catalyst H-ZSM-5 during Conversion of Methanol to Gasoline: Operando Time- and Space-Resolved X-ray Diffraction 
    Rojo-Gama, Daniel; Mentel, Lukasz; Kalantzopoulos, Georgios N.; Pappas, Dimitrios; Dovgaliuk, Iurii; Olsbye, Unni; Lillerud, Karl Petter; Beato, Pablo; Lundegaard, Lars Fahl; Wragg, David; Svelle, Stian (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    The deactivation of zeolite catalyst H-ZSM-5 by coking during the conversion of methanol to hydrocarbons was monitored by high-energy space- and time-resolved operando X-ray diffraction (XRD) . Space resolution was achieved ...
  • Determination of Molybdenum Species Evolution during Non‐Oxidative Dehydroaromatization of Methane and its Implications for Catalytic Performance 
    Agote-Aran, Miren; Kroner, Anna B; Islam, Husn U; Slawinski, Wojciech Andrzej; Wragg, David; Lezcano-González, Inés; Beale, Andrew M. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Mo/H‐ZSM‐5 has been studied using a combination of operando X‐ray absorption spectroscopy and High Resolution Powder Diffraction in order to study the evolution of Mo species and their location within the zeolite pores. ...
  • Di-μ-chlorido-bis[2,2'-bipyridine-5,5'-dicarboxylic acid-κ2N,N')chloridocopper(II)]dimethylformamide tetrasolvate 
    Øien, Sigurd; Wragg, David; Lillerud, Karl Petter; Tilset, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    This open-access article is distributed under the terms of the Creative Commons Attribution Licence
  • Dimethyl 3,3′-dimethoxybiphenyl-4,4′-dicarboxylate 
    Lundvall, Fredrik; Wragg, David; Dietzel, Pascal D.C.; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    In the title compound, C18H18O6, the biphenyl moiety is twisted with a dihedral angle of 29.11 (10)°. The carbometh­oxy groups form C-C-C-O torsion angles of -18.3 (3) and -27.7 (3)° with the attached rings, as a result ...
  • Insights into Crystal Structure and Diffusion of Biphasic Na2Zn2TeO6 
    Li, Xinyu; Bianchini, Federico; Wind, Julia; Pettersen, Christine; Vajeeston, Ponniah; Wragg, David; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The layered oxide Na2Zn2TeO6 is a fast Na+ ion conductor and a suitable candidate for application as a solid-state electrolyte. We present a detailed study on how synthesis temperature and Na-content affect the crystal ...
  • Methyl 5-iodo-2-methoxybenzoate 
    Lundvall, Fredrik; Wragg, David; Dietzel, Pascal D.C.; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    In the title compound, C9H9IO3, the mol­ecules are close to planar [maximum deviation from benzene ring plane = 0.229 (5) Å for the methyl carboxylate C atom] with the methyl groups oriented away from each other. In the ...
  • Rietveld Analysis of Computed Tomography and its Application to Methanol to Olefin Reactor Beds 
    Wragg, David; Bleken, Francesca Lønstad; O'Brien, Matthew G.; Di Michiel, Marco (Journal article / Tidsskriftartikkel / SubmittedVersion, 2015)
    This article reports the creation of tomographic reconstructions giving three-dimensional data on the distribution of various structural features for SAPO-34 zeolite catalyst beds used in the commercially important methanol ...
  • SAPO-37 microporous catalysts: revealing the structural transformations during template removal 
    Kalantzopoulos, Georgios N.; Lundvall, Fredrik; Lind, Anna Maria; Arstad, Bjørnar; Chernyshov, Dmitry; Fjellvåg, Helmer; Wragg, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    We have studied the structural behavior of SAPO-37 during calcination using simultaneous in situ powder X-ray diffraction (PXRD) and mass spectroscopy (MS) in addition to ex situ thermogravimetric analysis (TGA) and ...
  • Spatial dynamics of lithiation and lithium plating during high-rate operation of graphite electrodes 
    Wragg, David; Finegan, Donal; Quinn, Alexander; Andrew, Colclasure; Xueken, Lu; Tan, Chun; Heenan, Thomas; Jervis, Rhodri; Brett, Dan J L; Das, Supratim; Gao, Tao; Cogswell, Daniel A.; Bazant, Martin; Di Michel, Marco; Checcia, Stefano; Shearing, Paul; Smith, Kandler (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The principal inhibitor of fast charging lithium ion cells is the graphite negative electrode, where favorable conditions for lithium plating occur at high charge rates, causing accelerated degradation and safety concerns. ...
  • A Straightforward Descriptor for the Deactivation of Zeolite Catalyst H-ZSM-5 
    Rojo-Gama, Daniel; Nielsen, Malte; Wragg, David; Dyballa, Michael Martin; Holzinger, Julian; Falsig, Hanne; Lundegaard, Lars Fahl; Beato, Pablo; Brogaard, Rasmus Yding; Lillerud, Karl Petter; Olsbye, Unni; Svelle, Stian (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    ZSM-5 is a widely used zeolite catalyst and is employed industrially for the methanol to gasoline (MTG) process. Even so, deactivation of ZSM-5 by coke formation constitutes a major technical and also fundamental challenge. ...
  • Structural and magnetic characterization of the elusive Jahn-Teller active NaCrF3 
    Bernal, Fabian Leonardo Martinez; Sottmann, Jonas; Wragg, David; Fjellvåg, Helmer; Fjellvåg, Øystein; Drathen, Christina; Slawinski, Wojciech Andrzej; Løvvik, Ole Martin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We report on the structural and magnetic properties of the elusive Jahn-Teller active compound NaCrF3, for first time synthesized in large quantities allowing detailed characterization. The crystal structure of NaCrF3 is ...
  • Synthesis and Evaluation of K-Promoted Co3-xMgxAl-Oxides as Solid CO2 Sorbents in the Sorption-Enhanced Water−Gas Shift (SEWGS) Reaction 
    Arstad, Bjørnar; Blom, Richard; Håkonsen, Silje Fosse; Pierchala, Joanna; Cobden, Paul; Lundvall, Fredrik; Kalantzopoulos, Georgios N.; Wragg, David; Fjellvåg, Helmer; Sjåstad, Anja Olafsen (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Hydrogen is essential in a variety of large-scale chemical processes. As a carbon-free energy carrier, hydrogen has a potential for wide use within power production and transportation. However, most of the recent production ...
  • Thermogravimetric Analysis – A Viable Method for Screening Novel Materials for the Sorbent Enhanced Water-gas Shift Process 
    Lundvall, Fredrik; Kalantzopoulos, Georgios N.; Wragg, David; Arstad, Bjørnar; Blom, Richard; Sjåstad, Anja Olafsen; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Pre-combustion CO2 capture technologies are becoming viable alternatives to more conventional post-combustion capture by gas emissions scrubbing. The sorbent enhanced water-gas shift (SEWGS) process is a promising future ...
  • Understanding the (De)Sodiation Mechanisms in Na‐Based Batteries through Operando X‐Ray Methods 
    Brennhagen, Anders; Cavallo, Carmen; Wragg, David; Sottmann, Jonas; Koposov, Alexey; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Progress in the field of Na‐based batteries strongly relies on the development of new advanced materials. However, one of the main challenges of implementing new electrode materials is the understanding of their mechanisms ...
  • Understanding the Deactivation Phenomena of Small-Pore Mo/H-SSZ-13 during Methane Dehydroaromatisation 
    Agote-Arán, Miren; Kroner, Anna B.; Wragg, David; Slawinski, Wojciech Andrzej; Briceno, Martha; Islam, Husn U.; Sazanovich, Igor V.; Rivas, María E; Smith, Andrew W J; Collier, Paul; Lezcano-González, Inés; Beale, Andrew M. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Small pore zeolites have shown great potential in a number of catalytic reactions. While Mo-containing medium pore zeolites have been widely studied for methane dehydroaromatisation (MDA), the use of small pore supports ...