Browsing Kjemisk institutt by Author "Olsbye, Unni"

Now showing items 21-40 of 49

  • Highly selective hydrogenation of CO2 to propane over GaZrO x/H-SSZ-13 composite 
    Wang, Sen; Zhang, Li; Wang, Pengfei; Jiao, Weiyong; Qin, Zhangfeng; Dong, Mei; Wang, Jianguo; Olsbye, Unni; Fan, Weibin (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
    Selective hydrogenation of CO2 into value-added hydrocarbons, particularly single products, is of great interest. However, this is a challenge because of the simultaneous occurrence of numerous competing elementary reactions. ...
  • Hydrogenation of CO2 to Methanol by Pt Nanoparticles Encapsulated in UiO-67: Deciphering the Role of the Metal–Organic Framework 
    Gutterød, Emil Sebastian; Lazzarini, Andrea; Fjermestad, Torstein; Kaur, Gurpreet; Manzoli, Maela; Bordiga, Silvia; Svelle, Stian; Lillerud, Karl Petter; Skúlason, Egill; Øien-Ødegaard, Sigurd; Nova, Ainara; Olsbye, Unni (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Metal–organic frameworks (MOFs) show great prospect as catalysts and catalyst support materials. Yet, studies that address their dynamic, kinetic, and mechanistic role in target reactions are scarce. In this study, an ...
  • Impact of post-synthetic treatments on unidirectional H-ZSM-22 zeolite catalyst: Towards improved clean MTG catalytic process 
    Del Campo, Pablo; Olsbye, Unni; Lillerud, Karl Petter; Svelle, Stian; Beato, Pablo (Journal article / Tidsskriftartikkel / SubmittedVersion, 2018)
    In the present study, a series of H-ZSM-22 mesoporous catalysts resulting from three different desilication treatments (NaOH treatment, treatment using mixtures of NaOH/CTAB and using mixtures of NaOH/TBAOH) and sequential ...
  • Influence of Cu-speciation in mordenite on direct methane to methanol conversion: Multi-Technique characterization and comparison with NH3 selective catalytic reduction of NOx 
    Pappas, Dimitrios; Kvande, Karoline; Kalyva, Maria Evangelou; Dyballa, Michael Martin; Lomachenko, Kirill A.; Arstad, Bjørnar; Borfecchia, Elisa; Bordiga, Silvia; Olsbye, Unni; Beato, Pablo; Svelle, Stian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The direct conversion of methane to methanol has the potential of substantially reducing methane emissions and flaring, as such a process might provide an alternative for remote natural gas locations. In this report, we ...
  • Influence of Defects and H2O on the Hydrogenation of CO2 to Methanol over Pt Nanoparticles in UiO-67 Metal-Organic Framework 
    Gutterød, Emil Sebastian; Pulumati, S.H.; Kaur, Gurpreet; Lazzarini, Andrea; Solemsli, B. G.; Gunnæs, Anette Eleonora; Ahoba-Sam, Christian; Kalyva, Maria Evangelou; Sannes, Johnny Andreas; Svelle, Stian; Skúlason, Egill; Nova, Ainara; Olsbye, Unni (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    In catalysts for CO2 hydrogenation, the interface between metal nanoparticles (NPs) and the support material is of high importance for the activity and reaction selectivity. In Pt NP-containing UiO Zr-metal–organic frameworks ...
  • Low temperature methanol synthesis catalyzed by copper nanoparticles 
    Ahoba-Sam, Christian; Olsbye, Unni; Jens, Klaus-Joachim (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    A one pot catalytic system which involves Cu and an alkoxide co-catalyst has been used for methanol (MeOH) synthesis at low temperature. Up to about 92% syngas conversion per pass and more than 90% selectivity to MeOH (the ...
  • MAPO-18 Catalysts for the Methanol to Olefins Process: Influence of Catalyst Acidity in a High-Pressure Syngas (CO and H2) Environment 
    Xie, Jingxiu; Firth, Daniel Sean; Cordero Lanzac, Tomas; Airi, Alessia; Negri, Chiara; Øien-Ødegaard, Sigurd; Lillerud, Karl Petter; Bordiga, Silvia; Olsbye, Unni (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    The transition from integrated petrochemical complexes toward decentralized chemical plants utilizing distributed feedstocks calls for simpler downstream unit operations. Less separation steps are attractive for future ...
  • Mechanistic Insights in the Catalytic Hydrogenation of CO2 over Pt Nanoparticles in UiO-67 Metal-Organic Frameworks 
    Pulumati, Sri Harsha; Sannes, Dag Kristian; Jabbour, Christia R.; Mandemaker, Laurens D. B.; Weckhuysen, Bert M.; Olsbye, Unni; Nova Flores, Ainara; Skúlason, Egill (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Metal nanoparticles (NPs) encapsulated within Zr-based UiO-67 metal–organic frameworks (MOFs) have increased selectivity toward methanol in CO2 reduction reactions. However, the reduction mechanism in these systems remains ...
  • Methane to methanol: structure-activity relationships for Cu-CHA 
    Pappas, Dimitrios; Borfecchia, Elisa; Dyballa, Michael Martin; Pankin, Ilia A.; Lomachenko, Kirill A.; Martini, Andrea; Signorile, Matteo; Teketel, Shewangizaw; Arstad, Bjørnar; Berlier, Gloria; Lamberti, Carlo; Bordiga, Silvia; Olsbye, Unni; Lillerud, Karl Petter; Svelle, Stian; Beato, Pablo (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    Cu-exchanged zeolites possess active sites that are able to cleave the C–H bond of methane at temperatures ≤200 °C, enabling its selective partial oxidation to methanol. Herein we explore this process over Cu-SSZ-13 ...
  • Modulation of the Thermochemical Stability and Adsorptive Properties of MOF-808 by the Selection of Non-structural Ligands 
    Aunan, Erlend; Affolter, Chris W.; Lillerud, Karl Petter; Olsbye, Unni (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Metal–organic frameworks (MOFs) have been heavily researched due to their porous and crystalline nature. Because of this, MOFs are enticing materials for fields as diverse as gas separation and purification, water harvesting, ...
  • Morphology-induced shape selectivity in zeolite catalysis 
    Teketel, Shewangizaw; Lundegaard, Lars Fahl; Skistad, Wegard; Chavan, Sachin Maruti; Olsbye, Unni; Lillerud, Karl Petter; Beato, Pablo; Svelle, Stian (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2015)
    Zeolites are crystalline aluminosilicates that are widely used as shape-selective catalysts in the refinery and petrochemical industries. By synthesizing a series of structurally related zeolite catalyst and applying them ...
  • On the conversion of CO2 to value added products over composite PdZn and H-ZSM-5 catalysts: excess Zn over Pd, a compromise or a penalty? 
    Ahoba-Sam, Christian; Borfecchia, Elisa; Lazzarini, Andrea; Bugaev, Aram L.; Isah, Abdulrahman Adamu; Taoufik, Mostafa; Bordiga, Silvia; Olsbye, Unni (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    A challenge in converting CO2 into hydrocarbons (HC) via methanol (MeOH) is the gap between the optimal temperature for each step (i.e. ≤250 °C for MeOH and ≥350 °C for HC). The focus of this study is to elucidate the cause ...
  • Operando Laboratory-Based Multi-Edge X-Ray Absorption Near-Edge Spectroscopy of Solid Catalysts 
    Genz, Nina; Kallio, Antti-Jussi; Oord, Ramon; Krumeich, Frank; Pokle, Anuj; Prytz, Øystein; Olsbye, Unni; Meirer, Florian; Huotari, Simo; Weckhuysen, Bert M. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Laboratory-based X-ray absorption spectroscopy (XAS) and especially X-ray absorption near-edge structure (XANES) offers new opportunities in catalyst characterization and presents not only an alternative, but also a ...
  • Parametric sensitivity analysis of the transient adsorption-diffusion models for hydrocarbon transport in microporous materials 
    Shostak, Vladyslav; Redekop, Evgeniy; Olsbye, Unni (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    The complex nature of hydrocarbon transport in microporous materials offers unique challenges for the description of transient kinetic data in catalysis by e.g. acidic zeolites and zeotypes. Currently, very few models in ...
  • Quantification of Linker Defects in UiO-Type Metal-Organic Frameworks 
    Sannes, Dag Kristian; Øien-Ødegaard, Sigurd; Aunan, Erlend; Nova, Ainara; Olsbye, Unni (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Metal–organic frameworks (MOFs) are nanoporous materials composed of organic linkers and inorganic nodes. The large variety of linkers and nodes and the multiple ways to combine them make MOFs highly tunable materials, ...
  • Real-time regeneration of a working zeolite monitored via operando X-ray diffraction and crystallographic imaging: how coke flees the MFI framework 
    Kalantzopoulos, Georgios; Rojo Gama, Daniel; Pappas, Dimitrios; Dovgaliuk, Iurii; Olsbye, Unni; Beato, Pablo; Lundegaard, Lars F.; Wragg, David Stephen; Svelle, Stian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We have monitored the regeneration of H-ZSM-5 via operando time-resolved powder X-Ray diffraction (PXRD) coupled with mass spectroscopy (MS). Parametric Rietveld refinements and calculation of the extra-framework electronic ...
  • Shaping of metal-organic framework UiO-66 using alginates: Effect of operation variables 
    Lee, Daniel W; Didriksen, Terje; Olsbye, Unni; Blom, Richard; Grande, Carlos Adolfo (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Shaping of metal-organic frameworks into macro-structured particles for reactors and separation processes is a fundamental step in their way towards commercialization. Extrusion techniques which are used for shaping many ...
  • 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 Elucidation, Aggregation, and Dynamic Behaviour of N,N,N,N-Copper(I) Schiff Base Complexes in Solid and in Solution: A Combined NMR, X-ray Spectroscopic and Crystallographic Investigation 
    Gerz, Isabelle; Jannuzzi, Sergio Augusto Venturinelli; Hylland, Knut Tormodssønn; Negri, Chiara; Wragg, David Stephen; Øien-Ødegaard, Sigurd; Tilset, Mats; Olsbye, Unni; DeBeer, Serena; Amedjkouh, Mohamed (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    A series of Cu(I) complexes of bidentate or tetradentate Schiff base ligands bearing either 1-H-imidazole or pyridine moieties were synthesized. The complexes were studied by a combination of NMR and X-ray spectroscopic ...
  • Structure-deactivation relationships in zeolites during the methanol–to-hydrocarbons reaction: Complementary assessments of the coke content 
    Rojo-Gama, Daniel; Signorile, Matteo; Bonino, Francesca; Bordiga, Silvia; Olsbye, Unni; Lillerud, Karl Petter; Beato, Pablo; Svelle, Stian (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    Catalyst deactivation during the methanol-to-hydrocarbons (MTH) reaction was investigated using five different commercially prepared microporous catalysts, including Mordenite, ZSM-22, ZSM-5, zeolite Beta and SAPO-34. The ...