Karoline Kvande

• Dyballa, Michael Martin; Pappas, Dimitrios; Kvande, Karoline; Borfecchia, Elisa; Arstad, Bjørnar; Beato, Pablo; Olsbye, Unni & Svelle, Stian (2019). On how copper mordenite properties govern the framework stability and activity in the methane-to-methanol conversion. ACS Catalysis.  ISSN 2155-5435.  9(1), s 365- 375 . doi: 10.1021/acscatal.8b04437
• Dyballa, Michael Martin; Thorshaug, Knut; Pappas, Dimitrios; Borfecchia, Elisa; Kvande, Karoline; Bordiga, Silvia; Berlier, Gloria; Lazzarini, Andrea; Olsbye, Unni; Beato, Pablo; Svelle, Stian & Arstad, Bjørnar (2019). Zeolite surface methoxy groups as key intermediates in the stepwise conversion of methane to methanol. ChemCatChem.  ISSN 1867-3880.  11, s 5022- 5026 . doi: 10.1002/cctc.201901315 Vis sammendrag

  This contribution clarifies the overoxidation-preventing key step in the methane-to-methanol (MTM) conversion over copper mordenite zeolites. We followed the methane-to-methanol conversion over copper mordenite zeolites by NMR spectroscopy supported by DRIFTS to show that surface methoxy groups (SMGs) located at zeolite Brønsted sites are the key intermediates. The SMGs with chemical shift of 59 ppm are identical to those formed on a copper-free reference zeolite after reaction with methanol and react with water, methanol, or carbon monoxide to yield methanol, dimethyl ether, and acetate. This reactivity corroborates the location of SMGs at Brønsted sites. We find no evidence for stable SMGs directly at copper sites and explain mechanistically why H-form mordenites outperform their Na-form analogues. This finding is of interest for any future process that tries to trap the intermediate methane oxidation product towards methanol.

• Buono, Carlo; Martini, Andrea; Pankin, Ilya; Pappas, Dimitrios; Negri, Chiara; Kvande, Karoline; Lomachenko, Kirill A. & Borfecchia, Elisa (2018). Local structure of Cu(I) ions in the MOR zeolite: A DFT-assisted XAS study. Radiation Physics and Chemistry.  ISSN 0969-806X. . doi: 10.1016/j.radphyschem.2018.12.031
• Pappas, Dimitrios; Martini, Andrea; Dyballa, Michael Martin; Kvande, Karoline; Teketel, Shewangizaw; Lomachenko, Kirill A.; Baran, Rafal; Glatzel, Pieter; Arstad, Bjørnar; Berlier, Gloria; Lamberti, Carlo; Bordiga, Silvia; Olsbye, Unni; Svelle, Stian; Beato, Pablo & Borfecchia, Elisa (2018). The nuclearity of the active site for methane to methanol conversion in Cu-mordenite: a quantitative assessment. Journal of the American Chemical Society.  ISSN 0002-7863.  140(45), s 15270- 15278 . doi: 10.1021/jacs.8b08071

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• Dyballa, Michael Martin; Pappas, Dimitrios; Borfecchia, Elisa; Kvande, Karoline; Bordiga, Silvia; Berlier, Gloria; Lamberti, Carlo; Arstad, Bjørnar; Beato, Pablo; Olsbye, Unni & Svelle, Stian (2019). Cu-MOR applied in the stepwise methane-to-methanol conversion.
• Kvande, Karoline; Svelle, Stian; Dyballa, Michael Martin & Pappas, Dimitrios (2019). A Study of Cu-loaded SAPO-34 for the Direct Conversion of Methane to Methanol.
• Kvande, Karoline (2017). Direct conversion of methane to methanol.

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