Dimitrios Pappas

• 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
• Lomachenko, Kirill A.; Martini, A; Pappas, Dimitrios; Negri, Chiara; Dyballa, Michael Martin; Berlier, Gloria; Bordiga, Silvia; Lamberti, Carlo; Olsbye, Unni; Svelle, Stian; Beato, Pablo & Borfecchia, Elisa (2019). The impact of reaction conditions and material composition on the stepwise methane to methanol conversion over Cu-MOR: An operando XAS study. Catalysis Today.  ISSN 0920-5861.  336, s 99- 108 . doi: 10.1016/j.cattod.2019.01.040
• Pappas, Dimitrios; Borfecchia, Elisa; Lomachenko, Kirill A.; Lazzarini, Andrea; Gutterød, Emil Sebastian; Dyballa, Michael Martin; Martini, Andrea; Berlier, Gloria; Bordiga, Silvia; Lamberti, Carlo; Arstad, Bjørnar; Olsbye, Unni; Beato, Pablo & Svelle, Stian (2019). Cu-Exchanged Ferrierite Zeolite for the Direct CH4 to CH3OH Conversion: Insights on Cu Speciation from X-Ray Absorption Spectroscopy. Topics in catalysis.  ISSN 1022-5528.  62(7-11) . doi: 10.1007/s11244-019-01160-7 Vis sammendrag

  The direct stepwise transformation of CH4 to CH3OH over Cu-exchanged zeolites has been an intensively researched reaction as it can provide a solution for the utilization of this abundant feedstock. Up to date a commercial process is far from realization, which is why an understanding of the Cu speciation in zeolites as a function of reaction conditions as well as the development of a mechanistic view of the reaction are necessary to further advance the field. Herein we study Cu-exchanged ferrierite zeolite for the direct CH4 to CH3OH conversion by utilizing X-ray absorption spectroscopy (XAS), in order to assess the local structure and electronic properties of Cu through the reaction. A Cu-FER sample with a Cu/Al = 0.20 and Si/Al = 11 was subjected to three reaction cycles yielding ultimately 96 µmol CH3OH/gzeolite . Normalized to the Cu loading, this accounts for 0.33 mol CH3OH /molCu, making the sample comparable to very active Cu-MOR materials reported in the literature. During O2 activation, a transient self-reduction regime of CuII to CuI ions was identified; eventually leading to mostly framework interacting CuII species. CH4 loading leads to a reduction of these CuII containing species; which are finally partially reoxidized during H2O-assisted CH3OH extraction. The speciation after CH4 activation as well as H2O-assisted CH3OH extraction was assessed via linear combination fitting analysis of the XAS data.

• Borfecchia, Elisa; Pappas, Dimitrios; Dyballa, Michael Martin; Lomachenko, Kirill A.; Negri, Chiara; Signorile, Matteo & Berlier, Gloria (2018). Evolution of active sites during selective oxidation of methane to methanol over Cu-CHA and Cu-MOR zeolites as monitored by operando XAS. Catalysis Today.  ISSN 0920-5861. . doi: 10.1016/j.cattod.2018.07.028
• 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
• Dyballa, Michael Martin; Pappas, Dimitrios; Borfecchia, Elisa; Beato, Pablo; Olsbye, Unni; Lillerud, Karl Petter; Arstad, Bjørnar & Svelle, Stian (2018). Tuning the material and catalytic properties of SUZ-4 zeolites for the conversion of methanol or methane. Microporous and Mesoporous Materials.  ISSN 1387-1811.  265, s 112- 122 . doi: 10.1016/j.micromeso.2018.02.004
• Pappas, Dimitrios; Borfecchia, Elisa; Dyballa, Michael Martin; Lomachenko, Kirill A.; Martini, Andrea; Berlier, Gloria; Arstad, Bjørnar; Lamberti, Carlo; Bordiga, Silvia; Olsbye, Unni; Svelle, Stian & Beato, Pablo (2018). Understanding and optimizing the performance of Cu‐FER for the direct CH4 to CH3OH conversion. ChemCatChem.  ISSN 1867-3880.  11(1), s 621- 627 . doi: 10.1002/cctc.201801542
• 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
• 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 (2018). Deactivation of Zeolite Catalyst H-ZSM-5 during Conversion of Methanol to Gasoline: Operando Time- and Space-Resolved X-ray Diffraction. The Journal of Physical Chemistry Letters.  ISSN 1948-7185.  9(6), s 1324- 1328 . doi: 10.1021/acs.jpclett.8b00094
• 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 (2017). Methane to methanol: structure-activity relationships for Cu-CHA. Journal of the American Chemical Society.  ISSN 0002-7863.  139(42), s 14961- 14975 . doi: 10.1021/jacs.7b06472 Fulltekst i vitenarkiv.

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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.
• Pappas, Dimitrios (2018). Reducibility of Cu-zeolites: A Descriptor for the Activity in the Methane to Methanol Conversion.
• Pappas, Dimitrios; Borfecchia, Elisa; Berlier, Gloria; Beato, Pablo & Svelle, Stian (2018). Methane to Methanol over Cu-Zeolites: Establishing Structure-Activity Relationships.
• Pappas, Dimitrios; Borfecchia, Elisa; Dyballa, Michael Martin; Berlier, Gloria; Bordiga, Silvia; Olsbye, Unni; Beato, Pablo & Svelle, Stian (2018). FOLLOWING O2-ACTIVATION OF CU-ZEOLITES WITH TIME-RESOLVED XAS.
• Pappas, Dimitrios; Borfecchia, Elisa; Dyballa, Michael Martin; Martini, Andrea; Lomachenko, Kirill A.; Berlier, Gloria; Lamberti, Carlo; Bordiga, Silvia; Olsbye, Unni; Beato, Pablo & Svelle, Stian (2018). Methane to Methanol over Cu-Zeolites: Establishing Structure-Activity Relationships.
• Berlier, Gloria; Borfecchia, Elisa; Negri, C; Bordiga, Silvia; Beato, Pablo; Lomachenko, Kirill A.; Pankin, Ilia; Lamberti, Carlo; Pappas, Dimitrios; Dyballa, Michael Martin; Olsbye, Unni & Svelle, Stian (2017). Comparing small and large pore Cu-zeolites for the partial oxidation of methane to methanol: an operando spectroscopic study.
• Dyballa, Michael Martin; Arstad, Bjørnar; Pappas, Dimitrios; Svelle, Stian; Olsbye, Unni; Beato, Pablo; Bordiga, Silvia & Borfecchia, Elisa (2017). On the preparation of Cu-containing Zeolites - How to avoid comparing Apples to Oranges..
• Pappas, Dimitrios; Borfecchia, Elisa; Dyballa, Michael Martin; Lomachenko, Kirill A.; Signorile, Matteo; Berlier, Gloria; Lamberti, Carlo; Bordiga, Silvia; Olsbye, Unni; Lillerud, Karl Petter; Svelle, Stian & Beato, Pablo (2017). Searching for the Active Sites Responsible for the CH4 to CH3OH Conversion over Cu-Chabazite Materials.
• 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 (2017). XAS reveals structure-activity relationships for the Methane-to-Methanol conversion over Cu-zeolites. ESRF Highlights of the Year.  s 49- 51
• Pappas, Dimitrios; Borfecchia, Elisa; Dyballa, Michael Martin; Pankin, Ilia; Lomachenko, Kirill A.; Berlier, Gloria; Arstad, Bjørnar; Lamberti, Carlo; Bordiga, Silvia; Beato, Pablo; Olsbye, Unni & Svelle, Stian (2017). Key Reaction Steps in the Partial Oxidation of Methane to Methanol over Cu-SSZ-13.

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