BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Memento EPFL// BEGIN:VEVENT SUMMARY:IMX Seminar Series - X-ray Spectroscopy Techniques Probing Active Species in Homogeneous Catalysis DTSTART:20210329T131500 DTEND:20210329T141500 DTSTAMP:20260511T062046Z UID:132634cb1d09031584ed8625c5378e19b01cdf885aaf335eb4c7fc0f CATEGORIES:Conferences - Seminars DESCRIPTION:Prof. Moniek Tromp\, Groningen University\, The Netherlands\nD etailed information on the structural and electronic properties of a catal yst or material and how they change during reaction is required to underst and their reaction mechanism and performance. An experimental technique th at can provide structural as well as electronic analysis and that can be a pplied in situ/operando and in a time-resolved mode\, is X-ray spectroscop y. Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy is powerf ul in determining the local structure of compounds including amorphous mat erials and solutions\, since long-range order is not required. Combined X- ray Absorption and X-ray Emission spectroscopy (XAS and XES resp.) provide s detailed insights in the electronic properties of a material. Detailed i nformation about the materials in their dynamic chemical active environmen t can thus be obtained and structure/electronic – performance relationsh ips and reaction mechanisms derived. Developments in XAS using new instrum entation and data acquisition methods while selecting specific X-ray energ ies provide this more detailed electronic information [1]. High energy res olution XAS\, XES and Resonant Inelastic X-ray Scattering (RIXS) provide v ery detailed electronic information on the systems under investigation. Th e secondary spectrometer design also opens up lab-based spectrometer desig ns as will be demonstrated [2].\nOver the last years\, different approache s have been reported to allow operando time resolved XAS on catalytic syst ems\, mostly solid-gas. Our group has also developed stopped-flow methodol ogies allowing simultaneous time-resolved UV–Vis/XAS experimentation on liquid systems down to the millisecond (ms) time resolution [3]. Low X-ray energy systems (light elements) or for low concentrated systems\, longer XAS data acquisition times in fluorescence detection are required and ther efore a stopped flow freeze-quench procedure has been developed [4]. Pushi ng the time-resolution has been achieved by synchronizing the synchrotron bunches with an optical laser in order to perform fast pump-probe experime nts [6] or applying modulation excitation methodologies\, which can isolat e active from spectator species [6].\nThe methodologies and instrumentatio n have been developed and applied to a wealth of materials science\, for h omogeneous and heterogeneous catalysis to batteries and fuel cells as well as art objects. This lecture will focus on homogeneous catalysis\, provid ing insights in active/activated catalyst species and reaction mechanisms. A range of complementary spectroscopic techniques have for example been a pplied to different selective ethene oligomerisation catalysts\, i.e. indu strially applied chromium-based ones [4] as well as novel iron and nickel- based systems [7]. Solving the complicated puzzles of data\, revealing act ive and inactive catalyst intermediates as a function of time and process conditions\, has led to design concepts for novel catalysts in the field.\ n\n1.         See for example: Angew. Chem. Int. Ed. 45 (2006) 4651 -4654\; J. Phys. Chem. B 110 (2006) 16162-16164\; Angew. Chem. Int. Ed. 47 (2008) 9260-9264\; Catal. Today 145 (2009) 300-306\; J. Phys. Chem. C 117 (2013) 23286–23294\; Chem. Phys. Chem. 8 (2014) 1569–1572\; J. Phys. Chem. C 119 (2015) 2419–2426.\n2.         Coord. Chem. Rev. 423 ( 2020)\, 213466 (28 p.).\n3.         Organometallics 29 (2010) 3085 –3097.\n4.         J. Catal. 285 (2011) 247–258\; ACS Catalysis 4 (2014) 4201\; Catal. Sci. Techn. 6 (2016) 6237\; ACS Catal. 9 (2018) 11 97-1210\; Chem. Cat. Chem. 12 (2020)\, 881-892\; Cat. Sci. Tech. 10 (2020) \, 6212-6222.\n5.         J. Phys. Chem. B 117 (2013) 7381–7387\; Photochem. Photobiol. Sci. 17 (2018) 896-902.\n6.         manuscri pt in preparation.\n7.         Phys. Chem. Chem. Phys. 21 (2019) 14 638-14645\; RSC Advances 10 (2020) 729-738\; Organometallics 39 (2020)\, 3 480-3489.\nBio: Moniek Tromp finished her MSc in Chemistry\, with speciali sations in spectroscopy and catalysis\, at the University of Utrecht (Nld) in 2000. She then obtained a PhD from the same university\, in the fields of homogeneous catalysis and time-resolved X-ray absorption spectroscopy with Profs. Koningsberger and van Koten.  After finishing with distinctio n (‘cum laude’\, greatest honours possible) in 2004\, she moved to the University of Southampton (UK) for a Post-Doctoral Research fellowship in the fields of heterogeneous catalysis and spectroscopy. In 2007\, she was awarded an EPSRC Advanced Research Fellowship to start her own independen t academic career (and became lecturer). She moved to Germany in 2010\, wh ere she took up a position as professor in Catalyst Characterisation at th e Technical University Munich. In 2014\, she decided to come back to the N etherlands\, working at the University of Amsterdam. From July 2018 she ha s taken up the Chair of Materials Chemistry at the Zernike Institute at th e University of Groningen.\nShe has been awarded prestigious fellowships/a wards like the EPSRC Advanced Research Fellowship\, NWO VIDI and the NWO A thena prize. She is active in numerous science advisory and review panels of large research facilities and universities internationally\, part of a European Science Strategy team for large facilities\, has published close to 100 papers in high profile journals and given over 80 invited lectures worldwide.\nShe is chair of the Dutch Catalysis Society (of the KNCV). She is co-chair of the organizing committee of the annual conference on Catal ysis (NCCC) in The Netherlands. Gender and diversity are important for her and she has been active as Gender Equality Officer (D) and is now develop ing programs for primary school on science and engineering as well as gend er bias issues. From April 2019\, she has taken up a board position at the National Network for Female Professors (LNVH). She is a board member of t he Dutch Science Association NWO (division ENW) since May 2019.\nHer resea rch focusses on the development and application of operando spectroscopy t echniques in catalysis and materials research\, incl. fuel cells\, batteri es\, photochemistry\, as well as arts\, with a focus on X-ray spectroscopy techniques. Novel (time resolved) X-ray absorption and emission spectrosc opy methods have been developed as tools in catalysis and energy material (battery and fuel cell) research. This includes the development of the req uired operando instrumentation and cells\, as well as data analysis and th eoretical methods. Application of the techniques to fundamentally or indus trially interesting catalytic processes and materials has been pursued\, p roviding unprecedented insights in properties and mechanisms. LOCATION:https://epfl.zoom.us/j/95940364570 STATUS:CONFIRMED END:VEVENT END:VCALENDAR